Release v4.1.0 (#1867)

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 3.5.0 to 3.6.1.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](https://github.com/docker/setup-buildx-action/compare/v3.5.0...v3.6.1)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.eslintrc.cjs

@@ -20,6 +20,9 @@ module.exports = {
     ecmaVersion: 'latest',
     sourceType: 'module',
   },
+  "globals": {
+    JSX: "readonly"
+  },
   plugins: [
     'react',
     '@typescript-eslint'
@@ -27,6 +30,7 @@ module.exports = {
   rules: {
     'linebreak-style': 0,
     'no-underscore-dangle': 0,
+    "no-shadow": "off",
 
     "import/prefer-default-export": "off",
     "import/extensions": "off",
@@ -55,5 +59,14 @@ module.exports = {
     "react-hooks/exhaustive-deps": "error",
 
     "@typescript-eslint/no-unused-vars": "error",
+    "@typescript-eslint/no-shadow": "error"
   },
+  overrides: [
+    {
+      files: ['*.ts'],
+      rules: {
+        'no-undef': 'off',
+      },
+    },
+  ],
 };

.github/workflows/build-pull-request.yml

@@ -12,20 +12,20 @@ jobs:
       PR_NUMBER: ${{github.event.number}}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3.2.0
+        uses: actions/checkout@v4.1.7
       - name: Setup node
-        uses: actions/setup-node@v3.5.1
+        uses: actions/setup-node@v4.0.3
         with:
-          node-version: 18.12.1
-          cache: "npm"
+          node-version: 20.12.2
+          cache: 'npm'
       - name: Install dependencies
         run: npm ci
       - name: Build app
         env:
-          NODE_OPTIONS: "--max_old_space_size=4096"
+          NODE_OPTIONS: '--max_old_space_size=4096'
         run: npm run build
       - name: Upload artifact
-        uses: actions/upload-artifact@v3.1.1
+        uses: actions/upload-artifact@v4.3.4
         with:
           name: preview
           path: dist
@@ -33,7 +33,7 @@ jobs:
       - name: Save pr number
         run: echo ${PR_NUMBER} > ./pr.txt
       - name: Upload pr number
-        uses: actions/upload-artifact@v3.1.1
+        uses: actions/upload-artifact@v4.3.4
         with:
           name: pr
           path: ./pr.txt

.github/workflows/cla.yml

@@ -12,7 +12,7 @@ jobs:
       - name: 'CLA Assistant'
         if: (github.event.comment.body == 'recheck' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request_target'
         # Beta Release
-        uses: cla-assistant/github-action@v2.2.1
+        uses: cla-assistant/github-action@v2.4.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           # the below token should have repo scope and must be manually added by you in the repository's secret

.github/workflows/deploy-pull-request.yml

@@ -15,7 +15,7 @@ jobs:
     if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
       - name: Download pr number
-        uses: dawidd6/action-download-artifact@e6e25ac3a2b93187502a8be1ef9e9603afc34925
+        uses: dawidd6/action-download-artifact@bf251b5aa9c2f7eeb574a96ee720e24f801b7c11
         with:
           workflow: ${{ github.event.workflow.id }}
           run_id: ${{ github.event.workflow_run.id }}
@@ -24,7 +24,7 @@ jobs:
         id: pr
         run: echo "id=$(<pr.txt)" >> $GITHUB_OUTPUT
       - name: Download artifact
-        uses: dawidd6/action-download-artifact@e6e25ac3a2b93187502a8be1ef9e9603afc34925
+        uses: dawidd6/action-download-artifact@bf251b5aa9c2f7eeb574a96ee720e24f801b7c11
         with:
           workflow: ${{ github.event.workflow.id }}
           run_id: ${{ github.event.workflow_run.id }}
@@ -32,7 +32,7 @@ jobs:
           path: dist
       - name: Deploy to Netlify
         id: netlify
-        uses: nwtgck/actions-netlify@5da65c9f74c7961c5501a3ba329b8d0912f39c03
+        uses: nwtgck/actions-netlify@4cbaf4c08f1a7bfa537d6113472ef4424e4eb654
         with:
           publish-dir: dist
           deploy-message: "Deploy PR ${{ steps.pr.outputs.id }}"
@@ -45,7 +45,7 @@ jobs:
           NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID_PR_CINNY }}
         timeout-minutes: 1
       - name: Comment preview on PR
-        uses: thollander/actions-comment-pull-request@c22fb302208b7b170d252a61a505d2ea27245eff
+        uses: thollander/actions-comment-pull-request@fabd468d3a1a0b97feee5f6b9e499eab0dd903f6
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:

.github/workflows/docker-pr.yml

@@ -11,9 +11,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3.2.0
+        uses: actions/checkout@v4.1.7
       - name: Build Docker image
-        uses: docker/build-push-action@v3.2.0
+        uses: docker/build-push-action@v6.5.0
         with:
           context: .
           push: false

.github/workflows/lockfile.yml

@@ -14,7 +14,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.2.0
+        uses: actions/checkout@v4.1.7
       - name: NPM Lockfile Changes
         uses: codepunkt/npm-lockfile-changes@b40543471c36394409466fdb277a73a0856d7891
         with:

.github/workflows/netlify-dev.yml

@@ -3,7 +3,7 @@ name: Deploy to Netlify (dev)
 on:
   push:
     branches:
-       - dev
+      - dev
 
 jobs:
   deploy-to-netlify:
@@ -11,23 +11,23 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3.2.0
+        uses: actions/checkout@v4.1.7
       - name: Setup node
-        uses: actions/setup-node@v3.5.1
+        uses: actions/setup-node@v4.0.3
         with:
-          node-version: 18.12.1
-          cache: "npm"
+          node-version: 20.12.2
+          cache: 'npm'
       - name: Install dependencies
         run: npm ci
       - name: Build app
         env:
-          NODE_OPTIONS: "--max_old_space_size=4096"
+          NODE_OPTIONS: '--max_old_space_size=4096'
         run: npm run build
       - name: Deploy to Netlify
-        uses: nwtgck/actions-netlify@5da65c9f74c7961c5501a3ba329b8d0912f39c03
+        uses: nwtgck/actions-netlify@4cbaf4c08f1a7bfa537d6113472ef4424e4eb654
         with:
           publish-dir: dist
-          deploy-message: "Dev deploy ${{ github.sha }}"
+          deploy-message: 'Dev deploy ${{ github.sha }}'
           enable-commit-comment: false
           github-token: ${{ secrets.GITHUB_TOKEN }}
           production-deploy: true

.github/workflows/prod-deploy.yml

@@ -10,23 +10,23 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3.2.0
+        uses: actions/checkout@v4.1.7
       - name: Setup node
-        uses: actions/setup-node@v3.5.1
+        uses: actions/setup-node@v4.0.3
         with:
-          node-version: 18.12.1
-          cache: "npm"
+          node-version: 20.12.2
+          cache: 'npm'
       - name: Install dependencies
         run: npm ci
       - name: Build app
         env:
-          NODE_OPTIONS: "--max_old_space_size=4096"
+          NODE_OPTIONS: '--max_old_space_size=4096'
         run: npm run build
       - name: Deploy to Netlify
-        uses: nwtgck/actions-netlify@5da65c9f74c7961c5501a3ba329b8d0912f39c03
+        uses: nwtgck/actions-netlify@4cbaf4c08f1a7bfa537d6113472ef4424e4eb654
         with:
           publish-dir: dist
-          deploy-message: "Prod deploy ${{ github.ref_name }}"
+          deploy-message: 'Prod deploy ${{ github.ref_name }}'
           enable-commit-comment: false
           github-token: ${{ secrets.GITHUB_TOKEN }}
           production-deploy: true
@@ -52,7 +52,7 @@ jobs:
           gpg --export | xxd -p
           echo '${{ secrets.GNUPG_PASSPHRASE }}' | gpg --batch --yes --pinentry-mode loopback --passphrase-fd 0 --armor --detach-sign cinny-${{ steps.vars.outputs.tag }}.tar.gz
       - name: Upload tagged release
-        uses: softprops/action-gh-release@de2c0eb89ae2a093876385947365aca7b0e5f844
+        uses: softprops/action-gh-release@c062e08bd532815e2082a85e87e3ef29c3e6d191
         with:
           files: |
             cinny-${{ steps.vars.outputs.tag }}.tar.gz
@@ -66,31 +66,31 @@ jobs:
       packages: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3.2.0
+        uses: actions/checkout@v4.1.7
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2.1.0
+        uses: docker/setup-qemu-action@v3.2.0
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2.2.1
+        uses: docker/setup-buildx-action@v3.6.1
       - name: Login to Docker Hub
-        uses: docker/login-action@v2.1.0
+        uses: docker/login-action@v3.3.0
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Login to the Container registry
-        uses: docker/login-action@v2.1.0
+        uses: docker/login-action@v3.3.0
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v4.1.1
+        uses: docker/metadata-action@v5.5.1
         with:
           images: |
             ${{ secrets.DOCKER_USERNAME }}/cinny
             ghcr.io/${{ github.repository }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v3.2.0
+        uses: docker/build-push-action@v6.5.0
         with:
           context: .
           platforms: linux/amd64,linux/arm64

.gitignore

@@ -4,3 +4,4 @@ node_modules
 devAssets
 
 .DS_Store
+.idea

Dockerfile

@@ -1,18 +1,20 @@
 ## Builder
-FROM node:18.12.1-alpine3.15 as builder
+FROM node:20.12.2-alpine3.18 as builder
 
 WORKDIR /src
 
 COPY .npmrc package.json package-lock.json /src/
 RUN npm ci
 COPY . /src/
+ENV NODE_OPTIONS=--max_old_space_size=4096
 RUN npm run build
 
 
 ## App
-FROM nginx:1.23.3-alpine
+FROM nginx:1.27.0-alpine
 
 COPY --from=builder /src/dist /app
+COPY --from=builder /src/docker-nginx.conf /etc/nginx/conf.d/default.conf
 
 RUN rm -rf /usr/share/nginx/html \
   && ln -s /app /usr/share/nginx/html

README.md

@@ -13,28 +13,30 @@
 </p>
 
 A Matrix client focusing primarily on simple, elegant and secure interface. The main goal is to have an instant messaging application that is easy on people and has a modern touch.
-- [Roadmap](https://github.com/ajbura/cinny/projects/11)
+- [Roadmap](https://github.com/orgs/cinnyapp/projects/1)
 - [Contributing](./CONTRIBUTING.md)
 
 <img align="center" src="https://raw.githubusercontent.com/cinnyapp/cinny-site/main/assets/preview2-light.png" height="380">
 
 ## Getting started
-Web app is available at https://app.cinny.in and gets updated on each new release. The `dev` branch is continuously deployed at https://dev.cinny.in but keep in mind that it could have things broken.
+* Web app is available at https://app.cinny.in and gets updated on each new release. The `dev` branch is continuously deployed at https://dev.cinny.in but keep in mind that it could have things broken.
 
-You can also download our desktop app from [cinny-desktop repository](https://github.com/cinnyapp/cinny-desktop).
+* You can also download our desktop app from [cinny-desktop repository](https://github.com/cinnyapp/cinny-desktop).
 
-To host Cinny on your own, download tarball of the app from [GitHub release](https://github.com/cinnyapp/cinny/releases/latest).
+* To host Cinny on your own, download tarball of the app from [GitHub release](https://github.com/cinnyapp/cinny/releases/latest).
 You can serve the application with a webserver of your choice by simply copying `dist/` directory to the webroot. 
-To set default Homeserver on login and register page, place a customized [`config.json`](config.json) in webroot of your choice.
+To set default Homeserver on login, register and Explore Community page, place a customized [`config.json`](config.json) in webroot of your choice.
+You will also need to setup redirects to serve the assests. An example setting of redirects for netlify is done in [`netlify.toml`](netlify.toml). You can also set `hashRouter.enabled = true` in [`config.json`](config.json) if you have trouble setting redirects.
+To deploy on subdirectory, you need to rebuild the app youself after updating the `base` path in [`build.config.ts`](build.config.ts). For example, if you want to deploy on `https://cinny.in/app`, then change `base: '/app'`.
 
-Alternatively you can just pull the [DockerHub image](https://hub.docker.com/r/ajbura/cinny) by:
-```
-docker pull ajbura/cinny
-```
-or [ghcr image](https://github.com/cinnyapp/cinny/pkgs/container/cinny) by:
-```
-docker pull ghcr.io/cinnyapp/cinny:latest
-```
+* Alternatively you can just pull the [DockerHub image](https://hub.docker.com/r/ajbura/cinny) by:
+    ```
+    docker pull ajbura/cinny
+    ```
+    or [ghcr image](https://github.com/cinnyapp/cinny/pkgs/container/cinny) by:
+    ```
+    docker pull ghcr.io/cinnyapp/cinny:latest
+    ```
 
 <details>
 <summary>PGP Public Key to verify tarball</summary>
@@ -51,16 +53,16 @@ Frn9ttCEzV55Y+so4X2e4ZnB+5gOnNw+ecifGVdj/+UyWnqvqqDvLrEjjK890nLb
 Pil4siecNMEpiwAN6WSmKpWaCwQAHEGDVeZCc/kT0iYfj5FBcsTVqWiO6eaxkUlm
 jnulqWqRrlB8CJQQvih/g//uSEBdzIibo+ro+3Jpe120U/XVUH62i9HoRQEm6ADG
 4zS5hIq4xyA8fL8AEQEAAbQdQ2lubnlBcHAgPGNpbm55YXBwQGdtYWlsLmNvbT6J
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-CQgHAgYVCgkICwIEFgIDAQIeAQIXgAAKCRCUMwx6UK/M88ApC/9HAdbum1lYBC0s
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-Rhv9VuHO6nR30EEp7IDthftotl5S4lio3+W0pKk4TAKV8vjaCNp3y/lAHzoP1BU9
-bUSao+7GXVeArKBjuqxN+t1uuiaxPH4L0oe2pMVjTig04zGJM5fTVoly859MEcC/
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-eBO5GcHB4VxvloRBNf9/Lr7YOTgWejMUw+MlhZE2RE8unfW1LnM/cjL4dhXzO/XB
-FUHHNq8d6d4e02rfWqw7mZo2/NVJgFRcvzw2rgx7w7CKtCNwF4lNjUetB2waZzDb
-fAE0kwhK4Iuwvy12JOBzL0Yy9MxANtwUryr/LQz9AmdT4Rwnp0S5AY0EYnD+DQEM
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+AZGoRCL3EKEuY8nt3D99fpf3DvZrs1uoVAhiyn737hRlZAg+QsJheeGCmdSJ0hX5
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+K8Xv52BFng7ta9fgsl1XuOjpuaSbQv6g+4ONk/lxKF0SmnhEGM3dmIYPONxW47Yf
+atnIjRra/YhPTNwrNBGMmG4IFKaOsMbjW/eakjWTWOVKKJNBMoDdRcYYWIMCpLy8
+AQUrMtQEsHSnqCwrw818S5A6rrhcfVGk36RGm0nOy6LS5g5jmqaYsvbCcBGY9B2c
+SUAVNm17oo7TtEajk8hcSXoZod1t++pyjcVKEmSn3nFK7v5m3V+cPhNTxZMK459P
+3x1Ucqj/kTqrxKw6s2Uknuk0ajmw0ljV+BQwgL6maguo9BKgCNW5AY0EYnD+DQEM
 ANOu/d6ZMF8bW+Df9RDCUQKytbaZfa+ZbIHBus7whCD/SQMOhPKntv3HX7SmMCs+
 5i27kJMu4YN623JCS7hdCoXVO1R5kXCEcneW/rPBMDutaM472YvIWMIqK9Wwl5+0
 Piu2N+uTkKhe9uS2u7eN+Khef3d7xfjGRxoppM+xI9dZO+jhYiy8LuC0oBohTjJq
@@ -69,24 +71,24 @@ s1+eh00n/tVpi2Jj9pCm7S0csSXvXj8v2OTdK1jt4YjpzR0/rwh4+/xlOjDjZEqH
 vMPhpzpbgnwkxZ3X8BFne9dJ3maC5zQ3LAeCP5m1W0hXzagYhfyjo74slJgD1O8c
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-UeGsouhyuITLwEhScounZDqop+Dx
-=Zg+6
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+mxFo+ioe/ABCufSmyqFye0psX3Sp
+=WtqZ
 -----END PGP PUBLIC KEY BLOCK-----
 ```
 </details>
 
 ## Local development
 > We recommend using a version manager as versions change very quickly. You will likely need to switch 
-between multiple Node.js versions based on the needs of different projects you're working on. [NVM on windows](https://github.com/coreybutler/nvm-windows#installation--upgrades) on Windows and [nvm](https://github.com/nvm-sh/nvm) on Linux/macOS are pretty good choices. Also recommended nodejs version Hydrogen LTS (v18).
+between multiple Node.js versions based on the needs of different projects you're working on. [NVM on windows](https://github.com/coreybutler/nvm-windows#installation--upgrades) on Windows and [nvm](https://github.com/nvm-sh/nvm) on Linux/macOS are pretty good choices. Recommended nodejs version is Iron LTS (v20).
 
 Execute the following commands to start a development server:
 ```sh

_redirects

@@ -1,3 +0,0 @@
-# Redirects from what the browser requests to what we serve
-/login       /
-/register    /

build.config.ts

@@ -0,0 +1,3 @@
+export default {
+  base: '/',
+};

config.json

@@ -1,11 +1,38 @@
 {
-  "defaultHomeserver": 3,
+  "defaultHomeserver": 2,
   "homeserverList": [
     "converser.eu",
     "envs.net",
-    "halogen.city",
     "matrix.org",
-    "mozilla.org"
+    "monero.social",
+    "mozilla.org",
+    "xmr.se"
   ],
-  "allowCustomHomeservers": true
+  "allowCustomHomeservers": true,
+
+  "featuredCommunities": {
+    "openAsDefault": false,
+    "spaces": [
+      "#cinny-space:matrix.org",
+      "#community:matrix.org",
+      "#space:envs.net",
+      "#science-space:matrix.org",
+      "#libregaming-games:tchncs.de",
+      "#mathematics-on:matrix.org"
+    ],
+    "rooms": [
+      "#cinny:matrix.org",
+      "#freesoftware:matrix.org",
+      "#pcapdroid:matrix.org",
+      "#gentoo:matrix.org",
+      "#PrivSec.dev:arcticfoxes.net",
+      "#disroot:aria-net.org"
+    ],
+    "servers": ["envs.net", "matrix.org", "monero.social", "mozilla.org"]
+  },
+
+  "hashRouter": {
+    "enabled": false,
+    "basename": "/"
+  }
 }

contrib/nginx/cinny.domain.tld.conf

@@ -19,9 +19,16 @@ server {
 
 	location / {
 		root /opt/cinny/dist/;
-		index index.html;
-	}
-	location ~* ^\/(login|register) {
-		try_files $uri $uri/ /index.html;
+
+		rewrite ^/config.json$ /config.json break;
+    rewrite ^/manifest.json$ /manifest.json break;
+
+    rewrite ^.*/olm.wasm$ /olm.wasm break;
+    rewrite ^/pdf.worker.min.js$ /pdf.worker.min.js break;
+
+    rewrite ^/public/(.*)$ /public/$1 break;
+    rewrite ^/assets/(.*)$ /assets/$1 break;
+
+    rewrite ^(.+)$ /index.html break;
 	}
 }

docker-nginx.conf

@@ -0,0 +1,16 @@
+server {
+  location / {
+		root /usr/share/nginx/html;
+
+		rewrite ^/config.json$ /config.json break;
+    rewrite ^/manifest.json$ /manifest.json break;
+
+    rewrite ^.*/olm.wasm$ /olm.wasm break;
+    rewrite ^/pdf.worker.min.js$ /pdf.worker.min.js break;
+
+    rewrite ^/public/(.*)$ /public/$1 break;
+    rewrite ^/assets/(.*)$ /assets/$1 break;
+
+    rewrite ^(.+)$ /index.html break;
+	}
+}

index.html

@@ -3,7 +3,7 @@
   <head>
     <meta charset="UTF-8" />
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
     <title>Cinny</title>
     <meta name="name" content="Cinny" />
     <meta name="author" content="Ajay Bura" />
@@ -27,7 +27,7 @@
 
     <link id="favicon" rel="shortcut icon" href="./public/favicon.ico" />
 
-    <link rel="manifest" href="./manifest.json" />
+    <link rel="manifest" href="/manifest.json" />
     <meta name="mobile-web-app-capable" content="yes" />
     <meta name="application-name" content="Cinny" />
     <meta name="apple-mobile-web-app-title" content="Cinny" />
@@ -90,12 +90,6 @@
       window.global ||= window;
     </script>
     <div id="root"></div>
-    <audio id="notificationSound">
-      <source src="./public/sound/notification.ogg" type="audio/ogg" />
-    </audio>
-    <audio id="inviteSound">
-      <source src="./public/sound/invite.ogg" type="audio/ogg" />
-    </audio>
-    <script type="module" src="./src/index.jsx"></script>
+    <script type="module" src="./src/index.tsx"></script>
   </body>
 </html>

netlify.toml

@@ -0,0 +1,36 @@
+[[redirects]]
+  from = "/config.json"
+  to = "/config.json"
+  status = 200
+
+[[redirects]]
+  from = "/manifest.json"
+  to = "/manifest.json"
+  status = 200
+  
+[[redirects]]
+  from = "*/olm.wasm"
+  to = "/olm.wasm"
+  status = 200
+  force = true
+  
+[[redirects]]
+  from = "/pdf.worker.min.js"
+  to = "/pdf.worker.min.js"
+  status = 200
+
+[[redirects]]
+  from = "/public/*"
+  to = "/public/:splat"
+  status = 200
+
+[[redirects]]
+  from = "/assets/*"
+  to = "/assets/:splat"
+  status = 200
+
+[[redirects]]
+  from = "/*"
+  to = "/index.html"
+  status = 200
+  force = true

package.json

@@ -1,8 +1,9 @@
 {
   "name": "cinny",
-  "version": "2.2.5",
+  "version": "4.1.0",
   "description": "Yet another matrix client",
   "main": "index.js",
+  "type": "module",
   "engines": {
     "node": ">=16.0.0"
   },
@@ -19,59 +20,89 @@
   "author": "Ajay Bura",
   "license": "AGPL-3.0-only",
   "dependencies": {
+    "@atlaskit/pragmatic-drag-and-drop": "1.1.6",
+    "@atlaskit/pragmatic-drag-and-drop-auto-scroll": "1.3.0",
+    "@atlaskit/pragmatic-drag-and-drop-hitbox": "1.0.3",
     "@fontsource/inter": "4.5.14",
-    "@fontsource/roboto": "4.5.8",
-    "@khanacademy/simple-markdown": "0.8.6",
     "@matrix-org/olm": "3.2.14",
+    "@tanstack/react-query": "5.24.1",
+    "@tanstack/react-query-devtools": "5.24.1",
+    "@tanstack/react-virtual": "3.2.0",
     "@tippyjs/react": "4.2.6",
+    "@vanilla-extract/css": "1.9.3",
+    "@vanilla-extract/recipes": "0.3.0",
+    "@vanilla-extract/vite-plugin": "3.7.1",
+    "await-to-js": "3.0.0",
     "blurhash": "2.0.4",
     "browser-encrypt-attachment": "0.3.0",
+    "classnames": "2.3.2",
     "dateformat": "5.0.3",
+    "dayjs": "1.11.10",
+    "domhandler": "5.0.3",
+    "emojibase": "6.1.0",
     "emojibase-data": "7.0.1",
     "file-saver": "2.0.5",
     "flux": "4.0.3",
-    "formik": "2.2.9",
-    "html-react-parser": "3.0.4",
-    "katex": "0.16.4",
-    "linkify-html": "4.0.2",
-    "linkifyjs": "4.0.2",
-    "matrix-js-sdk": "24.0.0",
+    "focus-trap-react": "10.0.2",
+    "folds": "2.0.0",
+    "formik": "2.4.6",
+    "html-dom-parser": "4.0.0",
+    "html-react-parser": "4.2.0",
+    "immer": "9.0.16",
+    "is-hotkey": "0.2.0",
+    "jotai": "2.6.0",
+    "linkify-react": "4.1.3",
+    "linkifyjs": "4.1.3",
+    "matrix-js-sdk": "29.1.0",
+    "millify": "6.1.0",
+    "pdfjs-dist": "4.2.67",
+    "prismjs": "1.29.0",
     "prop-types": "15.8.1",
-    "react": "17.0.2",
+    "react": "18.2.0",
+    "react-aria": "3.29.1",
     "react-autosize-textarea": "7.1.0",
     "react-blurhash": "0.2.0",
-    "react-dnd": "15.1.2",
-    "react-dnd-html5-backend": "15.1.3",
-    "react-dom": "17.0.2",
+    "react-dom": "18.2.0",
+    "react-error-boundary": "4.0.13",
     "react-google-recaptcha": "2.1.0",
     "react-modal": "3.16.1",
-    "sanitize-html": "2.8.0",
+    "react-range": "1.8.14",
+    "react-router-dom": "6.20.0",
+    "sanitize-html": "2.12.1",
+    "slate": "0.94.1",
+    "slate-history": "0.93.0",
+    "slate-react": "0.98.4",
     "tippy.js": "6.3.7",
-    "twemoji": "14.0.2"
+    "ua-parser-js": "1.0.35"
   },
   "devDependencies": {
     "@esbuild-plugins/node-globals-polyfill": "0.2.3",
     "@rollup/plugin-inject": "5.0.3",
     "@rollup/plugin-wasm": "6.1.1",
+    "@types/file-saver": "2.0.5",
     "@types/node": "18.11.18",
-    "@types/react": "18.0.26",
-    "@types/react-dom": "18.0.9",
+    "@types/prismjs": "1.26.0",
+    "@types/react": "18.2.39",
+    "@types/react-dom": "18.2.17",
+    "@types/react-google-recaptcha": "2.1.8",
+    "@types/sanitize-html": "2.9.0",
+    "@types/ua-parser-js": "0.7.36",
     "@typescript-eslint/eslint-plugin": "5.46.1",
     "@typescript-eslint/parser": "5.46.1",
-    "@vitejs/plugin-react": "3.0.0",
+    "@vitejs/plugin-react": "4.2.0",
     "buffer": "6.0.3",
     "eslint": "8.29.0",
     "eslint-config-airbnb": "19.0.4",
     "eslint-config-prettier": "8.5.0",
-    "eslint-plugin-import": "2.26.0",
+    "eslint-plugin-import": "2.29.1",
     "eslint-plugin-jsx-a11y": "6.6.1",
     "eslint-plugin-react": "7.31.11",
     "eslint-plugin-react-hooks": "4.6.0",
-    "mini-svg-data-uri": "1.4.4",
     "prettier": "2.8.1",
     "sass": "1.56.2",
     "typescript": "4.9.4",
-    "vite": "4.0.1",
-    "vite-plugin-static-copy": "0.13.0"
+    "vite": "5.0.13",
+    "vite-plugin-static-copy": "1.0.4",
+    "vite-plugin-top-level-await": "1.4.1"
   }
 }

public/manifest.json

@@ -6,52 +6,52 @@
   "lang": "en-US",
   "display": "standalone",
   "orientation": "portrait",
-  "start_url": "/",
+  "start_url": "./",
   "background_color": "#fff",
   "theme_color": "#fff",
   "icons": [
     {
-      "src": "/public/android/android-chrome-36x36.png",
+      "src": "./public/android/android-chrome-36x36.png",
       "sizes": "36x36",
       "type": "image/png"
     },
     {
-      "src": "/public/android/android-chrome-48x48.png",
+      "src": "./public/android/android-chrome-48x48.png",
       "sizes": "48x48",
       "type": "image/png"
     },
     {
-      "src": "/public/android/android-chrome-72x72.png",
+      "src": "./public/android/android-chrome-72x72.png",
       "sizes": "72x72",
       "type": "image/png"
     },
     {
-      "src": "/public/android/android-chrome-96x96.png",
+      "src": "./public/android/android-chrome-96x96.png",
       "sizes": "96x96",
       "type": "image/png"
     },
     {
-      "src": "/public/android/android-chrome-144x144.png",
+      "src": "./public/android/android-chrome-144x144.png",
       "sizes": "144x144",
       "type": "image/png"
     },
     {
-      "src": "/public/android/android-chrome-192x192.png",
+      "src": "./public/android/android-chrome-192x192.png",
       "sizes": "192x192",
       "type": "image/png"
     },
     {
-      "src": "/public/android/android-chrome-256x256.png",
+      "src": "./public/android/android-chrome-256x256.png",
       "sizes": "256x256",
       "type": "image/png"
     },
     {
-      "src": "/public/android/android-chrome-384x384.png",
+      "src": "./public/android/android-chrome-384x384.png",
       "sizes": "384x384",
       "type": "image/png"
     },
     {
-      "src": "/public/android/android-chrome-512x512.png",
+      "src": "./public/android/android-chrome-512x512.png",
       "sizes": "512x512",
       "type": "image/png"
     }

src/app/atoms/avatar/Avatar.jsx

@@ -2,17 +2,13 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import './Avatar.scss';
 
-import { twemojify } from '../../../util/twemojify';
-
 import Text from '../text/Text';
 import RawIcon from '../system-icons/RawIcon';
 
 import ImageBrokenSVG from '../../../../public/res/svg/image-broken.svg';
 import { avatarInitials } from '../../../util/common';
 
-const Avatar = React.forwardRef(({
-  text, bgColor, iconSrc, iconColor, imageSrc, size,
-}, ref) => {
+const Avatar = React.forwardRef(({ text, bgColor, iconSrc, iconColor, imageSrc, size }, ref) => {
   let textSize = 's1';
   if (size === 'large') textSize = 'h1';
   if (size === 'small') textSize = 'b1';
@@ -20,34 +16,34 @@ const Avatar = React.forwardRef(({
 
   return (
     <div ref={ref} className={`avatar-container avatar-container__${size} noselect`}>
-      {
-        imageSrc !== null
-          ? (
-            <img
-              draggable="false"
-              src={imageSrc}
-              onLoad={(e) => { e.target.style.backgroundColor = 'transparent'; }}
-              onError={(e) => { e.target.src = ImageBrokenSVG; }}
-              alt=""
-            />
-          )
-          : (
-            <span
-              style={{ backgroundColor: iconSrc === null ? bgColor : 'transparent' }}
-              className={`avatar__border${iconSrc !== null ? '--active' : ''}`}
-            >
-              {
-                iconSrc !== null
-                  ? <RawIcon size={size} src={iconSrc} color={iconColor} />
-                  : text !== null && (
-                    <Text variant={textSize} primary>
-                      {twemojify(avatarInitials(text))}
-                    </Text>
-                  )
-              }
-            </span>
-          )
-      }
+      {imageSrc !== null ? (
+        <img
+          draggable="false"
+          src={imageSrc}
+          onLoad={(e) => {
+            e.target.style.backgroundColor = 'transparent';
+          }}
+          onError={(e) => {
+            e.target.src = ImageBrokenSVG;
+          }}
+          alt=""
+        />
+      ) : (
+        <span
+          style={{ backgroundColor: iconSrc === null ? bgColor : 'transparent' }}
+          className={`avatar__border${iconSrc !== null ? '--active' : ''}`}
+        >
+          {iconSrc !== null ? (
+            <RawIcon size={size} src={iconSrc} color={iconColor} />
+          ) : (
+            text !== null && (
+              <Text variant={textSize} primary>
+                {avatarInitials(text)}
+              </Text>
+            )
+          )}
+        </span>
+      )}
     </div>
   );
 });

src/app/atoms/button/Toggle.scss

@@ -22,8 +22,7 @@
     height: 16px;
     background-color: var(--tc-surface-low);
     border-radius: calc(var(--bo-radius) / 2);
-    transition: transform 200ms ease-in-out,
-      opacity 200ms ease-in-out;
+    transition: transform 200ms ease-in-out, opacity 200ms ease-in-out;
     opacity: 0.6;
   }
 
@@ -36,8 +35,8 @@
       @include dir.prop(transform, var(--ltr), var(--rtl));
 
       transform: translateX(calc(125%));
-      background-color: white;
+      background-color: var(--bg-surface);
       opacity: 1;
     }
   }
-}
+}

src/app/atoms/math/Math.jsx

@@ -1,33 +0,0 @@
-import React, { useEffect, useRef } from 'react';
-import PropTypes from 'prop-types';
-import './Math.scss';
-
-import katex from 'katex';
-import 'katex/dist/katex.min.css';
-
-import 'katex/dist/contrib/copy-tex';
-
-const Math = React.memo(({
-  content, throwOnError, errorColor, displayMode,
-}) => {
-  const ref = useRef(null);
-
-  useEffect(() => {
-    katex.render(content, ref.current, { throwOnError, errorColor, displayMode });
-  }, [content, throwOnError, errorColor, displayMode]);
-
-  return <span ref={ref} />;
-});
-Math.defaultProps = {
-  throwOnError: null,
-  errorColor: null,
-  displayMode: null,
-};
-Math.propTypes = {
-  content: PropTypes.string.isRequired,
-  throwOnError: PropTypes.bool,
-  errorColor: PropTypes.string,
-  displayMode: PropTypes.bool,
-};
-
-export default Math;

src/app/atoms/math/Math.scss

@@ -1,3 +0,0 @@
-.katex-display {
-  margin: 0 !important;
-}

src/app/atoms/tabs/Tabs.jsx

@@ -41,8 +41,9 @@ TabItem.propTypes = {
 function Tabs({ items, defaultSelected, onSelect }) {
   const [selectedItem, setSelectedItem] = useState(items[defaultSelected]);
 
-  const handleTabSelection = (item, index) => {
+  const handleTabSelection = (item, index, target) => {
     if (selectedItem === item) return;
+    target.scrollIntoView({ behavior: 'smooth', block: 'nearest', inline: 'center' });
     setSelectedItem(item);
     onSelect(item, index);
   };
@@ -57,7 +58,7 @@ function Tabs({ items, defaultSelected, onSelect }) {
               selected={selectedItem.text === item.text}
               iconSrc={item.iconSrc}
               disabled={item.disabled}
-              onClick={() => handleTabSelection(item, index)}
+              onClick={(e) => handleTabSelection(item, index, e.currentTarget)}
             >
               {item.text}
             </TabItem>

src/app/components/AuthFlowsLoader.tsx

@@ -0,0 +1,64 @@
+import { ReactNode, useCallback, useEffect, useMemo } from 'react';
+import { MatrixError, createClient } from 'matrix-js-sdk';
+import { AsyncStatus, useAsyncCallback } from '../hooks/useAsyncCallback';
+import { useAutoDiscoveryInfo } from '../hooks/useAutoDiscoveryInfo';
+import { promiseFulfilledResult, promiseRejectedResult } from '../utils/common';
+import {
+  AuthFlows,
+  RegisterFlowStatus,
+  RegisterFlowsResponse,
+  parseRegisterErrResp,
+} from '../hooks/useAuthFlows';
+
+type AuthFlowsLoaderProps = {
+  fallback?: () => ReactNode;
+  error?: (err: unknown) => ReactNode;
+  children: (authFlows: AuthFlows) => ReactNode;
+};
+export function AuthFlowsLoader({ fallback, error, children }: AuthFlowsLoaderProps) {
+  const autoDiscoveryInfo = useAutoDiscoveryInfo();
+  const baseUrl = autoDiscoveryInfo['m.homeserver'].base_url;
+
+  const mx = useMemo(() => createClient({ baseUrl }), [baseUrl]);
+
+  const [state, load] = useAsyncCallback(
+    useCallback(async () => {
+      const result = await Promise.allSettled([mx.loginFlows(), mx.registerRequest({})]);
+      const loginFlows = promiseFulfilledResult(result[0]);
+      const registerResp = promiseRejectedResult(result[1]) as MatrixError | undefined;
+      let registerFlows: RegisterFlowsResponse = { status: RegisterFlowStatus.InvalidRequest };
+
+      if (typeof registerResp === 'object' && registerResp.httpStatus) {
+        registerFlows = parseRegisterErrResp(registerResp);
+      }
+
+      if (!loginFlows) {
+        throw new Error('Missing auth flow!');
+      }
+      if ('errcode' in loginFlows) {
+        throw new Error('Failed to load auth flow!');
+      }
+
+      const authFlows: AuthFlows = {
+        loginFlows,
+        registerFlows,
+      };
+
+      return authFlows;
+    }, [mx])
+  );
+
+  useEffect(() => {
+    load();
+  }, [load]);
+
+  if (state.status === AsyncStatus.Idle || state.status === AsyncStatus.Loading) {
+    return fallback?.();
+  }
+
+  if (state.status === AsyncStatus.Error) {
+    return error?.(state.error);
+  }
+
+  return children(state.data);
+}

src/app/components/BackRouteHandler.tsx

@@ -0,0 +1,86 @@
+import { ReactNode, useCallback } from 'react';
+import { matchPath, useLocation, useNavigate } from 'react-router-dom';
+import {
+  getDirectPath,
+  getExplorePath,
+  getHomePath,
+  getInboxPath,
+  getSpacePath,
+} from '../pages/pathUtils';
+import { DIRECT_PATH, EXPLORE_PATH, HOME_PATH, INBOX_PATH, SPACE_PATH } from '../pages/paths';
+
+type BackRouteHandlerProps = {
+  children: (onBack: () => void) => ReactNode;
+};
+export function BackRouteHandler({ children }: BackRouteHandlerProps) {
+  const navigate = useNavigate();
+  const location = useLocation();
+
+  const goBack = useCallback(() => {
+    if (
+      matchPath(
+        {
+          path: HOME_PATH,
+          caseSensitive: true,
+          end: false,
+        },
+        location.pathname
+      )
+    ) {
+      navigate(getHomePath());
+      return;
+    }
+    if (
+      matchPath(
+        {
+          path: DIRECT_PATH,
+          caseSensitive: true,
+          end: false,
+        },
+        location.pathname
+      )
+    ) {
+      navigate(getDirectPath());
+      return;
+    }
+    const spaceMatch = matchPath(
+      {
+        path: SPACE_PATH,
+        caseSensitive: true,
+        end: false,
+      },
+      location.pathname
+    );
+    if (spaceMatch?.params.spaceIdOrAlias) {
+      navigate(getSpacePath(spaceMatch.params.spaceIdOrAlias));
+      return;
+    }
+    if (
+      matchPath(
+        {
+          path: EXPLORE_PATH,
+          caseSensitive: true,
+          end: false,
+        },
+        location.pathname
+      )
+    ) {
+      navigate(getExplorePath());
+      return;
+    }
+    if (
+      matchPath(
+        {
+          path: INBOX_PATH,
+          caseSensitive: true,
+          end: false,
+        },
+        location.pathname
+      )
+    ) {
+      navigate(getInboxPath());
+    }
+  }, [navigate, location]);
+
+  return children(goBack);
+}

src/app/components/CapabilitiesAndMediaConfigLoader.tsx

@@ -0,0 +1,36 @@
+import { ReactNode, useCallback, useEffect } from 'react';
+import { Capabilities } from 'matrix-js-sdk';
+import { AsyncStatus, useAsyncCallback } from '../hooks/useAsyncCallback';
+import { useMatrixClient } from '../hooks/useMatrixClient';
+import { MediaConfig } from '../hooks/useMediaConfig';
+import { promiseFulfilledResult } from '../utils/common';
+
+type CapabilitiesAndMediaConfigLoaderProps = {
+  children: (capabilities?: Capabilities, mediaConfig?: MediaConfig) => ReactNode;
+};
+export function CapabilitiesAndMediaConfigLoader({
+  children,
+}: CapabilitiesAndMediaConfigLoaderProps) {
+  const mx = useMatrixClient();
+
+  const [state, load] = useAsyncCallback<
+    [Capabilities | undefined, MediaConfig | undefined],
+    unknown,
+    []
+  >(
+    useCallback(async () => {
+      const result = await Promise.allSettled([mx.getCapabilities(true), mx.getMediaConfig()]);
+      const capabilities = promiseFulfilledResult(result[0]);
+      const mediaConfig = promiseFulfilledResult(result[1]);
+      return [capabilities, mediaConfig];
+    }, [mx])
+  );
+
+  useEffect(() => {
+    load();
+  }, [load]);
+
+  const [capabilities, mediaConfig] =
+    state.status === AsyncStatus.Success ? state.data : [undefined, undefined];
+  return children(capabilities, mediaConfig);
+}

src/app/components/CapabilitiesLoader.tsx

@@ -0,0 +1,19 @@
+import { ReactNode, useCallback, useEffect } from 'react';
+import { Capabilities } from 'matrix-js-sdk';
+import { AsyncStatus, useAsyncCallback } from '../hooks/useAsyncCallback';
+import { useMatrixClient } from '../hooks/useMatrixClient';
+
+type CapabilitiesLoaderProps = {
+  children: (capabilities: Capabilities | undefined) => ReactNode;
+};
+export function CapabilitiesLoader({ children }: CapabilitiesLoaderProps) {
+  const mx = useMatrixClient();
+
+  const [state, load] = useAsyncCallback(useCallback(() => mx.getCapabilities(true), [mx]));
+
+  useEffect(() => {
+    load();
+  }, [load]);
+
+  return children(state.status === AsyncStatus.Success ? state.data : undefined);
+}

src/app/components/ClientConfigLoader.tsx

@@ -0,0 +1,38 @@
+import { ReactNode, useCallback, useEffect, useState } from 'react';
+import { AsyncStatus, useAsyncCallback } from '../hooks/useAsyncCallback';
+import { ClientConfig } from '../hooks/useClientConfig';
+import { trimTrailingSlash } from '../utils/common';
+
+const getClientConfig = async (): Promise<ClientConfig> => {
+  const url = `${trimTrailingSlash(import.meta.env.BASE_URL)}/config.json`;
+  const config = await fetch(url, { method: 'GET' });
+  return config.json();
+};
+
+type ClientConfigLoaderProps = {
+  fallback?: () => ReactNode;
+  error?: (err: unknown, retry: () => void, ignore: () => void) => ReactNode;
+  children: (config: ClientConfig) => ReactNode;
+};
+export function ClientConfigLoader({ fallback, error, children }: ClientConfigLoaderProps) {
+  const [state, load] = useAsyncCallback(getClientConfig);
+  const [ignoreError, setIgnoreError] = useState(false);
+
+  const ignoreCallback = useCallback(() => setIgnoreError(true), []);
+
+  useEffect(() => {
+    load();
+  }, [load]);
+
+  if (state.status === AsyncStatus.Idle || state.status === AsyncStatus.Loading) {
+    return fallback?.();
+  }
+
+  if (!ignoreError && state.status === AsyncStatus.Error) {
+    return error?.(state.error, load, ignoreCallback);
+  }
+
+  const config: ClientConfig = state.status === AsyncStatus.Success ? state.data : {};
+
+  return children(config);
+}

src/app/components/ConfirmPasswordMatch.tsx

@@ -0,0 +1,35 @@
+import { ReactNode, RefObject, useCallback, useRef, useState } from 'react';
+import { useDebounce } from '../hooks/useDebounce';
+
+type ConfirmPasswordMatchProps = {
+  initialValue: boolean;
+  children: (
+    match: boolean,
+    doMatch: () => void,
+    passRef: RefObject<HTMLInputElement>,
+    confPassRef: RefObject<HTMLInputElement>
+  ) => ReactNode;
+};
+export function ConfirmPasswordMatch({ initialValue, children }: ConfirmPasswordMatchProps) {
+  const [match, setMatch] = useState(initialValue);
+  const passRef = useRef<HTMLInputElement>(null);
+  const confPassRef = useRef<HTMLInputElement>(null);
+
+  const doMatch = useDebounce(
+    useCallback(() => {
+      const pass = passRef.current?.value;
+      const confPass = confPassRef.current?.value;
+      if (!confPass) {
+        setMatch(initialValue);
+        return;
+      }
+      setMatch(pass === confPass);
+    }, [initialValue]),
+    {
+      wait: 500,
+      immediate: false,
+    }
+  );
+
+  return children(match, doMatch, passRef, confPassRef);
+}

src/app/components/MediaConfigLoader.tsx

@@ -0,0 +1,19 @@
+import { ReactNode, useCallback, useEffect } from 'react';
+import { AsyncStatus, useAsyncCallback } from '../hooks/useAsyncCallback';
+import { useMatrixClient } from '../hooks/useMatrixClient';
+import { MediaConfig } from '../hooks/useMediaConfig';
+
+type MediaConfigLoaderProps = {
+  children: (mediaConfig: MediaConfig | undefined) => ReactNode;
+};
+export function MediaConfigLoader({ children }: MediaConfigLoaderProps) {
+  const mx = useMatrixClient();
+
+  const [state, load] = useAsyncCallback(useCallback(() => mx.getMediaConfig(), [mx]));
+
+  useEffect(() => {
+    load();
+  }, [load]);
+
+  return children(state.status === AsyncStatus.Success ? state.data : undefined);
+}

src/app/components/Pdf-viewer/PdfViewer.css.ts

@@ -0,0 +1,37 @@
+import { style } from '@vanilla-extract/css';
+import { DefaultReset, color, config } from 'folds';
+
+export const PdfViewer = style([
+  DefaultReset,
+  {
+    height: '100%',
+  },
+]);
+
+export const PdfViewerHeader = style([
+  DefaultReset,
+  {
+    paddingLeft: config.space.S200,
+    paddingRight: config.space.S200,
+    borderBottomWidth: config.borderWidth.B300,
+    flexShrink: 0,
+    gap: config.space.S200,
+  },
+]);
+export const PdfViewerFooter = style([
+  PdfViewerHeader,
+  {
+    borderTopWidth: config.borderWidth.B300,
+    borderBottomWidth: 0,
+  },
+]);
+
+export const PdfViewerContent = style([
+  DefaultReset,
+  {
+    margin: 'auto',
+    display: 'inline-block',
+    backgroundColor: color.Surface.Container,
+    color: color.Surface.OnContainer,
+  },
+]);

src/app/components/Pdf-viewer/PdfViewer.tsx

@@ -0,0 +1,261 @@
+/* eslint-disable no-param-reassign */
+/* eslint-disable jsx-a11y/no-noninteractive-element-interactions */
+import React, { FormEventHandler, MouseEventHandler, useEffect, useRef, useState } from 'react';
+import classNames from 'classnames';
+import {
+  Box,
+  Button,
+  Chip,
+  Header,
+  Icon,
+  IconButton,
+  Icons,
+  Input,
+  Menu,
+  PopOut,
+  RectCords,
+  Scroll,
+  Spinner,
+  Text,
+  as,
+  config,
+} from 'folds';
+import FocusTrap from 'focus-trap-react';
+import FileSaver from 'file-saver';
+import * as css from './PdfViewer.css';
+import { AsyncStatus } from '../../hooks/useAsyncCallback';
+import { useZoom } from '../../hooks/useZoom';
+import { createPage, usePdfDocumentLoader, usePdfJSLoader } from '../../plugins/pdfjs-dist';
+import { stopPropagation } from '../../utils/keyboard';
+
+export type PdfViewerProps = {
+  name: string;
+  src: string;
+  requestClose: () => void;
+};
+
+export const PdfViewer = as<'div', PdfViewerProps>(
+  ({ className, name, src, requestClose, ...props }, ref) => {
+    const containerRef = useRef<HTMLDivElement>(null);
+    const scrollRef = useRef<HTMLDivElement>(null);
+    const { zoom, zoomIn, zoomOut, setZoom } = useZoom(0.2);
+
+    const [pdfJSState, loadPdfJS] = usePdfJSLoader();
+    const [docState, loadPdfDocument] = usePdfDocumentLoader(
+      pdfJSState.status === AsyncStatus.Success ? pdfJSState.data : undefined,
+      src
+    );
+    const isLoading =
+      pdfJSState.status === AsyncStatus.Loading || docState.status === AsyncStatus.Loading;
+    const isError =
+      pdfJSState.status === AsyncStatus.Error || docState.status === AsyncStatus.Error;
+    const [pageNo, setPageNo] = useState(1);
+    const [jumpAnchor, setJumpAnchor] = useState<RectCords>();
+
+    useEffect(() => {
+      loadPdfJS();
+    }, [loadPdfJS]);
+    useEffect(() => {
+      if (pdfJSState.status === AsyncStatus.Success) {
+        loadPdfDocument();
+      }
+    }, [pdfJSState, loadPdfDocument]);
+
+    useEffect(() => {
+      if (docState.status === AsyncStatus.Success) {
+        const doc = docState.data;
+        if (pageNo < 0 || pageNo > doc.numPages) return;
+        createPage(doc, pageNo, { scale: zoom }).then((canvas) => {
+          const container = containerRef.current;
+          if (!container) return;
+          container.textContent = '';
+          container.append(canvas);
+          scrollRef.current?.scrollTo({
+            top: 0,
+          });
+        });
+      }
+    }, [docState, pageNo, zoom]);
+
+    const handleDownload = () => {
+      FileSaver.saveAs(src, name);
+    };
+
+    const handleJumpSubmit: FormEventHandler<HTMLFormElement> = (evt) => {
+      evt.preventDefault();
+      if (docState.status !== AsyncStatus.Success) return;
+      const jumpInput = evt.currentTarget.jumpInput as HTMLInputElement;
+      if (!jumpInput) return;
+      const jumpTo = parseInt(jumpInput.value, 10);
+      setPageNo(Math.max(1, Math.min(docState.data.numPages, jumpTo)));
+      setJumpAnchor(undefined);
+    };
+
+    const handlePrevPage = () => {
+      setPageNo((n) => Math.max(n - 1, 1));
+    };
+
+    const handleNextPage = () => {
+      if (docState.status !== AsyncStatus.Success) return;
+      setPageNo((n) => Math.min(n + 1, docState.data.numPages));
+    };
+
+    const handleOpenJump: MouseEventHandler<HTMLButtonElement> = (evt) => {
+      setJumpAnchor(evt.currentTarget.getBoundingClientRect());
+    };
+
+    return (
+      <Box className={classNames(css.PdfViewer, className)} direction="Column" {...props} ref={ref}>
+        <Header className={css.PdfViewerHeader} size="400">
+          <Box grow="Yes" alignItems="Center" gap="200">
+            <IconButton size="300" radii="300" onClick={requestClose}>
+              <Icon size="50" src={Icons.ArrowLeft} />
+            </IconButton>
+            <Text size="T300" truncate>
+              {name}
+            </Text>
+          </Box>
+          <Box shrink="No" alignItems="Center" gap="200">
+            <IconButton
+              variant={zoom < 1 ? 'Success' : 'SurfaceVariant'}
+              outlined={zoom < 1}
+              size="300"
+              radii="Pill"
+              onClick={zoomOut}
+              aria-label="Zoom Out"
+            >
+              <Icon size="50" src={Icons.Minus} />
+            </IconButton>
+            <Chip variant="SurfaceVariant" radii="Pill" onClick={() => setZoom(zoom === 1 ? 2 : 1)}>
+              <Text size="B300">{Math.round(zoom * 100)}%</Text>
+            </Chip>
+            <IconButton
+              variant={zoom > 1 ? 'Success' : 'SurfaceVariant'}
+              outlined={zoom > 1}
+              size="300"
+              radii="Pill"
+              onClick={zoomIn}
+              aria-label="Zoom In"
+            >
+              <Icon size="50" src={Icons.Plus} />
+            </IconButton>
+            <Chip
+              variant="Primary"
+              onClick={handleDownload}
+              radii="300"
+              before={<Icon size="50" src={Icons.Download} />}
+            >
+              <Text size="B300">Download</Text>
+            </Chip>
+          </Box>
+        </Header>
+        <Box direction="Column" grow="Yes" alignItems="Center" justifyContent="Center" gap="200">
+          {isLoading && <Spinner variant="Secondary" size="600" />}
+          {isError && (
+            <>
+              <Text>Failed to load PDF</Text>
+              <Button
+                variant="Critical"
+                fill="Soft"
+                size="300"
+                radii="300"
+                before={<Icon src={Icons.Warning} size="50" />}
+                onClick={loadPdfJS}
+              >
+                <Text size="B300">Retry</Text>
+              </Button>
+            </>
+          )}
+          {docState.status === AsyncStatus.Success && (
+            <Scroll
+              ref={scrollRef}
+              size="300"
+              direction="Both"
+              variant="Surface"
+              visibility="Hover"
+            >
+              <Box>
+                <div className={css.PdfViewerContent} ref={containerRef} />
+              </Box>
+            </Scroll>
+          )}
+        </Box>
+        {docState.status === AsyncStatus.Success && (
+          <Header as="footer" className={css.PdfViewerFooter} size="400">
+            <Chip
+              variant="Secondary"
+              radii="300"
+              before={<Icon size="50" src={Icons.ChevronLeft} />}
+              onClick={handlePrevPage}
+              aria-disabled={pageNo <= 1}
+            >
+              <Text size="B300">Previous</Text>
+            </Chip>
+            <Box grow="Yes" justifyContent="Center" alignItems="Center" gap="200">
+              <PopOut
+                anchor={jumpAnchor}
+                align="Center"
+                position="Top"
+                content={
+                  <FocusTrap
+                    focusTrapOptions={{
+                      initialFocus: false,
+                      onDeactivate: () => setJumpAnchor(undefined),
+                      clickOutsideDeactivates: true,
+                      escapeDeactivates: stopPropagation,
+                    }}
+                  >
+                    <Menu variant="Surface">
+                      <Box
+                        as="form"
+                        onSubmit={handleJumpSubmit}
+                        style={{ padding: config.space.S200 }}
+                        direction="Column"
+                        gap="200"
+                      >
+                        <Input
+                          name="jumpInput"
+                          size="300"
+                          variant="Background"
+                          defaultValue={pageNo}
+                          min={1}
+                          max={docState.data.numPages}
+                          step={1}
+                          outlined
+                          type="number"
+                          radii="300"
+                          aria-label="Page Number"
+                        />
+                        <Button type="submit" size="300" variant="Primary" radii="300">
+                          <Text size="B300">Jump To Page</Text>
+                        </Button>
+                      </Box>
+                    </Menu>
+                  </FocusTrap>
+                }
+              >
+                <Chip
+                  onClick={handleOpenJump}
+                  variant="SurfaceVariant"
+                  radii="300"
+                  aria-pressed={jumpAnchor !== undefined}
+                >
+                  <Text size="B300">{`${pageNo}/${docState.data.numPages}`}</Text>
+                </Chip>
+              </PopOut>
+            </Box>
+            <Chip
+              variant="Primary"
+              radii="300"
+              after={<Icon size="50" src={Icons.ChevronRight} />}
+              onClick={handleNextPage}
+              aria-disabled={pageNo >= docState.data.numPages}
+            >
+              <Text size="B300">Next</Text>
+            </Chip>
+          </Header>
+        )}
+      </Box>
+    );
+  }
+);

src/app/components/Pdf-viewer/index.ts

@@ -0,0 +1 @@
+export * from './PdfViewer';

src/app/components/RenderMessageContent.tsx

@@ -0,0 +1,234 @@
+import React from 'react';
+import { MsgType } from 'matrix-js-sdk';
+import { HTMLReactParserOptions } from 'html-react-parser';
+import { Opts } from 'linkifyjs';
+import {
+  AudioContent,
+  DownloadFile,
+  FileContent,
+  ImageContent,
+  MAudio,
+  MBadEncrypted,
+  MEmote,
+  MFile,
+  MImage,
+  MLocation,
+  MNotice,
+  MText,
+  MVideo,
+  ReadPdfFile,
+  ReadTextFile,
+  RenderBody,
+  ThumbnailContent,
+  UnsupportedContent,
+  VideoContent,
+} from './message';
+import { UrlPreviewCard, UrlPreviewHolder } from './url-preview';
+import { Image, MediaControl, Video } from './media';
+import { ImageViewer } from './image-viewer';
+import { PdfViewer } from './Pdf-viewer';
+import { TextViewer } from './text-viewer';
+import { testMatrixTo } from '../plugins/matrix-to';
+
+type RenderMessageContentProps = {
+  displayName: string;
+  msgType: string;
+  ts: number;
+  edited?: boolean;
+  getContent: <T>() => T;
+  mediaAutoLoad?: boolean;
+  urlPreview?: boolean;
+  highlightRegex?: RegExp;
+  htmlReactParserOptions: HTMLReactParserOptions;
+  linkifyOpts: Opts;
+  outlineAttachment?: boolean;
+};
+export function RenderMessageContent({
+  displayName,
+  msgType,
+  ts,
+  edited,
+  getContent,
+  mediaAutoLoad,
+  urlPreview,
+  highlightRegex,
+  htmlReactParserOptions,
+  linkifyOpts,
+  outlineAttachment,
+}: RenderMessageContentProps) {
+  const renderUrlsPreview = (urls: string[]) => {
+    const filteredUrls = urls.filter((url) => !testMatrixTo(url));
+    if (filteredUrls.length === 0) return undefined;
+    return (
+      <UrlPreviewHolder>
+        {filteredUrls.map((url) => (
+          <UrlPreviewCard key={url} url={url} ts={ts} />
+        ))}
+      </UrlPreviewHolder>
+    );
+  };
+
+  const renderFile = () => (
+    <MFile
+      content={getContent()}
+      renderFileContent={({ body, mimeType, info, encInfo, url }) => (
+        <FileContent
+          body={body}
+          mimeType={mimeType}
+          renderAsPdfFile={() => (
+            <ReadPdfFile
+              body={body}
+              mimeType={mimeType}
+              url={url}
+              encInfo={encInfo}
+              renderViewer={(p) => <PdfViewer {...p} />}
+            />
+          )}
+          renderAsTextFile={() => (
+            <ReadTextFile
+              body={body}
+              mimeType={mimeType}
+              url={url}
+              encInfo={encInfo}
+              renderViewer={(p) => <TextViewer {...p} />}
+            />
+          )}
+        >
+          <DownloadFile body={body} mimeType={mimeType} url={url} encInfo={encInfo} info={info} />
+        </FileContent>
+      )}
+      outlined={outlineAttachment}
+    />
+  );
+
+  if (msgType === MsgType.Text) {
+    return (
+      <MText
+        edited={edited}
+        content={getContent()}
+        renderBody={(props) => (
+          <RenderBody
+            {...props}
+            highlightRegex={highlightRegex}
+            htmlReactParserOptions={htmlReactParserOptions}
+            linkifyOpts={linkifyOpts}
+          />
+        )}
+        renderUrlsPreview={urlPreview ? renderUrlsPreview : undefined}
+      />
+    );
+  }
+
+  if (msgType === MsgType.Emote) {
+    return (
+      <MEmote
+        displayName={displayName}
+        edited={edited}
+        content={getContent()}
+        renderBody={(props) => (
+          <RenderBody
+            {...props}
+            highlightRegex={highlightRegex}
+            htmlReactParserOptions={htmlReactParserOptions}
+            linkifyOpts={linkifyOpts}
+          />
+        )}
+        renderUrlsPreview={urlPreview ? renderUrlsPreview : undefined}
+      />
+    );
+  }
+
+  if (msgType === MsgType.Notice) {
+    return (
+      <MNotice
+        edited={edited}
+        content={getContent()}
+        renderBody={(props) => (
+          <RenderBody
+            {...props}
+            highlightRegex={highlightRegex}
+            htmlReactParserOptions={htmlReactParserOptions}
+            linkifyOpts={linkifyOpts}
+          />
+        )}
+        renderUrlsPreview={urlPreview ? renderUrlsPreview : undefined}
+      />
+    );
+  }
+
+  if (msgType === MsgType.Image) {
+    return (
+      <MImage
+        content={getContent()}
+        renderImageContent={(props) => (
+          <ImageContent
+            {...props}
+            autoPlay={mediaAutoLoad}
+            renderImage={(p) => <Image {...p} loading="lazy" />}
+            renderViewer={(p) => <ImageViewer {...p} />}
+          />
+        )}
+        outlined={outlineAttachment}
+      />
+    );
+  }
+
+  if (msgType === MsgType.Video) {
+    return (
+      <MVideo
+        content={getContent()}
+        renderAsFile={renderFile}
+        renderVideoContent={({ body, info, mimeType, url, encInfo }) => (
+          <VideoContent
+            body={body}
+            info={info}
+            mimeType={mimeType}
+            url={url}
+            encInfo={encInfo}
+            renderThumbnail={
+              mediaAutoLoad
+                ? () => (
+                    <ThumbnailContent
+                      info={info}
+                      renderImage={(src) => (
+                        <Image alt={body} title={body} src={src} loading="lazy" />
+                      )}
+                    />
+                  )
+                : undefined
+            }
+            renderVideo={(p) => <Video {...p} />}
+          />
+        )}
+        outlined={outlineAttachment}
+      />
+    );
+  }
+
+  if (msgType === MsgType.Audio) {
+    return (
+      <MAudio
+        content={getContent()}
+        renderAsFile={renderFile}
+        renderAudioContent={(props) => (
+          <AudioContent {...props} renderMediaControl={(p) => <MediaControl {...p} />} />
+        )}
+        outlined={outlineAttachment}
+      />
+    );
+  }
+
+  if (msgType === MsgType.File) {
+    return renderFile();
+  }
+
+  if (msgType === MsgType.Location) {
+    return <MLocation content={getContent()} />;
+  }
+
+  if (msgType === 'm.bad.encrypted') {
+    return <MBadEncrypted />;
+  }
+
+  return <UnsupportedContent />;
+}

src/app/components/RoomSummaryLoader.tsx

@@ -0,0 +1,90 @@
+import { ReactNode, useCallback, useState } from 'react';
+import { MatrixClient, Room } from 'matrix-js-sdk';
+import { useQuery } from '@tanstack/react-query';
+import { IHierarchyRoom } from 'matrix-js-sdk/lib/@types/spaces';
+import { useMatrixClient } from '../hooks/useMatrixClient';
+import { LocalRoomSummary, useLocalRoomSummary } from '../hooks/useLocalRoomSummary';
+import { AsyncState, AsyncStatus } from '../hooks/useAsyncCallback';
+
+export type IRoomSummary = Awaited<ReturnType<MatrixClient['getRoomSummary']>>;
+
+type RoomSummaryLoaderProps = {
+  roomIdOrAlias: string;
+  children: (roomSummary?: IRoomSummary) => ReactNode;
+};
+
+export function RoomSummaryLoader({ roomIdOrAlias, children }: RoomSummaryLoaderProps) {
+  const mx = useMatrixClient();
+
+  const fetchSummary = useCallback(() => mx.getRoomSummary(roomIdOrAlias), [mx, roomIdOrAlias]);
+
+  const { data } = useQuery({
+    queryKey: [roomIdOrAlias, `summary`],
+    queryFn: fetchSummary,
+  });
+
+  return children(data);
+}
+
+export function LocalRoomSummaryLoader({
+  room,
+  children,
+}: {
+  room: Room;
+  children: (roomSummary: LocalRoomSummary) => ReactNode;
+}) {
+  const summary = useLocalRoomSummary(room);
+
+  return children(summary);
+}
+
+export function HierarchyRoomSummaryLoader({
+  roomId,
+  children,
+}: {
+  roomId: string;
+  children: (state: AsyncState<IHierarchyRoom, Error>) => ReactNode;
+}) {
+  const mx = useMatrixClient();
+
+  const fetchSummary = useCallback(() => mx.getRoomHierarchy(roomId, 1, 1), [mx, roomId]);
+  const [errorMemo, setError] = useState<Error>();
+
+  const { data, error } = useQuery({
+    queryKey: [roomId, `hierarchy`],
+    queryFn: fetchSummary,
+    retryOnMount: false,
+    refetchOnWindowFocus: false,
+    retry: (failureCount, err) => {
+      setError(err);
+      if (failureCount > 3) return false;
+      return true;
+    },
+  });
+
+  let state: AsyncState<IHierarchyRoom, Error> = {
+    status: AsyncStatus.Loading,
+  };
+  if (error) {
+    state = {
+      status: AsyncStatus.Error,
+      error,
+    };
+  }
+  if (errorMemo) {
+    state = {
+      status: AsyncStatus.Error,
+      error: errorMemo,
+    };
+  }
+
+  const summary = data?.rooms[0] ?? undefined;
+  if (summary) {
+    state = {
+      status: AsyncStatus.Success,
+      data: summary,
+    };
+  }
+
+  return children(state);
+}

src/app/components/RoomUnreadProvider.tsx

@@ -0,0 +1,24 @@
+import { ReactElement } from 'react';
+import { Unread } from '../../types/matrix/room';
+import { useRoomUnread, useRoomsUnread } from '../state/hooks/unread';
+import { roomToUnreadAtom } from '../state/room/roomToUnread';
+
+type RoomUnreadProviderProps = {
+  roomId: string;
+  children: (unread?: Unread) => ReactElement;
+};
+export function RoomUnreadProvider({ roomId, children }: RoomUnreadProviderProps) {
+  const unread = useRoomUnread(roomId, roomToUnreadAtom);
+
+  return children(unread);
+}
+
+type RoomsUnreadProviderProps = {
+  rooms: string[];
+  children: (unread?: Unread) => ReactElement;
+};
+export function RoomsUnreadProvider({ rooms, children }: RoomsUnreadProviderProps) {
+  const unread = useRoomsUnread(rooms, roomToUnreadAtom);
+
+  return children(unread);
+}

src/app/components/SpaceChildDirectsProvider.tsx

@@ -0,0 +1,28 @@
+import { ReactNode } from 'react';
+import { RoomToParents } from '../../types/matrix/room';
+import { useMatrixClient } from '../hooks/useMatrixClient';
+import { allRoomsAtom } from '../state/room-list/roomList';
+import { useChildDirectScopeFactory, useSpaceChildren } from '../state/hooks/roomList';
+
+type SpaceChildDirectsProviderProps = {
+  spaceId: string;
+  mDirects: Set<string>;
+  roomToParents: RoomToParents;
+  children: (rooms: string[]) => ReactNode;
+};
+export function SpaceChildDirectsProvider({
+  spaceId,
+  roomToParents,
+  mDirects,
+  children,
+}: SpaceChildDirectsProviderProps) {
+  const mx = useMatrixClient();
+
+  const childDirects = useSpaceChildren(
+    allRoomsAtom,
+    spaceId,
+    useChildDirectScopeFactory(mx, mDirects, roomToParents)
+  );
+
+  return children(childDirects);
+}

src/app/components/SpaceChildRoomsProvider.tsx

@@ -0,0 +1,28 @@
+import { ReactNode } from 'react';
+import { RoomToParents } from '../../types/matrix/room';
+import { useMatrixClient } from '../hooks/useMatrixClient';
+import { allRoomsAtom } from '../state/room-list/roomList';
+import { useChildRoomScopeFactory, useSpaceChildren } from '../state/hooks/roomList';
+
+type SpaceChildRoomsProviderProps = {
+  spaceId: string;
+  mDirects: Set<string>;
+  roomToParents: RoomToParents;
+  children: (rooms: string[]) => ReactNode;
+};
+export function SpaceChildRoomsProvider({
+  spaceId,
+  roomToParents,
+  mDirects,
+  children,
+}: SpaceChildRoomsProviderProps) {
+  const mx = useMatrixClient();
+
+  const childRooms = useSpaceChildren(
+    allRoomsAtom,
+    spaceId,
+    useChildRoomScopeFactory(mx, mDirects, roomToParents)
+  );
+
+  return children(childRooms);
+}

src/app/components/SpecVersionsLoader.tsx

@@ -0,0 +1,43 @@
+import { ReactNode, useCallback, useEffect, useState } from 'react';
+import { AsyncStatus, useAsyncCallback } from '../hooks/useAsyncCallback';
+import { SpecVersions, specVersions } from '../cs-api';
+
+type SpecVersionsLoaderProps = {
+  baseUrl: string;
+  fallback?: () => ReactNode;
+  error?: (err: unknown, retry: () => void, ignore: () => void) => ReactNode;
+  children: (versions: SpecVersions) => ReactNode;
+};
+export function SpecVersionsLoader({
+  baseUrl,
+  fallback,
+  error,
+  children,
+}: SpecVersionsLoaderProps) {
+  const [state, load] = useAsyncCallback(
+    useCallback(() => specVersions(fetch, baseUrl), [baseUrl])
+  );
+  const [ignoreError, setIgnoreError] = useState(false);
+
+  const ignoreCallback = useCallback(() => setIgnoreError(true), []);
+
+  useEffect(() => {
+    load();
+  }, [load]);
+
+  if (state.status === AsyncStatus.Idle || state.status === AsyncStatus.Loading) {
+    return fallback?.();
+  }
+
+  if (!ignoreError && state.status === AsyncStatus.Error) {
+    return error?.(state.error, load, ignoreCallback);
+  }
+
+  return children(
+    state.status === AsyncStatus.Success
+      ? state.data
+      : {
+          versions: [],
+        }
+  );
+}

src/app/components/SupportedUIAFlowsLoader.tsx

@@ -0,0 +1,17 @@
+import { ReactNode } from 'react';
+import { UIAFlow } from 'matrix-js-sdk';
+import { useSupportedUIAFlows } from '../hooks/useUIAFlows';
+
+export function SupportedUIAFlowsLoader({
+  flows,
+  supportedStages,
+  children,
+}: {
+  supportedStages: string[];
+  flows: UIAFlow[];
+  children: (supportedFlows: UIAFlow[]) => ReactNode;
+}) {
+  const supportedFlows = useSupportedUIAFlows(flows, supportedStages);
+
+  return children(supportedFlows);
+}

src/app/components/UIAFlowOverlay.tsx

@@ -0,0 +1,73 @@
+import React, { ReactNode } from 'react';
+import {
+  Overlay,
+  OverlayBackdrop,
+  Box,
+  config,
+  Text,
+  TooltipProvider,
+  Tooltip,
+  Icons,
+  Icon,
+  Chip,
+  IconButton,
+} from 'folds';
+import FocusTrap from 'focus-trap-react';
+import { stopPropagation } from '../utils/keyboard';
+
+export type UIAFlowOverlayProps = {
+  currentStep: number;
+  stepCount: number;
+  children: ReactNode;
+  onCancel: () => void;
+};
+export function UIAFlowOverlay({
+  currentStep,
+  stepCount,
+  children,
+  onCancel,
+}: UIAFlowOverlayProps) {
+  return (
+    <Overlay open backdrop={<OverlayBackdrop />}>
+      <FocusTrap focusTrapOptions={{ initialFocus: false, escapeDeactivates: stopPropagation }}>
+        <Box style={{ height: '100%' }} direction="Column" grow="Yes" gap="400">
+          <Box grow="Yes" direction="Column" alignItems="Center" justifyContent="Center">
+            {children}
+          </Box>
+          <Box
+            style={{ padding: config.space.S200 }}
+            shrink="No"
+            justifyContent="Center"
+            alignItems="Center"
+            gap="200"
+          >
+            <Chip as="div" radii="Pill" outlined>
+              <Text as="span" size="T300">{`Step ${currentStep}/${stepCount}`}</Text>
+            </Chip>
+            <TooltipProvider
+              tooltip={
+                <Tooltip variant="Critical">
+                  <Text>Exit</Text>
+                </Tooltip>
+              }
+              position="Top"
+            >
+              {(anchorRef) => (
+                <IconButton
+                  ref={anchorRef}
+                  variant="Critical"
+                  size="300"
+                  onClick={onCancel}
+                  radii="Pill"
+                  outlined
+                >
+                  <Icon size="50" src={Icons.Cross} />
+                </IconButton>
+              )}
+            </TooltipProvider>
+          </Box>
+        </Box>
+      </FocusTrap>
+    </Overlay>
+  );
+}

src/app/components/UseStateProvider.tsx

@@ -0,0 +1,9 @@
+import { Dispatch, ReactElement, SetStateAction, useState } from 'react';
+
+type UseStateProviderProps<T> = {
+  initial: T | (() => T);
+  children: (value: T, setter: Dispatch<SetStateAction<T>>) => ReactElement;
+};
+export function UseStateProvider<T>({ initial, children }: UseStateProviderProps<T>) {
+  return children(...useState(initial));
+}

src/app/components/editor/Editor.css.ts

@@ -0,0 +1,72 @@
+import { style } from '@vanilla-extract/css';
+import { color, config, DefaultReset, toRem } from 'folds';
+
+export const Editor = style([
+  DefaultReset,
+  {
+    backgroundColor: color.SurfaceVariant.Container,
+    color: color.SurfaceVariant.OnContainer,
+    boxShadow: `inset 0 0 0 ${config.borderWidth.B300} ${color.SurfaceVariant.ContainerLine}`,
+    borderRadius: config.radii.R400,
+    overflow: 'hidden',
+  },
+]);
+
+export const EditorOptions = style([
+  DefaultReset,
+  {
+    padding: config.space.S200,
+  },
+]);
+
+export const EditorTextareaScroll = style({});
+
+export const EditorTextarea = style([
+  DefaultReset,
+  {
+    flexGrow: 1,
+    height: '100%',
+    padding: `${toRem(13)} ${toRem(1)}`,
+    selectors: {
+      [`${EditorTextareaScroll}:first-child &`]: {
+        paddingLeft: toRem(13),
+      },
+      [`${EditorTextareaScroll}:last-child &`]: {
+        paddingRight: toRem(13),
+      },
+      '&:focus': {
+        outline: 'none',
+      },
+    },
+  },
+]);
+
+export const EditorPlaceholder = style([
+  DefaultReset,
+  {
+    position: 'absolute',
+    zIndex: 1,
+    width: '100%',
+    opacity: config.opacity.Placeholder,
+    pointerEvents: 'none',
+    userSelect: 'none',
+
+    selectors: {
+      '&:not(:first-child)': {
+        display: 'none',
+      },
+    },
+  },
+]);
+
+export const EditorToolbarBase = style({
+  padding: `0 ${config.borderWidth.B300}`,
+});
+
+export const EditorToolbar = style({
+  padding: config.space.S100,
+});
+
+export const MarkdownBtnBox = style({
+  paddingRight: config.space.S100,
+});

src/app/components/editor/Editor.preview.tsx

@@ -0,0 +1,84 @@
+import React, { useState } from 'react';
+import FocusTrap from 'focus-trap-react';
+import {
+  config,
+  Icon,
+  IconButton,
+  Icons,
+  Line,
+  Modal,
+  Overlay,
+  OverlayBackdrop,
+  OverlayCenter,
+} from 'folds';
+
+import { CustomEditor, useEditor } from './Editor';
+import { Toolbar } from './Toolbar';
+import { stopPropagation } from '../../utils/keyboard';
+
+export function EditorPreview() {
+  const [open, setOpen] = useState(false);
+  const editor = useEditor();
+  const [toolbar, setToolbar] = useState(false);
+
+  return (
+    <>
+      <IconButton variant="SurfaceVariant" onClick={() => setOpen(!open)}>
+        <Icon src={Icons.BlockQuote} />
+      </IconButton>
+      <Overlay open={open} backdrop={<OverlayBackdrop />}>
+        <OverlayCenter>
+          <FocusTrap
+            focusTrapOptions={{
+              initialFocus: false,
+              onDeactivate: () => setOpen(false),
+              clickOutsideDeactivates: true,
+              escapeDeactivates: stopPropagation,
+            }}
+          >
+            <Modal size="500">
+              <div style={{ padding: config.space.S400 }}>
+                <CustomEditor
+                  editor={editor}
+                  placeholder="Send a message..."
+                  before={
+                    <IconButton variant="SurfaceVariant" size="300" radii="300">
+                      <Icon src={Icons.PlusCircle} />
+                    </IconButton>
+                  }
+                  after={
+                    <>
+                      <IconButton
+                        variant="SurfaceVariant"
+                        size="300"
+                        radii="300"
+                        onClick={() => setToolbar(!toolbar)}
+                        aria-pressed={toolbar}
+                      >
+                        <Icon src={toolbar ? Icons.AlphabetUnderline : Icons.Alphabet} />
+                      </IconButton>
+                      <IconButton variant="SurfaceVariant" size="300" radii="300">
+                        <Icon src={Icons.Smile} />
+                      </IconButton>
+                      <IconButton variant="SurfaceVariant" size="300" radii="300">
+                        <Icon src={Icons.Send} />
+                      </IconButton>
+                    </>
+                  }
+                  bottom={
+                    toolbar && (
+                      <div>
+                        <Line variant="SurfaceVariant" size="300" />
+                        <Toolbar />
+                      </div>
+                    )
+                  }
+                />
+              </div>
+            </Modal>
+          </FocusTrap>
+        </OverlayCenter>
+      </Overlay>
+    </>
+  );
+}

src/app/components/editor/Editor.tsx

@@ -0,0 +1,167 @@
+/* eslint-disable no-param-reassign */
+import React, {
+  ClipboardEventHandler,
+  KeyboardEventHandler,
+  ReactNode,
+  forwardRef,
+  useCallback,
+  useState,
+} from 'react';
+import { Box, Scroll, Text } from 'folds';
+import { Descendant, Editor, createEditor } from 'slate';
+import {
+  Slate,
+  Editable,
+  withReact,
+  RenderLeafProps,
+  RenderElementProps,
+  RenderPlaceholderProps,
+} from 'slate-react';
+import { withHistory } from 'slate-history';
+import { BlockType } from './types';
+import { RenderElement, RenderLeaf } from './Elements';
+import { CustomElement } from './slate';
+import * as css from './Editor.css';
+import { toggleKeyboardShortcut } from './keyboard';
+
+const initialValue: CustomElement[] = [
+  {
+    type: BlockType.Paragraph,
+    children: [{ text: '' }],
+  },
+];
+
+const withInline = (editor: Editor): Editor => {
+  const { isInline } = editor;
+
+  editor.isInline = (element) =>
+    [BlockType.Mention, BlockType.Emoticon, BlockType.Link, BlockType.Command].includes(
+      element.type
+    ) || isInline(element);
+
+  return editor;
+};
+
+const withVoid = (editor: Editor): Editor => {
+  const { isVoid } = editor;
+
+  editor.isVoid = (element) =>
+    [BlockType.Mention, BlockType.Emoticon, BlockType.Command].includes(element.type) ||
+    isVoid(element);
+
+  return editor;
+};
+
+export const useEditor = (): Editor => {
+  const [editor] = useState(() => withInline(withVoid(withReact(withHistory(createEditor())))));
+  return editor;
+};
+
+export type EditorChangeHandler = (value: Descendant[]) => void;
+type CustomEditorProps = {
+  editableName?: string;
+  top?: ReactNode;
+  bottom?: ReactNode;
+  before?: ReactNode;
+  after?: ReactNode;
+  maxHeight?: string;
+  editor: Editor;
+  placeholder?: string;
+  onKeyDown?: KeyboardEventHandler;
+  onKeyUp?: KeyboardEventHandler;
+  onChange?: EditorChangeHandler;
+  onPaste?: ClipboardEventHandler;
+};
+export const CustomEditor = forwardRef<HTMLDivElement, CustomEditorProps>(
+  (
+    {
+      editableName,
+      top,
+      bottom,
+      before,
+      after,
+      maxHeight = '50vh',
+      editor,
+      placeholder,
+      onKeyDown,
+      onKeyUp,
+      onChange,
+      onPaste,
+    },
+    ref
+  ) => {
+    const renderElement = useCallback(
+      (props: RenderElementProps) => <RenderElement {...props} />,
+      []
+    );
+
+    const renderLeaf = useCallback((props: RenderLeafProps) => <RenderLeaf {...props} />, []);
+
+    const handleKeydown: KeyboardEventHandler = useCallback(
+      (evt) => {
+        onKeyDown?.(evt);
+        const shortcutToggled = toggleKeyboardShortcut(editor, evt);
+        if (shortcutToggled) evt.preventDefault();
+      },
+      [editor, onKeyDown]
+    );
+
+    const renderPlaceholder = useCallback(({ attributes, children }: RenderPlaceholderProps) => {
+      // drop style attribute as we use our custom placeholder css.
+      // eslint-disable-next-line @typescript-eslint/no-unused-vars
+      const { style, ...props } = attributes;
+      return (
+        <Text
+          as="span"
+          {...props}
+          className={css.EditorPlaceholder}
+          contentEditable={false}
+          truncate
+        >
+          {children}
+        </Text>
+      );
+    }, []);
+
+    return (
+      <div className={css.Editor} ref={ref}>
+        <Slate editor={editor} initialValue={initialValue} onChange={onChange}>
+          {top}
+          <Box alignItems="Start">
+            {before && (
+              <Box className={css.EditorOptions} alignItems="Center" gap="100" shrink="No">
+                {before}
+              </Box>
+            )}
+            <Scroll
+              className={css.EditorTextareaScroll}
+              variant="SurfaceVariant"
+              style={{ maxHeight }}
+              size="300"
+              visibility="Hover"
+              hideTrack
+            >
+              <Editable
+                data-editable-name={editableName}
+                className={css.EditorTextarea}
+                placeholder={placeholder}
+                renderPlaceholder={renderPlaceholder}
+                renderElement={renderElement}
+                renderLeaf={renderLeaf}
+                onKeyDown={handleKeydown}
+                onKeyUp={onKeyUp}
+                onPaste={onPaste}
+              />
+            </Scroll>
+            {after && (
+              <Box className={css.EditorOptions} alignItems="Center" gap="100" shrink="No">
+                {after}
+              </Box>
+            )}
+          </Box>
+          {bottom}
+        </Slate>
+      </div>
+    );
+  }
+);

src/app/components/editor/Elements.tsx

@@ -0,0 +1,273 @@
+import { Scroll, Text } from 'folds';
+import React from 'react';
+import {
+  RenderElementProps,
+  RenderLeafProps,
+  useFocused,
+  useSelected,
+  useSlate,
+} from 'slate-react';
+
+import * as css from '../../styles/CustomHtml.css';
+import { CommandElement, EmoticonElement, LinkElement, MentionElement } from './slate';
+import { useMatrixClient } from '../../hooks/useMatrixClient';
+import { getBeginCommand } from './utils';
+import { BlockType } from './types';
+
+// Put this at the start and end of an inline component to work around this Chromium bug:
+// https://bugs.chromium.org/p/chromium/issues/detail?id=1249405
+function InlineChromiumBugfix() {
+  return (
+    <span className={css.InlineChromiumBugfix} contentEditable={false}>
+      {String.fromCodePoint(160) /* Non-breaking space */}
+    </span>
+  );
+}
+
+function RenderMentionElement({
+  attributes,
+  element,
+  children,
+}: { element: MentionElement } & RenderElementProps) {
+  const selected = useSelected();
+  const focused = useFocused();
+
+  return (
+    <span
+      {...attributes}
+      className={css.Mention({
+        highlight: element.highlight,
+        focus: selected && focused,
+      })}
+      contentEditable={false}
+    >
+      {element.name}
+      {children}
+    </span>
+  );
+}
+function RenderCommandElement({
+  attributes,
+  element,
+  children,
+}: { element: CommandElement } & RenderElementProps) {
+  const selected = useSelected();
+  const focused = useFocused();
+  const editor = useSlate();
+
+  return (
+    <span
+      {...attributes}
+      className={css.Command({
+        focus: selected && focused,
+        active: getBeginCommand(editor) === element.command,
+      })}
+      contentEditable={false}
+    >
+      {`/${element.command}`}
+      {children}
+    </span>
+  );
+}
+
+function RenderEmoticonElement({
+  attributes,
+  element,
+  children,
+}: { element: EmoticonElement } & RenderElementProps) {
+  const mx = useMatrixClient();
+  const selected = useSelected();
+  const focused = useFocused();
+
+  return (
+    <span className={css.EmoticonBase} {...attributes}>
+      <span
+        className={css.Emoticon({
+          focus: selected && focused,
+        })}
+        contentEditable={false}
+      >
+        {element.key.startsWith('mxc://') ? (
+          <img
+            className={css.EmoticonImg}
+            src={mx.mxcUrlToHttp(element.key) ?? element.key}
+            alt={element.shortcode}
+          />
+        ) : (
+          element.key
+        )}
+        {children}
+      </span>
+    </span>
+  );
+}
+
+function RenderLinkElement({
+  attributes,
+  element,
+  children,
+}: { element: LinkElement } & RenderElementProps) {
+  return (
+    <a href={element.href} {...attributes}>
+      <InlineChromiumBugfix />
+      {children}
+    </a>
+  );
+}
+
+export function RenderElement({ attributes, element, children }: RenderElementProps) {
+  switch (element.type) {
+    case BlockType.Paragraph:
+      return (
+        <Text {...attributes} className={css.Paragraph}>
+          {children}
+        </Text>
+      );
+    case BlockType.Heading:
+      if (element.level === 1)
+        return (
+          <Text className={css.Heading} as="h2" size="H2" {...attributes}>
+            {children}
+          </Text>
+        );
+      if (element.level === 2)
+        return (
+          <Text className={css.Heading} as="h3" size="H3" {...attributes}>
+            {children}
+          </Text>
+        );
+      if (element.level === 3)
+        return (
+          <Text className={css.Heading} as="h4" size="H4" {...attributes}>
+            {children}
+          </Text>
+        );
+      return (
+        <Text className={css.Heading} as="h3" size="H3" {...attributes}>
+          {children}
+        </Text>
+      );
+    case BlockType.CodeLine:
+      return <div {...attributes}>{children}</div>;
+    case BlockType.CodeBlock:
+      return (
+        <Text as="pre" className={css.CodeBlock} {...attributes}>
+          <Scroll
+            direction="Horizontal"
+            variant="Secondary"
+            size="300"
+            visibility="Hover"
+            hideTrack
+          >
+            <div className={css.CodeBlockInternal}>{children}</div>
+          </Scroll>
+        </Text>
+      );
+    case BlockType.QuoteLine:
+      return <div {...attributes}>{children}</div>;
+    case BlockType.BlockQuote:
+      return (
+        <Text as="blockquote" className={css.BlockQuote} {...attributes}>
+          {children}
+        </Text>
+      );
+    case BlockType.ListItem:
+      return (
+        <Text as="li" {...attributes}>
+          {children}
+        </Text>
+      );
+    case BlockType.OrderedList:
+      return (
+        <ol className={css.List} {...attributes}>
+          {children}
+        </ol>
+      );
+    case BlockType.UnorderedList:
+      return (
+        <ul className={css.List} {...attributes}>
+          {children}
+        </ul>
+      );
+    case BlockType.Mention:
+      return (
+        <RenderMentionElement attributes={attributes} element={element}>
+          {children}
+        </RenderMentionElement>
+      );
+    case BlockType.Emoticon:
+      return (
+        <RenderEmoticonElement attributes={attributes} element={element}>
+          {children}
+        </RenderEmoticonElement>
+      );
+    case BlockType.Link:
+      return (
+        <RenderLinkElement attributes={attributes} element={element}>
+          {children}
+        </RenderLinkElement>
+      );
+    case BlockType.Command:
+      return (
+        <RenderCommandElement attributes={attributes} element={element}>
+          {children}
+        </RenderCommandElement>
+      );
+    default:
+      return (
+        <Text className={css.Paragraph} {...attributes}>
+          {children}
+        </Text>
+      );
+  }
+}
+
+export function RenderLeaf({ attributes, leaf, children }: RenderLeafProps) {
+  let child = children;
+  if (leaf.bold)
+    child = (
+      <strong {...attributes}>
+        <InlineChromiumBugfix />
+        {child}
+      </strong>
+    );
+  if (leaf.italic)
+    child = (
+      <i {...attributes}>
+        <InlineChromiumBugfix />
+        {child}
+      </i>
+    );
+  if (leaf.underline)
+    child = (
+      <u {...attributes}>
+        <InlineChromiumBugfix />
+        {child}
+      </u>
+    );
+  if (leaf.strikeThrough)
+    child = (
+      <s {...attributes}>
+        <InlineChromiumBugfix />
+        {child}
+      </s>
+    );
+  if (leaf.code)
+    child = (
+      <code className={css.Code} {...attributes}>
+        <InlineChromiumBugfix />
+        {child}
+      </code>
+    );
+  if (leaf.spoiler)
+    child = (
+      <span className={css.Spoiler()} {...attributes}>
+        <InlineChromiumBugfix />
+        {child}
+      </span>
+    );
+
+  if (child !== children) return child;
+
+  return <span {...attributes}>{child}</span>;
+}

src/app/components/editor/Toolbar.tsx

@@ -0,0 +1,363 @@
+import FocusTrap from 'focus-trap-react';
+import {
+  Badge,
+  Box,
+  config,
+  Icon,
+  IconButton,
+  Icons,
+  IconSrc,
+  Line,
+  Menu,
+  PopOut,
+  RectCords,
+  Scroll,
+  Text,
+  Tooltip,
+  TooltipProvider,
+  toRem,
+} from 'folds';
+import React, { MouseEventHandler, ReactNode, useState } from 'react';
+import { ReactEditor, useSlate } from 'slate-react';
+import {
+  headingLevel,
+  isAnyMarkActive,
+  isBlockActive,
+  isMarkActive,
+  removeAllMark,
+  toggleBlock,
+  toggleMark,
+} from './utils';
+import * as css from './Editor.css';
+import { BlockType, MarkType } from './types';
+import { HeadingLevel } from './slate';
+import { isMacOS } from '../../utils/user-agent';
+import { KeySymbol } from '../../utils/key-symbol';
+import { useSetting } from '../../state/hooks/settings';
+import { settingsAtom } from '../../state/settings';
+import { stopPropagation } from '../../utils/keyboard';
+
+function BtnTooltip({ text, shortCode }: { text: string; shortCode?: string }) {
+  return (
+    <Tooltip style={{ padding: config.space.S300 }}>
+      <Box gap="200" direction="Column" alignItems="Center">
+        <Text align="Center">{text}</Text>
+        {shortCode && (
+          <Badge as="kbd" radii="300" size="500">
+            <Text size="T200" align="Center">
+              {shortCode}
+            </Text>
+          </Badge>
+        )}
+      </Box>
+    </Tooltip>
+  );
+}
+
+type MarkButtonProps = { format: MarkType; icon: IconSrc; tooltip: ReactNode };
+export function MarkButton({ format, icon, tooltip }: MarkButtonProps) {
+  const editor = useSlate();
+  const disableInline = isBlockActive(editor, BlockType.CodeBlock);
+
+  if (disableInline) {
+    removeAllMark(editor);
+  }
+
+  const handleClick = () => {
+    toggleMark(editor, format);
+    ReactEditor.focus(editor);
+  };
+
+  return (
+    <TooltipProvider tooltip={tooltip} delay={500}>
+      {(triggerRef) => (
+        <IconButton
+          ref={triggerRef}
+          variant="SurfaceVariant"
+          onClick={handleClick}
+          aria-pressed={isMarkActive(editor, format)}
+          size="400"
+          radii="300"
+          disabled={disableInline}
+        >
+          <Icon size="200" src={icon} />
+        </IconButton>
+      )}
+    </TooltipProvider>
+  );
+}
+
+type BlockButtonProps = {
+  format: BlockType;
+  icon: IconSrc;
+  tooltip: ReactNode;
+};
+export function BlockButton({ format, icon, tooltip }: BlockButtonProps) {
+  const editor = useSlate();
+
+  const handleClick = () => {
+    toggleBlock(editor, format, { level: 1 });
+    ReactEditor.focus(editor);
+  };
+
+  return (
+    <TooltipProvider tooltip={tooltip} delay={500}>
+      {(triggerRef) => (
+        <IconButton
+          ref={triggerRef}
+          variant="SurfaceVariant"
+          onClick={handleClick}
+          aria-pressed={isBlockActive(editor, format)}
+          size="400"
+          radii="300"
+        >
+          <Icon size="200" src={icon} />
+        </IconButton>
+      )}
+    </TooltipProvider>
+  );
+}
+
+export function HeadingBlockButton() {
+  const editor = useSlate();
+  const level = headingLevel(editor);
+  const [anchor, setAnchor] = useState<RectCords>();
+  const isActive = isBlockActive(editor, BlockType.Heading);
+  const modKey = isMacOS() ? KeySymbol.Command : 'Ctrl';
+
+  const handleMenuSelect = (selectedLevel: HeadingLevel) => {
+    setAnchor(undefined);
+    toggleBlock(editor, BlockType.Heading, { level: selectedLevel });
+    ReactEditor.focus(editor);
+  };
+
+  const handleMenuOpen: MouseEventHandler<HTMLButtonElement> = (evt) => {
+    if (isActive) {
+      toggleBlock(editor, BlockType.Heading);
+      return;
+    }
+    setAnchor(evt.currentTarget.getBoundingClientRect());
+  };
+  return (
+    <PopOut
+      anchor={anchor}
+      offset={5}
+      position="Top"
+      content={
+        <FocusTrap
+          focusTrapOptions={{
+            initialFocus: false,
+            onDeactivate: () => setAnchor(undefined),
+            clickOutsideDeactivates: true,
+            isKeyForward: (evt: KeyboardEvent) =>
+              evt.key === 'ArrowDown' || evt.key === 'ArrowRight',
+            isKeyBackward: (evt: KeyboardEvent) => evt.key === 'ArrowUp' || evt.key === 'ArrowLeft',
+            escapeDeactivates: stopPropagation,
+          }}
+        >
+          <Menu style={{ padding: config.space.S100 }}>
+            <Box gap="100">
+              <TooltipProvider
+                tooltip={<BtnTooltip text="Heading 1" shortCode={`${modKey} + 1`} />}
+                delay={500}
+              >
+                {(triggerRef) => (
+                  <IconButton
+                    ref={triggerRef}
+                    onClick={() => handleMenuSelect(1)}
+                    size="400"
+                    radii="300"
+                  >
+                    <Icon size="200" src={Icons.Heading1} />
+                  </IconButton>
+                )}
+              </TooltipProvider>
+              <TooltipProvider
+                tooltip={<BtnTooltip text="Heading 2" shortCode={`${modKey} + 2`} />}
+                delay={500}
+              >
+                {(triggerRef) => (
+                  <IconButton
+                    ref={triggerRef}
+                    onClick={() => handleMenuSelect(2)}
+                    size="400"
+                    radii="300"
+                  >
+                    <Icon size="200" src={Icons.Heading2} />
+                  </IconButton>
+                )}
+              </TooltipProvider>
+              <TooltipProvider
+                tooltip={<BtnTooltip text="Heading 3" shortCode={`${modKey} + 3`} />}
+                delay={500}
+              >
+                {(triggerRef) => (
+                  <IconButton
+                    ref={triggerRef}
+                    onClick={() => handleMenuSelect(3)}
+                    size="400"
+                    radii="300"
+                  >
+                    <Icon size="200" src={Icons.Heading3} />
+                  </IconButton>
+                )}
+              </TooltipProvider>
+            </Box>
+          </Menu>
+        </FocusTrap>
+      }
+    >
+      <IconButton
+        style={{ width: 'unset' }}
+        variant="SurfaceVariant"
+        onClick={handleMenuOpen}
+        aria-pressed={isActive}
+        size="400"
+        radii="300"
+      >
+        <Icon size="200" src={level ? Icons[`Heading${level}`] : Icons.Heading1} />
+        <Icon size="200" src={isActive ? Icons.Cross : Icons.ChevronBottom} />
+      </IconButton>
+    </PopOut>
+  );
+}
+
+type ExitFormattingProps = { tooltip: ReactNode };
+export function ExitFormatting({ tooltip }: ExitFormattingProps) {
+  const editor = useSlate();
+
+  const handleClick = () => {
+    if (isAnyMarkActive(editor)) {
+      removeAllMark(editor);
+    } else if (!isBlockActive(editor, BlockType.Paragraph)) {
+      toggleBlock(editor, BlockType.Paragraph);
+    }
+    ReactEditor.focus(editor);
+  };
+
+  return (
+    <TooltipProvider tooltip={tooltip} delay={500}>
+      {(triggerRef) => (
+        <IconButton
+          ref={triggerRef}
+          variant="SurfaceVariant"
+          onClick={handleClick}
+          size="400"
+          radii="300"
+        >
+          <Text size="B400">{`Exit ${KeySymbol.Hyper}`}</Text>
+        </IconButton>
+      )}
+    </TooltipProvider>
+  );
+}
+
+export function Toolbar() {
+  const editor = useSlate();
+  const modKey = isMacOS() ? KeySymbol.Command : 'Ctrl';
+  const disableInline = isBlockActive(editor, BlockType.CodeBlock);
+
+  const canEscape = isAnyMarkActive(editor) || !isBlockActive(editor, BlockType.Paragraph);
+  const [isMarkdown, setIsMarkdown] = useSetting(settingsAtom, 'isMarkdown');
+
+  return (
+    <Box className={css.EditorToolbarBase}>
+      <Scroll direction="Horizontal" size="0">
+        <Box className={css.EditorToolbar} alignItems="Center" gap="300">
+          <>
+            <Box shrink="No" gap="100">
+              <MarkButton
+                format={MarkType.Bold}
+                icon={Icons.Bold}
+                tooltip={<BtnTooltip text="Bold" shortCode={`${modKey} + B`} />}
+              />
+              <MarkButton
+                format={MarkType.Italic}
+                icon={Icons.Italic}
+                tooltip={<BtnTooltip text="Italic" shortCode={`${modKey} + I`} />}
+              />
+              <MarkButton
+                format={MarkType.Underline}
+                icon={Icons.Underline}
+                tooltip={<BtnTooltip text="Underline" shortCode={`${modKey} + U`} />}
+              />
+              <MarkButton
+                format={MarkType.StrikeThrough}
+                icon={Icons.Strike}
+                tooltip={<BtnTooltip text="Strike Through" shortCode={`${modKey} + S`} />}
+              />
+              <MarkButton
+                format={MarkType.Code}
+                icon={Icons.Code}
+                tooltip={<BtnTooltip text="Inline Code" shortCode={`${modKey} + [`} />}
+              />
+              <MarkButton
+                format={MarkType.Spoiler}
+                icon={Icons.EyeBlind}
+                tooltip={<BtnTooltip text="Spoiler" shortCode={`${modKey} + H`} />}
+              />
+            </Box>
+            <Line variant="SurfaceVariant" direction="Vertical" style={{ height: toRem(12) }} />
+          </>
+          <Box shrink="No" gap="100">
+            <BlockButton
+              format={BlockType.BlockQuote}
+              icon={Icons.BlockQuote}
+              tooltip={<BtnTooltip text="Block Quote" shortCode={`${modKey} + '`} />}
+            />
+            <BlockButton
+              format={BlockType.CodeBlock}
+              icon={Icons.BlockCode}
+              tooltip={<BtnTooltip text="Block Code" shortCode={`${modKey} + ;`} />}
+            />
+            <BlockButton
+              format={BlockType.OrderedList}
+              icon={Icons.OrderList}
+              tooltip={<BtnTooltip text="Ordered List" shortCode={`${modKey} + 7`} />}
+            />
+            <BlockButton
+              format={BlockType.UnorderedList}
+              icon={Icons.UnorderList}
+              tooltip={<BtnTooltip text="Unordered List" shortCode={`${modKey} + 8`} />}
+            />
+            <HeadingBlockButton />
+          </Box>
+          {canEscape && (
+            <>
+              <Line variant="SurfaceVariant" direction="Vertical" style={{ height: toRem(12) }} />
+              <Box shrink="No" gap="100">
+                <ExitFormatting
+                  tooltip={
+                    <BtnTooltip text="Exit Formatting" shortCode={`Escape, ${modKey} + E`} />
+                  }
+                />
+              </Box>
+            </>
+          )}
+          <Box className={css.MarkdownBtnBox} shrink="No" grow="Yes" justifyContent="End">
+            <TooltipProvider
+              align="End"
+              tooltip={<BtnTooltip text="Toggle Markdown" />}
+              delay={500}
+            >
+              {(triggerRef) => (
+                <IconButton
+                  ref={triggerRef}
+                  variant="SurfaceVariant"
+                  onClick={() => setIsMarkdown(!isMarkdown)}
+                  aria-pressed={isMarkdown}
+                  size="300"
+                  radii="300"
+                  disabled={disableInline || !!isAnyMarkActive(editor)}
+                >
+                  <Icon size="200" src={Icons.Markdown} filled={isMarkdown} />
+                </IconButton>
+              )}
+            </TooltipProvider>
+            <span />
+          </Box>
+        </Box>
+      </Scroll>
+    </Box>
+  );
+}

src/app/components/editor/autocomplete/AutocompleteMenu.css.tsx

@@ -0,0 +1,35 @@
+import { style } from '@vanilla-extract/css';
+import { DefaultReset, config } from 'folds';
+
+export const AutocompleteMenuBase = style([
+  DefaultReset,
+  {
+    position: 'relative',
+  },
+]);
+
+export const AutocompleteMenuContainer = style([
+  DefaultReset,
+  {
+    position: 'absolute',
+    bottom: config.space.S200,
+    left: 0,
+    right: 0,
+    zIndex: config.zIndex.Max,
+  },
+]);
+
+export const AutocompleteMenu = style([
+  DefaultReset,
+  {
+    maxHeight: '30vh',
+    height: '100%',
+    display: 'flex',
+    flexDirection: 'column',
+  },
+]);
+
+export const AutocompleteMenuHeader = style([
+  DefaultReset,
+  { padding: `0 ${config.space.S300}`, flexShrink: 0 },
+]);

src/app/components/editor/autocomplete/AutocompleteMenu.tsx

@@ -0,0 +1,42 @@
+import React, { ReactNode } from 'react';
+import FocusTrap from 'focus-trap-react';
+import { isKeyHotkey } from 'is-hotkey';
+import { Header, Menu, Scroll, config } from 'folds';
+
+import * as css from './AutocompleteMenu.css';
+import { preventScrollWithArrowKey, stopPropagation } from '../../../utils/keyboard';
+
+type AutocompleteMenuProps = {
+  requestClose: () => void;
+  headerContent: ReactNode;
+  children: ReactNode;
+};
+export function AutocompleteMenu({ headerContent, requestClose, children }: AutocompleteMenuProps) {
+  return (
+    <div className={css.AutocompleteMenuBase}>
+      <div className={css.AutocompleteMenuContainer}>
+        <FocusTrap
+          focusTrapOptions={{
+            initialFocus: false,
+            onDeactivate: () => requestClose(),
+            returnFocusOnDeactivate: false,
+            clickOutsideDeactivates: true,
+            allowOutsideClick: true,
+            isKeyForward: (evt: KeyboardEvent) => isKeyHotkey('arrowdown', evt),
+            isKeyBackward: (evt: KeyboardEvent) => isKeyHotkey('arrowup', evt),
+            escapeDeactivates: stopPropagation,
+          }}
+        >
+          <Menu className={css.AutocompleteMenu}>
+            <Header className={css.AutocompleteMenuHeader} size="400">
+              {headerContent}
+            </Header>
+            <Scroll style={{ flexGrow: 1 }} onKeyDown={preventScrollWithArrowKey}>
+              <div style={{ padding: config.space.S200 }}>{children}</div>
+            </Scroll>
+          </Menu>
+        </FocusTrap>
+      </div>
+    </div>
+  );
+}

src/app/components/editor/autocomplete/EmoticonAutocomplete.tsx

@@ -0,0 +1,130 @@
+import React, { KeyboardEvent as ReactKeyboardEvent, useEffect, useMemo } from 'react';
+import { Editor } from 'slate';
+import { Box, MenuItem, Text, toRem } from 'folds';
+import { Room } from 'matrix-js-sdk';
+
+import { AutocompleteQuery } from './autocompleteQuery';
+import { AutocompleteMenu } from './AutocompleteMenu';
+import { useMatrixClient } from '../../../hooks/useMatrixClient';
+import {
+  SearchItemStrGetter,
+  UseAsyncSearchOptions,
+  useAsyncSearch,
+} from '../../../hooks/useAsyncSearch';
+import { onTabPress } from '../../../utils/keyboard';
+import { createEmoticonElement, moveCursor, replaceWithElement } from '../utils';
+import { useRecentEmoji } from '../../../hooks/useRecentEmoji';
+import { useRelevantImagePacks } from '../../../hooks/useImagePacks';
+import { IEmoji, emojis } from '../../../plugins/emoji';
+import { ExtendedPackImage, PackUsage } from '../../../plugins/custom-emoji';
+import { useKeyDown } from '../../../hooks/useKeyDown';
+
+type EmoticonCompleteHandler = (key: string, shortcode: string) => void;
+
+type EmoticonSearchItem = ExtendedPackImage | IEmoji;
+
+type EmoticonAutocompleteProps = {
+  imagePackRooms: Room[];
+  editor: Editor;
+  query: AutocompleteQuery<string>;
+  requestClose: () => void;
+};
+
+const SEARCH_OPTIONS: UseAsyncSearchOptions = {
+  limit: 20,
+  matchOptions: {
+    contain: true,
+  },
+};
+
+const getEmoticonStr: SearchItemStrGetter<EmoticonSearchItem> = (emoticon) => [
+  `:${emoticon.shortcode}:`,
+];
+
+export function EmoticonAutocomplete({
+  imagePackRooms,
+  editor,
+  query,
+  requestClose,
+}: EmoticonAutocompleteProps) {
+  const mx = useMatrixClient();
+
+  const imagePacks = useRelevantImagePacks(mx, PackUsage.Emoticon, imagePackRooms);
+  const recentEmoji = useRecentEmoji(mx, 20);
+
+  const searchList = useMemo(() => {
+    const list: Array<EmoticonSearchItem> = [];
+    return list.concat(
+      imagePacks.flatMap((pack) => pack.getImagesFor(PackUsage.Emoticon)),
+      emojis
+    );
+  }, [imagePacks]);
+
+  const [result, search, resetSearch] = useAsyncSearch(searchList, getEmoticonStr, SEARCH_OPTIONS);
+  const autoCompleteEmoticon = result ? result.items : recentEmoji;
+
+  useEffect(() => {
+    if (query.text) search(query.text);
+    else resetSearch();
+  }, [query.text, search, resetSearch]);
+
+  const handleAutocomplete: EmoticonCompleteHandler = (key, shortcode) => {
+    const emoticonEl = createEmoticonElement(key, shortcode);
+    replaceWithElement(editor, query.range, emoticonEl);
+    moveCursor(editor, true);
+    requestClose();
+  };
+
+  useKeyDown(window, (evt: KeyboardEvent) => {
+    onTabPress(evt, () => {
+      if (autoCompleteEmoticon.length === 0) return;
+      const emoticon = autoCompleteEmoticon[0];
+      const key = 'url' in emoticon ? emoticon.url : emoticon.unicode;
+      handleAutocomplete(key, emoticon.shortcode);
+    });
+  });
+
+  return autoCompleteEmoticon.length === 0 ? null : (
+    <AutocompleteMenu headerContent={<Text size="L400">Emojis</Text>} requestClose={requestClose}>
+      {autoCompleteEmoticon.map((emoticon) => {
+        const isCustomEmoji = 'url' in emoticon;
+        const key = isCustomEmoji ? emoticon.url : emoticon.unicode;
+        return (
+          <MenuItem
+            key={emoticon.shortcode + key}
+            as="button"
+            radii="300"
+            onKeyDown={(evt: ReactKeyboardEvent<HTMLButtonElement>) =>
+              onTabPress(evt, () => handleAutocomplete(key, emoticon.shortcode))
+            }
+            onClick={() => handleAutocomplete(key, emoticon.shortcode)}
+            before={
+              isCustomEmoji ? (
+                <Box
+                  shrink="No"
+                  as="img"
+                  src={mx.mxcUrlToHttp(key) || key}
+                  alt={emoticon.shortcode}
+                  style={{ width: toRem(24), height: toRem(24), objectFit: 'contain' }}
+                />
+              ) : (
+                <Box
+                  shrink="No"
+                  as="span"
+                  display="InlineFlex"
+                  style={{ fontSize: toRem(24), lineHeight: toRem(24) }}
+                >
+                  {key}
+                </Box>
+              )
+            }
+          >
+            <Text style={{ flexGrow: 1 }} size="B400" truncate>
+              :{emoticon.shortcode}:
+            </Text>
+          </MenuItem>
+        );
+      })}
+    </AutocompleteMenu>
+  );
+}

src/app/components/editor/autocomplete/RoomMentionAutocomplete.tsx

@@ -0,0 +1,192 @@
+import React, { KeyboardEvent as ReactKeyboardEvent, useCallback, useEffect } from 'react';
+import { Editor } from 'slate';
+import { Avatar, Icon, Icons, MenuItem, Text } from 'folds';
+import { JoinRule, MatrixClient } from 'matrix-js-sdk';
+import { useAtomValue } from 'jotai';
+
+import { createMentionElement, moveCursor, replaceWithElement } from '../utils';
+import { getDirectRoomAvatarUrl } from '../../../utils/room';
+import { useMatrixClient } from '../../../hooks/useMatrixClient';
+import { AutocompleteQuery } from './autocompleteQuery';
+import { AutocompleteMenu } from './AutocompleteMenu';
+import { getMxIdServer, validMxId } from '../../../utils/matrix';
+import { UseAsyncSearchOptions, useAsyncSearch } from '../../../hooks/useAsyncSearch';
+import { onTabPress } from '../../../utils/keyboard';
+import { useKeyDown } from '../../../hooks/useKeyDown';
+import { mDirectAtom } from '../../../state/mDirectList';
+import { allRoomsAtom } from '../../../state/room-list/roomList';
+import { factoryRoomIdByActivity } from '../../../utils/sort';
+import { RoomAvatar, RoomIcon } from '../../room-avatar';
+import { getViaServers } from '../../../plugins/via-servers';
+
+type MentionAutoCompleteHandler = (roomAliasOrId: string, name: string) => void;
+
+const roomAliasFromQueryText = (mx: MatrixClient, text: string) =>
+  validMxId(`#${text}`)
+    ? `#${text}`
+    : `#${text}${text.endsWith(':') ? '' : ':'}${getMxIdServer(mx.getUserId() ?? '')}`;
+
+function UnknownRoomMentionItem({
+  query,
+  handleAutocomplete,
+}: {
+  query: AutocompleteQuery<string>;
+  handleAutocomplete: MentionAutoCompleteHandler;
+}) {
+  const mx = useMatrixClient();
+  const roomAlias: string = roomAliasFromQueryText(mx, query.text);
+
+  const handleSelect = () => handleAutocomplete(roomAlias, roomAlias);
+
+  return (
+    <MenuItem
+      as="button"
+      radii="300"
+      onKeyDown={(evt: ReactKeyboardEvent<HTMLButtonElement>) => onTabPress(evt, handleSelect)}
+      onClick={handleSelect}
+      before={
+        <Avatar size="200">
+          <Icon src={Icons.Hash} size="100" />
+        </Avatar>
+      }
+    >
+      <Text style={{ flexGrow: 1 }} size="B400">
+        {roomAlias}
+      </Text>
+    </MenuItem>
+  );
+}
+
+type RoomMentionAutocompleteProps = {
+  roomId: string;
+  editor: Editor;
+  query: AutocompleteQuery<string>;
+  requestClose: () => void;
+};
+
+const SEARCH_OPTIONS: UseAsyncSearchOptions = {
+  limit: 20,
+  matchOptions: {
+    contain: true,
+  },
+};
+
+export function RoomMentionAutocomplete({
+  roomId,
+  editor,
+  query,
+  requestClose,
+}: RoomMentionAutocompleteProps) {
+  const mx = useMatrixClient();
+  const mDirects = useAtomValue(mDirectAtom);
+
+  const allRooms = useAtomValue(allRoomsAtom).sort(factoryRoomIdByActivity(mx));
+
+  const [result, search, resetSearch] = useAsyncSearch(
+    allRooms,
+    useCallback(
+      (rId) => {
+        const r = mx.getRoom(rId);
+        if (!r) return 'Unknown Room';
+        const alias = r.getCanonicalAlias();
+        if (alias) return [r.name, alias];
+        return r.name;
+      },
+      [mx]
+    ),
+    SEARCH_OPTIONS
+  );
+
+  const autoCompleteRoomIds = result ? result.items : allRooms.slice(0, 20);
+
+  useEffect(() => {
+    if (query.text) search(query.text);
+    else resetSearch();
+  }, [query.text, search, resetSearch]);
+
+  const handleAutocomplete: MentionAutoCompleteHandler = (roomAliasOrId, name) => {
+    const mentionRoom = mx.getRoom(roomAliasOrId);
+    const viaServers = mentionRoom ? getViaServers(mentionRoom) : undefined;
+    const mentionEl = createMentionElement(
+      roomAliasOrId,
+      name.startsWith('#') ? name : `#${name}`,
+      roomId === roomAliasOrId || mx.getRoom(roomId)?.getCanonicalAlias() === roomAliasOrId,
+      undefined,
+      viaServers
+    );
+    replaceWithElement(editor, query.range, mentionEl);
+    moveCursor(editor, true);
+    requestClose();
+  };
+
+  useKeyDown(window, (evt: KeyboardEvent) => {
+    onTabPress(evt, () => {
+      if (autoCompleteRoomIds.length === 0) {
+        const alias = roomAliasFromQueryText(mx, query.text);
+        handleAutocomplete(alias, alias);
+        return;
+      }
+      const rId = autoCompleteRoomIds[0];
+      const r = mx.getRoom(rId);
+      const name = r?.name ?? rId;
+      handleAutocomplete(r?.getCanonicalAlias() ?? rId, name);
+    });
+  });
+
+  return (
+    <AutocompleteMenu headerContent={<Text size="L400">Rooms</Text>} requestClose={requestClose}>
+      {autoCompleteRoomIds.length === 0 ? (
+        <UnknownRoomMentionItem query={query} handleAutocomplete={handleAutocomplete} />
+      ) : (
+        autoCompleteRoomIds.map((rId) => {
+          const room = mx.getRoom(rId);
+          if (!room) return null;
+          const dm = mDirects.has(room.roomId);
+
+          const handleSelect = () => handleAutocomplete(room.getCanonicalAlias() ?? rId, room.name);
+
+          return (
+            <MenuItem
+              key={rId}
+              as="button"
+              radii="300"
+              onKeyDown={(evt: ReactKeyboardEvent<HTMLButtonElement>) =>
+                onTabPress(evt, handleSelect)
+              }
+              onClick={handleSelect}
+              after={
+                <Text size="T200" priority="300" truncate>
+                  {room.getCanonicalAlias() ?? ''}
+                </Text>
+              }
+              before={
+                <Avatar size="200">
+                  {dm ? (
+                    <RoomAvatar
+                      roomId={room.roomId}
+                      src={getDirectRoomAvatarUrl(mx, room)}
+                      alt={room.name}
+                      renderFallback={() => (
+                        <RoomIcon
+                          size="50"
+                          joinRule={room.getJoinRule() ?? JoinRule.Restricted}
+                          filled
+                        />
+                      )}
+                    />
+                  ) : (
+                    <RoomIcon size="100" joinRule={room.getJoinRule()} space={room.isSpaceRoom()} />
+                  )}
+                </Avatar>
+              }
+            >
+              <Text style={{ flexGrow: 1 }} size="B400" truncate>
+                {room.name}
+              </Text>
+            </MenuItem>
+          );
+        })
+      )}
+    </AutocompleteMenu>
+  );
+}

src/app/components/editor/autocomplete/UserMentionAutocomplete.tsx

@@ -0,0 +1,181 @@
+import React, { useEffect, KeyboardEvent as ReactKeyboardEvent } from 'react';
+import { Editor } from 'slate';
+import { Avatar, Icon, Icons, MenuItem, Text } from 'folds';
+import { MatrixClient, Room, RoomMember } from 'matrix-js-sdk';
+
+import { AutocompleteQuery } from './autocompleteQuery';
+import { AutocompleteMenu } from './AutocompleteMenu';
+import { useRoomMembers } from '../../../hooks/useRoomMembers';
+import { useMatrixClient } from '../../../hooks/useMatrixClient';
+import {
+  SearchItemStrGetter,
+  UseAsyncSearchOptions,
+  useAsyncSearch,
+} from '../../../hooks/useAsyncSearch';
+import { onTabPress } from '../../../utils/keyboard';
+import { createMentionElement, moveCursor, replaceWithElement } from '../utils';
+import { useKeyDown } from '../../../hooks/useKeyDown';
+import { getMxIdLocalPart, getMxIdServer, validMxId } from '../../../utils/matrix';
+import { getMemberDisplayName, getMemberSearchStr } from '../../../utils/room';
+import { UserAvatar } from '../../user-avatar';
+
+type MentionAutoCompleteHandler = (userId: string, name: string) => void;
+
+const userIdFromQueryText = (mx: MatrixClient, text: string) =>
+  validMxId(`@${text}`)
+    ? `@${text}`
+    : `@${text}${text.endsWith(':') ? '' : ':'}${getMxIdServer(mx.getUserId() ?? '')}`;
+
+function UnknownMentionItem({
+  userId,
+  name,
+  handleAutocomplete,
+}: {
+  userId: string;
+  name: string;
+  handleAutocomplete: MentionAutoCompleteHandler;
+}) {
+  return (
+    <MenuItem
+      as="button"
+      radii="300"
+      onKeyDown={(evt: ReactKeyboardEvent<HTMLButtonElement>) =>
+        onTabPress(evt, () => handleAutocomplete(userId, name))
+      }
+      onClick={() => handleAutocomplete(userId, name)}
+      before={
+        <Avatar size="200">
+          <UserAvatar
+            userId={userId}
+            renderFallback={() => <Icon size="50" src={Icons.User} filled />}
+          />
+        </Avatar>
+      }
+    >
+      <Text style={{ flexGrow: 1 }} size="B400">
+        {name}
+      </Text>
+    </MenuItem>
+  );
+}
+
+type UserMentionAutocompleteProps = {
+  room: Room;
+  editor: Editor;
+  query: AutocompleteQuery<string>;
+  requestClose: () => void;
+};
+
+const SEARCH_OPTIONS: UseAsyncSearchOptions = {
+  limit: 20,
+  matchOptions: {
+    contain: true,
+  },
+};
+
+const mxIdToName = (mxId: string) => getMxIdLocalPart(mxId) ?? mxId;
+const getRoomMemberStr: SearchItemStrGetter<RoomMember> = (m, query) =>
+  getMemberSearchStr(m, query, mxIdToName);
+
+export function UserMentionAutocomplete({
+  room,
+  editor,
+  query,
+  requestClose,
+}: UserMentionAutocompleteProps) {
+  const mx = useMatrixClient();
+  const roomId: string = room.roomId!;
+  const roomAliasOrId = room.getCanonicalAlias() || roomId;
+  const members = useRoomMembers(mx, roomId);
+
+  const [result, search, resetSearch] = useAsyncSearch(members, getRoomMemberStr, SEARCH_OPTIONS);
+  const autoCompleteMembers = result ? result.items : members.slice(0, 20);
+
+  useEffect(() => {
+    if (query.text) search(query.text);
+    else resetSearch();
+  }, [query.text, search, resetSearch]);
+
+  const handleAutocomplete: MentionAutoCompleteHandler = (uId, name) => {
+    const mentionEl = createMentionElement(
+      uId,
+      name.startsWith('@') ? name : `@${name}`,
+      mx.getUserId() === uId || roomAliasOrId === uId
+    );
+    replaceWithElement(editor, query.range, mentionEl);
+    moveCursor(editor, true);
+    requestClose();
+  };
+
+  useKeyDown(window, (evt: KeyboardEvent) => {
+    onTabPress(evt, () => {
+      if (query.text === 'room') {
+        handleAutocomplete(roomAliasOrId, '@room');
+        return;
+      }
+      if (autoCompleteMembers.length === 0) {
+        const userId = userIdFromQueryText(mx, query.text);
+        handleAutocomplete(userId, userId);
+        return;
+      }
+      const roomMember = autoCompleteMembers[0];
+      handleAutocomplete(roomMember.userId, roomMember.name);
+    });
+  });
+
+  const getName = (member: RoomMember) =>
+    getMemberDisplayName(room, member.userId) ?? getMxIdLocalPart(member.userId) ?? member.userId;
+
+  return (
+    <AutocompleteMenu headerContent={<Text size="L400">Mentions</Text>} requestClose={requestClose}>
+      {query.text === 'room' && (
+        <UnknownMentionItem
+          userId={roomAliasOrId}
+          name="@room"
+          handleAutocomplete={handleAutocomplete}
+        />
+      )}
+      {autoCompleteMembers.length === 0 ? (
+        <UnknownMentionItem
+          userId={userIdFromQueryText(mx, query.text)}
+          name={userIdFromQueryText(mx, query.text)}
+          handleAutocomplete={handleAutocomplete}
+        />
+      ) : (
+        autoCompleteMembers.map((roomMember) => {
+          const avatarUrl = roomMember.getAvatarUrl(mx.baseUrl, 32, 32, 'crop', undefined, false);
+          return (
+            <MenuItem
+              key={roomMember.userId}
+              as="button"
+              radii="300"
+              onKeyDown={(evt: ReactKeyboardEvent<HTMLButtonElement>) =>
+                onTabPress(evt, () => handleAutocomplete(roomMember.userId, getName(roomMember)))
+              }
+              onClick={() => handleAutocomplete(roomMember.userId, getName(roomMember))}
+              after={
+                <Text size="T200" priority="300" truncate>
+                  {roomMember.userId}
+                </Text>
+              }
+              before={
+                <Avatar size="200">
+                  <UserAvatar
+                    userId={roomMember.userId}
+                    src={avatarUrl ?? undefined}
+                    alt={getName(roomMember)}
+                    renderFallback={() => <Icon size="50" src={Icons.User} filled />}
+                  />
+                </Avatar>
+              }
+            >
+              <Text style={{ flexGrow: 1 }} size="B400" truncate>
+                {getName(roomMember)}
+              </Text>
+            </MenuItem>
+          );
+        })
+      )}
+    </AutocompleteMenu>
+  );
+}

src/app/components/editor/autocomplete/autocompleteQuery.ts

@@ -0,0 +1,49 @@
+import { BaseRange, Editor } from 'slate';
+
+export enum AutocompletePrefix {
+  RoomMention = '#',
+  UserMention = '@',
+  Emoticon = ':',
+  Command = '/',
+}
+export const AUTOCOMPLETE_PREFIXES: readonly AutocompletePrefix[] = [
+  AutocompletePrefix.RoomMention,
+  AutocompletePrefix.UserMention,
+  AutocompletePrefix.Emoticon,
+  AutocompletePrefix.Command,
+];
+
+export type AutocompleteQuery<TPrefix extends string> = {
+  range: BaseRange;
+  prefix: TPrefix;
+  text: string;
+};
+
+export const getAutocompletePrefix = <TPrefix extends string>(
+  editor: Editor,
+  queryRange: BaseRange,
+  validPrefixes: readonly TPrefix[]
+): TPrefix | undefined => {
+  const world = Editor.string(editor, queryRange);
+  return validPrefixes.find((p) => world.startsWith(p));
+};
+
+export const getAutocompleteQueryText = (
+  editor: Editor,
+  queryRange: BaseRange,
+  prefix: string
+): string => Editor.string(editor, queryRange).slice(prefix.length);
+
+export const getAutocompleteQuery = <TPrefix extends string>(
+  editor: Editor,
+  queryRange: BaseRange,
+  validPrefixes: readonly TPrefix[]
+): AutocompleteQuery<TPrefix> | undefined => {
+  const prefix = getAutocompletePrefix(editor, queryRange, validPrefixes);
+  if (!prefix) return undefined;
+  return {
+    range: queryRange,
+    prefix,
+    text: getAutocompleteQueryText(editor, queryRange, prefix),
+  };
+};

src/app/components/editor/autocomplete/index.ts

@@ -0,0 +1,5 @@
+export * from './AutocompleteMenu';
+export * from './autocompleteQuery';
+export * from './RoomMentionAutocomplete';
+export * from './UserMentionAutocomplete';
+export * from './EmoticonAutocomplete';

src/app/components/editor/index.ts

@@ -0,0 +1,9 @@
+export * from './autocomplete';
+export * from './utils';
+export * from './Editor';
+export * from './Elements';
+export * from './keyboard';
+export * from './output';
+export * from './Toolbar';
+export * from './input';
+export * from './types';

src/app/components/editor/input.ts

@@ -0,0 +1,413 @@
+/* eslint-disable no-param-reassign */
+import { Descendant, Text } from 'slate';
+import parse from 'html-dom-parser';
+import { ChildNode, Element, isText, isTag } from 'domhandler';
+
+import { sanitizeCustomHtml } from '../../utils/sanitize';
+import { BlockType, MarkType } from './types';
+import {
+  BlockQuoteElement,
+  CodeBlockElement,
+  CodeLineElement,
+  EmoticonElement,
+  HeadingElement,
+  HeadingLevel,
+  InlineElement,
+  MentionElement,
+  OrderedListElement,
+  ParagraphElement,
+  UnorderedListElement,
+} from './slate';
+import { createEmoticonElement, createMentionElement } from './utils';
+import {
+  parseMatrixToRoom,
+  parseMatrixToRoomEvent,
+  parseMatrixToUser,
+  testMatrixTo,
+} from '../../plugins/matrix-to';
+import { tryDecodeURIComponent } from '../../utils/dom';
+
+const markNodeToType: Record<string, MarkType> = {
+  b: MarkType.Bold,
+  strong: MarkType.Bold,
+  i: MarkType.Italic,
+  em: MarkType.Italic,
+  u: MarkType.Underline,
+  s: MarkType.StrikeThrough,
+  del: MarkType.StrikeThrough,
+  code: MarkType.Code,
+  span: MarkType.Spoiler,
+};
+
+const elementToTextMark = (node: Element): MarkType | undefined => {
+  const markType = markNodeToType[node.name];
+  if (!markType) return undefined;
+
+  if (markType === MarkType.Spoiler && node.attribs['data-mx-spoiler'] === undefined) {
+    return undefined;
+  }
+  if (
+    markType === MarkType.Code &&
+    node.parent &&
+    'name' in node.parent &&
+    node.parent.name === 'pre'
+  ) {
+    return undefined;
+  }
+  return markType;
+};
+
+const parseNodeText = (node: ChildNode): string => {
+  if (isText(node)) {
+    return node.data;
+  }
+  if (isTag(node)) {
+    return node.children.map((child) => parseNodeText(child)).join('');
+  }
+  return '';
+};
+
+const elementToInlineNode = (node: Element): MentionElement | EmoticonElement | undefined => {
+  if (node.name === 'img' && node.attribs['data-mx-emoticon'] !== undefined) {
+    const { src, alt } = node.attribs;
+    if (!src) return undefined;
+    return createEmoticonElement(src, alt || 'Unknown Emoji');
+  }
+  if (node.name === 'a') {
+    const href = tryDecodeURIComponent(node.attribs.href);
+    if (typeof href !== 'string') return undefined;
+    if (testMatrixTo(href)) {
+      const userMention = parseMatrixToUser(href);
+      if (userMention) {
+        return createMentionElement(userMention, parseNodeText(node) || userMention, false);
+      }
+      const roomMention = parseMatrixToRoom(href);
+      if (roomMention) {
+        return createMentionElement(
+          roomMention.roomIdOrAlias,
+          parseNodeText(node) || roomMention.roomIdOrAlias,
+          false,
+          undefined,
+          roomMention.viaServers
+        );
+      }
+      const eventMention = parseMatrixToRoomEvent(href);
+      if (eventMention) {
+        return createMentionElement(
+          eventMention.roomIdOrAlias,
+          parseNodeText(node) || eventMention.roomIdOrAlias,
+          false,
+          eventMention.eventId,
+          eventMention.viaServers
+        );
+      }
+    }
+  }
+  return undefined;
+};
+
+const parseInlineNodes = (node: ChildNode): InlineElement[] => {
+  if (isText(node)) {
+    return [{ text: node.data }];
+  }
+  if (isTag(node)) {
+    const markType = elementToTextMark(node);
+    if (markType) {
+      const children = node.children.flatMap(parseInlineNodes);
+      if (node.attribs['data-md'] !== undefined) {
+        children.unshift({ text: node.attribs['data-md'] });
+        children.push({ text: node.attribs['data-md'] });
+      } else {
+        children.forEach((child) => {
+          if (Text.isText(child)) {
+            child[markType] = true;
+          }
+        });
+      }
+      return children;
+    }
+
+    const inlineNode = elementToInlineNode(node);
+    if (inlineNode) return [inlineNode];
+
+    if (node.name === 'a') {
+      const children = node.childNodes.flatMap(parseInlineNodes);
+      children.unshift({ text: '[' });
+      children.push({ text: `](${node.attribs.href})` });
+      return children;
+    }
+
+    return node.childNodes.flatMap(parseInlineNodes);
+  }
+
+  return [];
+};
+
+const parseBlockquoteNode = (node: Element): BlockQuoteElement[] | ParagraphElement[] => {
+  const quoteLines: Array<InlineElement[]> = [];
+  let lineHolder: InlineElement[] = [];
+
+  const appendLine = () => {
+    if (lineHolder.length === 0) return;
+
+    quoteLines.push(lineHolder);
+    lineHolder = [];
+  };
+
+  node.children.forEach((child) => {
+    if (isText(child)) {
+      lineHolder.push({ text: child.data });
+      return;
+    }
+    if (isTag(child)) {
+      if (child.name === 'br') {
+        lineHolder.push({ text: '' });
+        appendLine();
+        return;
+      }
+
+      if (child.name === 'p') {
+        appendLine();
+        quoteLines.push(child.children.flatMap((c) => parseInlineNodes(c)));
+        return;
+      }
+
+      parseInlineNodes(child).forEach((inlineNode) => lineHolder.push(inlineNode));
+    }
+  });
+  appendLine();
+
+  if (node.attribs['data-md'] !== undefined) {
+    return quoteLines.map((lineChildren) => ({
+      type: BlockType.Paragraph,
+      children: [{ text: `${node.attribs['data-md']} ` }, ...lineChildren],
+    }));
+  }
+
+  return [
+    {
+      type: BlockType.BlockQuote,
+      children: quoteLines.map((lineChildren) => ({
+        type: BlockType.QuoteLine,
+        children: lineChildren,
+      })),
+    },
+  ];
+};
+const parseCodeBlockNode = (node: Element): CodeBlockElement[] | ParagraphElement[] => {
+  const codeLines = parseNodeText(node).trim().split('\n');
+
+  if (node.attribs['data-md'] !== undefined) {
+    const pLines = codeLines.map<ParagraphElement>((lineText) => ({
+      type: BlockType.Paragraph,
+      children: [
+        {
+          text: lineText,
+        },
+      ],
+    }));
+    const childCode = node.children[0];
+    const className =
+      isTag(childCode) && childCode.tagName === 'code' ? childCode.attribs.class ?? '' : '';
+    const prefix = { text: `${node.attribs['data-md']}${className.replace('language-', '')}` };
+    const suffix = { text: node.attribs['data-md'] };
+    return [
+      { type: BlockType.Paragraph, children: [prefix] },
+      ...pLines,
+      { type: BlockType.Paragraph, children: [suffix] },
+    ];
+  }
+
+  return [
+    {
+      type: BlockType.CodeBlock,
+      children: codeLines.map<CodeLineElement>((lineTxt) => ({
+        type: BlockType.CodeLine,
+        children: [
+          {
+            text: lineTxt,
+          },
+        ],
+      })),
+    },
+  ];
+};
+const parseListNode = (
+  node: Element
+): OrderedListElement[] | UnorderedListElement[] | ParagraphElement[] => {
+  const listLines: Array<InlineElement[]> = [];
+  let lineHolder: InlineElement[] = [];
+
+  const appendLine = () => {
+    if (lineHolder.length === 0) return;
+
+    listLines.push(lineHolder);
+    lineHolder = [];
+  };
+
+  node.children.forEach((child) => {
+    if (isText(child)) {
+      lineHolder.push({ text: child.data });
+      return;
+    }
+    if (isTag(child)) {
+      if (child.name === 'br') {
+        lineHolder.push({ text: '' });
+        appendLine();
+        return;
+      }
+
+      if (child.name === 'li') {
+        appendLine();
+        listLines.push(child.children.flatMap((c) => parseInlineNodes(c)));
+        return;
+      }
+
+      parseInlineNodes(child).forEach((inlineNode) => lineHolder.push(inlineNode));
+    }
+  });
+  appendLine();
+
+  if (node.attribs['data-md'] !== undefined) {
+    const prefix = node.attribs['data-md'] || '-';
+    const [starOrHyphen] = prefix.match(/^\*|-$/) ?? [];
+    return listLines.map((lineChildren) => ({
+      type: BlockType.Paragraph,
+      children: [
+        { text: `${starOrHyphen ? `${starOrHyphen} ` : `${prefix}. `} ` },
+        ...lineChildren,
+      ],
+    }));
+  }
+
+  if (node.name === 'ol') {
+    return [
+      {
+        type: BlockType.OrderedList,
+        children: listLines.map((lineChildren) => ({
+          type: BlockType.ListItem,
+          children: lineChildren,
+        })),
+      },
+    ];
+  }
+
+  return [
+    {
+      type: BlockType.UnorderedList,
+      children: listLines.map((lineChildren) => ({
+        type: BlockType.ListItem,
+        children: lineChildren,
+      })),
+    },
+  ];
+};
+const parseHeadingNode = (node: Element): HeadingElement | ParagraphElement => {
+  const children = node.children.flatMap((child) => parseInlineNodes(child));
+
+  const headingMatch = node.name.match(/^h([123456])$/);
+  const [, g1AsLevel] = headingMatch ?? ['h3', '3'];
+  const level = parseInt(g1AsLevel, 10);
+
+  if (node.attribs['data-md'] !== undefined) {
+    return {
+      type: BlockType.Paragraph,
+      children: [{ text: `${node.attribs['data-md']} ` }, ...children],
+    };
+  }
+
+  return {
+    type: BlockType.Heading,
+    level: (level <= 3 ? level : 3) as HeadingLevel,
+    children,
+  };
+};
+
+export const domToEditorInput = (domNodes: ChildNode[]): Descendant[] => {
+  const children: Descendant[] = [];
+
+  let lineHolder: InlineElement[] = [];
+
+  const appendLine = () => {
+    if (lineHolder.length === 0) return;
+
+    children.push({
+      type: BlockType.Paragraph,
+      children: lineHolder,
+    });
+    lineHolder = [];
+  };
+
+  domNodes.forEach((node) => {
+    if (isText(node)) {
+      lineHolder.push({ text: node.data });
+      return;
+    }
+    if (isTag(node)) {
+      if (node.name === 'br') {
+        lineHolder.push({ text: '' });
+        appendLine();
+        return;
+      }
+
+      if (node.name === 'p') {
+        appendLine();
+        children.push({
+          type: BlockType.Paragraph,
+          children: node.children.flatMap((child) => parseInlineNodes(child)),
+        });
+        return;
+      }
+
+      if (node.name === 'blockquote') {
+        appendLine();
+        children.push(...parseBlockquoteNode(node));
+        return;
+      }
+      if (node.name === 'pre') {
+        appendLine();
+        children.push(...parseCodeBlockNode(node));
+        return;
+      }
+      if (node.name === 'ol' || node.name === 'ul') {
+        appendLine();
+        children.push(...parseListNode(node));
+        return;
+      }
+
+      if (node.name.match(/^h[123456]$/)) {
+        appendLine();
+        children.push(parseHeadingNode(node));
+        return;
+      }
+
+      parseInlineNodes(node).forEach((inlineNode) => lineHolder.push(inlineNode));
+    }
+  });
+  appendLine();
+
+  return children;
+};
+
+export const htmlToEditorInput = (unsafeHtml: string): Descendant[] => {
+  const sanitizedHtml = sanitizeCustomHtml(unsafeHtml);
+
+  const domNodes = parse(sanitizedHtml);
+  const editorNodes = domToEditorInput(domNodes);
+  return editorNodes;
+};
+
+export const plainToEditorInput = (text: string): Descendant[] => {
+  const editorNodes: Descendant[] = text.split('\n').map((lineText) => {
+    const paragraphNode: ParagraphElement = {
+      type: BlockType.Paragraph,
+      children: [
+        {
+          text: lineText,
+        },
+      ],
+    };
+    return paragraphNode;
+  });
+  return editorNodes;
+};

src/app/components/editor/keyboard.ts

@@ -0,0 +1,116 @@
+import { isKeyHotkey } from 'is-hotkey';
+import { KeyboardEvent } from 'react';
+import { Editor, Element as SlateElement, Range, Transforms } from 'slate';
+import { isAnyMarkActive, isBlockActive, removeAllMark, toggleBlock, toggleMark } from './utils';
+import { BlockType, MarkType } from './types';
+
+export const INLINE_HOTKEYS: Record<string, MarkType> = {
+  'mod+b': MarkType.Bold,
+  'mod+i': MarkType.Italic,
+  'mod+u': MarkType.Underline,
+  'mod+s': MarkType.StrikeThrough,
+  'mod+[': MarkType.Code,
+  'mod+h': MarkType.Spoiler,
+};
+const INLINE_KEYS = Object.keys(INLINE_HOTKEYS);
+
+export const BLOCK_HOTKEYS: Record<string, BlockType> = {
+  'mod+7': BlockType.OrderedList,
+  'mod+8': BlockType.UnorderedList,
+  "mod+'": BlockType.BlockQuote,
+  'mod+;': BlockType.CodeBlock,
+};
+const BLOCK_KEYS = Object.keys(BLOCK_HOTKEYS);
+const isHeading1 = isKeyHotkey('mod+1');
+const isHeading2 = isKeyHotkey('mod+2');
+const isHeading3 = isKeyHotkey('mod+3');
+
+/**
+ * @return boolean true if shortcut is toggled.
+ */
+export const toggleKeyboardShortcut = (editor: Editor, event: KeyboardEvent<Element>): boolean => {
+  if (isKeyHotkey('backspace', event) && editor.selection && Range.isCollapsed(editor.selection)) {
+    const startPoint = Range.start(editor.selection);
+    if (startPoint.offset !== 0) return false;
+
+    const [parentNode, parentPath] = Editor.parent(editor, startPoint);
+    const parentLocation = { at: parentPath };
+    const [previousNode] = Editor.previous(editor, parentLocation) ?? [];
+    const [nextNode] = Editor.next(editor, parentLocation) ?? [];
+
+    if (Editor.isEditor(parentNode)) return false;
+
+    if (parentNode.type === BlockType.Heading) {
+      toggleBlock(editor, BlockType.Paragraph);
+      return true;
+    }
+    if (
+      parentNode.type === BlockType.CodeLine ||
+      parentNode.type === BlockType.QuoteLine ||
+      parentNode.type === BlockType.ListItem
+    ) {
+      // exit formatting only when line block
+      // is first of last of it's parent
+      if (!previousNode || !nextNode) {
+        toggleBlock(editor, BlockType.Paragraph);
+        return true;
+      }
+    }
+    // Unwrap paragraph children to put them
+    // in previous none paragraph element
+    if (SlateElement.isElement(previousNode) && previousNode.type !== BlockType.Paragraph) {
+      Transforms.unwrapNodes(editor, {
+        at: startPoint,
+      });
+    }
+    Editor.deleteBackward(editor);
+    return true;
+  }
+
+  if (isKeyHotkey('mod+e', event) || isKeyHotkey('escape', event)) {
+    if (isAnyMarkActive(editor)) {
+      removeAllMark(editor);
+      return true;
+    }
+
+    if (!isBlockActive(editor, BlockType.Paragraph)) {
+      toggleBlock(editor, BlockType.Paragraph);
+      return true;
+    }
+    return false;
+  }
+
+  const blockToggled = BLOCK_KEYS.find((hotkey) => {
+    if (isKeyHotkey(hotkey, event)) {
+      event.preventDefault();
+      toggleBlock(editor, BLOCK_HOTKEYS[hotkey]);
+      return true;
+    }
+    return false;
+  });
+  if (blockToggled) return true;
+  if (isHeading1(event)) {
+    toggleBlock(editor, BlockType.Heading, { level: 1 });
+    return true;
+  }
+  if (isHeading2(event)) {
+    toggleBlock(editor, BlockType.Heading, { level: 2 });
+    return true;
+  }
+  if (isHeading3(event)) {
+    toggleBlock(editor, BlockType.Heading, { level: 3 });
+    return true;
+  }
+
+  const inlineToggled = isBlockActive(editor, BlockType.CodeBlock)
+    ? false
+    : INLINE_KEYS.find((hotkey) => {
+        if (isKeyHotkey(hotkey, event)) {
+          event.preventDefault();
+          toggleMark(editor, INLINE_HOTKEYS[hotkey]);
+          return true;
+        }
+        return false;
+      });
+  return !!inlineToggled;
+};

src/app/components/editor/output.ts

@@ -0,0 +1,187 @@
+import { Descendant, Text } from 'slate';
+
+import { sanitizeText } from '../../utils/sanitize';
+import { BlockType } from './types';
+import { CustomElement } from './slate';
+import { parseBlockMD, parseInlineMD } from '../../plugins/markdown';
+import { findAndReplace } from '../../utils/findAndReplace';
+
+export type OutputOptions = {
+  allowTextFormatting?: boolean;
+  allowInlineMarkdown?: boolean;
+  allowBlockMarkdown?: boolean;
+};
+
+const textToCustomHtml = (node: Text, opts: OutputOptions): string => {
+  let string = sanitizeText(node.text);
+  if (opts.allowTextFormatting) {
+    if (node.bold) string = `<strong>${string}</strong>`;
+    if (node.italic) string = `<i>${string}</i>`;
+    if (node.underline) string = `<u>${string}</u>`;
+    if (node.strikeThrough) string = `<del>${string}</del>`;
+    if (node.code) string = `<code>${string}</code>`;
+    if (node.spoiler) string = `<span data-mx-spoiler>${string}</span>`;
+  }
+
+  if (opts.allowInlineMarkdown && string === sanitizeText(node.text)) {
+    string = parseInlineMD(string);
+  }
+
+  return string;
+};
+
+const elementToCustomHtml = (node: CustomElement, children: string): string => {
+  switch (node.type) {
+    case BlockType.Paragraph:
+      return `${children}<br/>`;
+    case BlockType.Heading:
+      return `<h${node.level}>${children}</h${node.level}>`;
+    case BlockType.CodeLine:
+      return `${children}\n`;
+    case BlockType.CodeBlock:
+      return `<pre><code>${children}</code></pre>`;
+    case BlockType.QuoteLine:
+      return `${children}<br/>`;
+    case BlockType.BlockQuote:
+      return `<blockquote>${children}</blockquote>`;
+    case BlockType.ListItem:
+      return `<li><p>${children}</p></li>`;
+    case BlockType.OrderedList:
+      return `<ol>${children}</ol>`;
+    case BlockType.UnorderedList:
+      return `<ul>${children}</ul>`;
+
+    case BlockType.Mention: {
+      let fragment = node.id;
+
+      if (node.eventId) {
+        fragment += `/${node.eventId}`;
+      }
+      if (node.viaServers && node.viaServers.length > 0) {
+        fragment += `?${node.viaServers.map((server) => `via=${server}`).join('&')}`;
+      }
+
+      const matrixTo = `https://matrix.to/#/${fragment}`;
+      return `<a href="${encodeURIComponent(matrixTo)}">${sanitizeText(node.name)}</a>`;
+    }
+    case BlockType.Emoticon:
+      return node.key.startsWith('mxc://')
+        ? `<img data-mx-emoticon src="${node.key}" alt="${sanitizeText(
+            node.shortcode
+          )}" title="${sanitizeText(node.shortcode)}" height="32" />`
+        : sanitizeText(node.key);
+    case BlockType.Link:
+      return `<a href="${encodeURIComponent(node.href)}">${node.children}</a>`;
+    case BlockType.Command:
+      return `/${sanitizeText(node.command)}`;
+    default:
+      return children;
+  }
+};
+
+const HTML_TAG_REG_G = /<([\w-]+)(?: [^>]*)?(?:(?:\/>)|(?:>.*?<\/\1>))/g;
+const ignoreHTMLParseInlineMD = (text: string): string =>
+  findAndReplace(
+    text,
+    HTML_TAG_REG_G,
+    (match) => match[0],
+    (txt) => parseInlineMD(txt)
+  ).join('');
+
+export const toMatrixCustomHTML = (
+  node: Descendant | Descendant[],
+  opts: OutputOptions
+): string => {
+  let markdownLines = '';
+  const parseNode = (n: Descendant, index: number, targetNodes: Descendant[]) => {
+    if (opts.allowBlockMarkdown && 'type' in n && n.type === BlockType.Paragraph) {
+      const line = toMatrixCustomHTML(n, {
+        ...opts,
+        allowInlineMarkdown: false,
+        allowBlockMarkdown: false,
+      })
+        .replace(/<br\/>$/, '\n')
+        .replace(/^&gt;/, '>');
+      markdownLines += line;
+      if (index === targetNodes.length - 1) {
+        return parseBlockMD(markdownLines, ignoreHTMLParseInlineMD);
+      }
+      return '';
+    }
+
+    const parsedMarkdown = parseBlockMD(markdownLines, ignoreHTMLParseInlineMD);
+    markdownLines = '';
+    const isCodeLine = 'type' in n && n.type === BlockType.CodeLine;
+    if (isCodeLine) return `${parsedMarkdown}${toMatrixCustomHTML(n, {})}`;
+
+    return `${parsedMarkdown}${toMatrixCustomHTML(n, { ...opts, allowBlockMarkdown: false })}`;
+  };
+  if (Array.isArray(node)) return node.map(parseNode).join('');
+  if (Text.isText(node)) return textToCustomHtml(node, opts);
+
+  const children = node.children.map(parseNode).join('');
+  return elementToCustomHtml(node, children);
+};
+
+const elementToPlainText = (node: CustomElement, children: string): string => {
+  switch (node.type) {
+    case BlockType.Paragraph:
+      return `${children}\n`;
+    case BlockType.Heading:
+      return `${children}\n`;
+    case BlockType.CodeLine:
+      return `${children}\n`;
+    case BlockType.CodeBlock:
+      return `${children}\n`;
+    case BlockType.QuoteLine:
+      return `| ${children}\n`;
+    case BlockType.BlockQuote:
+      return `${children}\n`;
+    case BlockType.ListItem:
+      return `- ${children}\n`;
+    case BlockType.OrderedList:
+      return `${children}\n`;
+    case BlockType.UnorderedList:
+      return `${children}\n`;
+    case BlockType.Mention:
+      return node.id;
+    case BlockType.Emoticon:
+      return node.key.startsWith('mxc://') ? `:${node.shortcode}:` : node.key;
+    case BlockType.Link:
+      return `[${node.children}](${node.href})`;
+    case BlockType.Command:
+      return `/${node.command}`;
+    default:
+      return children;
+  }
+};
+
+export const toPlainText = (node: Descendant | Descendant[]): string => {
+  if (Array.isArray(node)) return node.map((n) => toPlainText(n)).join('');
+  if (Text.isText(node)) return node.text;
+
+  const children = node.children.map((n) => toPlainText(n)).join('');
+  return elementToPlainText(node, children);
+};
+
+/**
+ * Check if customHtml is equals to plainText
+ * by replacing `<br/>` with `/n` in customHtml
+ * and sanitizing plainText before comparison
+ * because text are sanitized in customHtml
+ * @param customHtml string
+ * @param plain string
+ * @returns boolean
+ */
+export const customHtmlEqualsPlainText = (customHtml: string, plain: string): boolean =>
+  customHtml.replace(/<br\/>/g, '\n') === sanitizeText(plain);
+
+export const trimCustomHtml = (customHtml: string) => customHtml.replace(/<br\/>$/g, '').trim();
+
+export const trimCommand = (cmdName: string, str: string) => {
+  const cmdRegX = new RegExp(`^(\\s+)?(\\/${cmdName})([^\\S\n]+)?`);
+
+  const match = str.match(cmdRegX);
+  if (!match) return str;
+  return str.slice(match[0].length);
+};

src/app/components/editor/slate.d.ts

@@ -0,0 +1,111 @@
+import { BaseEditor } from 'slate';
+import { ReactEditor } from 'slate-react';
+import { HistoryEditor } from 'slate-history';
+import { BlockType } from './types';
+
+export type HeadingLevel = 1 | 2 | 3;
+
+export type Editor = BaseEditor & HistoryEditor & ReactEditor;
+
+export type Text = {
+  text: string;
+};
+
+export type FormattedText = Text & {
+  bold?: boolean;
+  italic?: boolean;
+  underline?: boolean;
+  strikeThrough?: boolean;
+  code?: boolean;
+  spoiler?: boolean;
+};
+
+export type LinkElement = {
+  type: BlockType.Link;
+  href: string;
+  children: Text[];
+};
+
+export type MentionElement = {
+  type: BlockType.Mention;
+  id: string;
+  eventId?: string;
+  viaServers?: string[];
+  highlight: boolean;
+  name: string;
+  children: Text[];
+};
+export type EmoticonElement = {
+  type: BlockType.Emoticon;
+  key: string;
+  shortcode: string;
+  children: Text[];
+};
+export type CommandElement = {
+  type: BlockType.Command;
+  command: string;
+  children: Text[];
+};
+
+export type InlineElement = Text | LinkElement | MentionElement | EmoticonElement | CommandElement;
+
+export type ParagraphElement = {
+  type: BlockType.Paragraph;
+  children: InlineElement[];
+};
+export type HeadingElement = {
+  type: BlockType.Heading;
+  level: HeadingLevel;
+  children: InlineElement[];
+};
+export type CodeLineElement = {
+  type: BlockType.CodeLine;
+  children: Text[];
+};
+export type CodeBlockElement = {
+  type: BlockType.CodeBlock;
+  children: CodeLineElement[];
+};
+export type QuoteLineElement = {
+  type: BlockType.QuoteLine;
+  children: InlineElement[];
+};
+export type BlockQuoteElement = {
+  type: BlockType.BlockQuote;
+  children: QuoteLineElement[];
+};
+export type ListItemElement = {
+  type: BlockType.ListItem;
+  children: InlineElement[];
+};
+export type OrderedListElement = {
+  type: BlockType.OrderedList;
+  children: ListItemElement[];
+};
+export type UnorderedListElement = {
+  type: BlockType.UnorderedList;
+  children: ListItemElement[];
+};
+
+export type CustomElement =
+  | LinkElement
+  | MentionElement
+  | EmoticonElement
+  | CommandElement
+  | ParagraphElement
+  | HeadingElement
+  | CodeLineElement
+  | CodeBlockElement
+  | QuoteLineElement
+  | BlockQuoteElement
+  | ListItemElement
+  | OrderedListElement
+  | UnorderedListElement;
+
+declare module 'slate' {
+  interface CustomTypes {
+    Editor: Editor;
+    Element: CustomElement;
+    Text: FormattedText & Text;
+  }
+}

src/app/components/editor/types.ts

@@ -0,0 +1,24 @@
+export enum MarkType {
+  Bold = 'bold',
+  Italic = 'italic',
+  Underline = 'underline',
+  StrikeThrough = 'strikeThrough',
+  Code = 'code',
+  Spoiler = 'spoiler',
+}
+
+export enum BlockType {
+  Paragraph = 'paragraph',
+  Heading = 'heading',
+  CodeLine = 'code-line',
+  CodeBlock = 'code-block',
+  QuoteLine = 'quote-line',
+  BlockQuote = 'block-quote',
+  ListItem = 'list-item',
+  OrderedList = 'ordered-list',
+  UnorderedList = 'unordered-list',
+  Mention = 'mention',
+  Emoticon = 'emoticon',
+  Link = 'link',
+  Command = 'command',
+}

src/app/components/editor/utils.ts

@@ -0,0 +1,275 @@
+import { BasePoint, BaseRange, Editor, Element, Point, Range, Text, Transforms } from 'slate';
+import { BlockType, MarkType } from './types';
+import {
+  CommandElement,
+  EmoticonElement,
+  FormattedText,
+  HeadingLevel,
+  LinkElement,
+  MentionElement,
+} from './slate';
+
+const ALL_MARK_TYPE: MarkType[] = [
+  MarkType.Bold,
+  MarkType.Code,
+  MarkType.Italic,
+  MarkType.Spoiler,
+  MarkType.StrikeThrough,
+  MarkType.Underline,
+];
+
+export const isMarkActive = (editor: Editor, format: MarkType) => {
+  const marks = Editor.marks(editor);
+  return marks ? marks[format] === true : false;
+};
+
+export const isAnyMarkActive = (editor: Editor) => {
+  const marks = Editor.marks(editor);
+  return marks && !!ALL_MARK_TYPE.find((type) => marks[type] === true);
+};
+
+export const toggleMark = (editor: Editor, format: MarkType) => {
+  const isActive = isMarkActive(editor, format);
+
+  if (isActive) {
+    Editor.removeMark(editor, format);
+  } else {
+    Editor.addMark(editor, format, true);
+  }
+};
+
+export const removeAllMark = (editor: Editor) => {
+  ALL_MARK_TYPE.forEach((mark) => {
+    if (isMarkActive(editor, mark)) Editor.removeMark(editor, mark);
+  });
+};
+
+export const isBlockActive = (editor: Editor, format: BlockType) => {
+  const [match] = Editor.nodes(editor, {
+    match: (node) => Element.isElement(node) && node.type === format,
+  });
+
+  return !!match;
+};
+
+export const headingLevel = (editor: Editor): HeadingLevel | undefined => {
+  const [nodeEntry] = Editor.nodes(editor, {
+    match: (node) => Element.isElement(node) && node.type === BlockType.Heading,
+  });
+  const [node] = nodeEntry ?? [];
+  if (!node) return undefined;
+  if ('level' in node) return node.level;
+  return undefined;
+};
+
+type BlockOption = { level: HeadingLevel };
+const NESTED_BLOCK = [
+  BlockType.OrderedList,
+  BlockType.UnorderedList,
+  BlockType.BlockQuote,
+  BlockType.CodeBlock,
+];
+
+export const toggleBlock = (editor: Editor, format: BlockType, option?: BlockOption) => {
+  Transforms.collapse(editor, {
+    edge: 'end',
+  });
+  const isActive = isBlockActive(editor, format);
+
+  Transforms.unwrapNodes(editor, {
+    match: (node) => Element.isElement(node) && NESTED_BLOCK.includes(node.type),
+    split: true,
+  });
+
+  if (isActive) {
+    Transforms.setNodes(editor, {
+      type: BlockType.Paragraph,
+    });
+    return;
+  }
+
+  if (format === BlockType.OrderedList || format === BlockType.UnorderedList) {
+    Transforms.setNodes(editor, {
+      type: BlockType.ListItem,
+    });
+    const block = {
+      type: format,
+      children: [],
+    };
+    Transforms.wrapNodes(editor, block);
+    return;
+  }
+  if (format === BlockType.CodeBlock) {
+    Transforms.setNodes(editor, {
+      type: BlockType.CodeLine,
+    });
+    const block = {
+      type: format,
+      children: [],
+    };
+    Transforms.wrapNodes(editor, block);
+    return;
+  }
+
+  if (format === BlockType.BlockQuote) {
+    Transforms.setNodes(editor, {
+      type: BlockType.QuoteLine,
+    });
+    const block = {
+      type: format,
+      children: [],
+    };
+    Transforms.wrapNodes(editor, block);
+    return;
+  }
+
+  if (format === BlockType.Heading) {
+    Transforms.setNodes(editor, {
+      type: format,
+      level: option?.level ?? 1,
+    });
+  }
+
+  Transforms.setNodes(editor, {
+    type: format,
+  });
+};
+
+export const resetEditor = (editor: Editor) => {
+  Transforms.delete(editor, {
+    at: {
+      anchor: Editor.start(editor, []),
+      focus: Editor.end(editor, []),
+    },
+  });
+
+  toggleBlock(editor, BlockType.Paragraph);
+  removeAllMark(editor);
+};
+
+export const resetEditorHistory = (editor: Editor) => {
+  // eslint-disable-next-line no-param-reassign
+  editor.history = {
+    undos: [],
+    redos: [],
+  };
+};
+
+export const createMentionElement = (
+  id: string,
+  name: string,
+  highlight: boolean,
+  eventId?: string,
+  viaServers?: string[]
+): MentionElement => ({
+  type: BlockType.Mention,
+  id,
+  eventId,
+  viaServers,
+  highlight,
+  name,
+  children: [{ text: '' }],
+});
+
+export const createEmoticonElement = (key: string, shortcode: string): EmoticonElement => ({
+  type: BlockType.Emoticon,
+  key,
+  shortcode,
+  children: [{ text: '' }],
+});
+
+export const createLinkElement = (
+  href: string,
+  children: string | FormattedText[]
+): LinkElement => ({
+  type: BlockType.Link,
+  href,
+  children: typeof children === 'string' ? [{ text: children }] : children,
+});
+
+export const createCommandElement = (command: string): CommandElement => ({
+  type: BlockType.Command,
+  command,
+  children: [{ text: '' }],
+});
+
+export const replaceWithElement = (editor: Editor, selectRange: BaseRange, element: Element) => {
+  Transforms.select(editor, selectRange);
+  Transforms.insertNodes(editor, element);
+  Transforms.collapse(editor, {
+    edge: 'end',
+  });
+};
+
+export const moveCursor = (editor: Editor, withSpace?: boolean) => {
+  Transforms.move(editor);
+  if (withSpace) editor.insertText(' ');
+};
+
+interface PointUntilCharOptions {
+  match: (char: string) => boolean;
+  reverse?: boolean;
+}
+export const getPointUntilChar = (
+  editor: Editor,
+  cursorPoint: BasePoint,
+  options: PointUntilCharOptions
+): BasePoint | undefined => {
+  let targetPoint: BasePoint | undefined;
+  let prevPoint: BasePoint | undefined;
+  let char: string | undefined;
+
+  const pointItr = Editor.positions(editor, {
+    at: {
+      anchor: Editor.start(editor, []),
+      focus: Editor.point(editor, cursorPoint, { edge: 'start' }),
+    },
+    unit: 'character',
+    reverse: options.reverse,
+  });
+
+  // eslint-disable-next-line no-restricted-syntax
+  for (const point of pointItr) {
+    if (!Point.equals(point, cursorPoint) && prevPoint) {
+      char = Editor.string(editor, { anchor: point, focus: prevPoint });
+
+      if (options.match(char)) break;
+      targetPoint = point;
+    }
+    prevPoint = point;
+  }
+  return targetPoint;
+};
+
+export const getPrevWorldRange = (editor: Editor): BaseRange | undefined => {
+  const { selection } = editor;
+  if (!selection || !Range.isCollapsed(selection)) return undefined;
+  const [cursorPoint] = Range.edges(selection);
+  const worldStartPoint = getPointUntilChar(editor, cursorPoint, {
+    reverse: true,
+    match: (char) => char === ' ',
+  });
+  return worldStartPoint && Editor.range(editor, worldStartPoint, cursorPoint);
+};
+
+export const isEmptyEditor = (editor: Editor): boolean => {
+  const firstChildren = editor.children[0];
+  if (firstChildren && Element.isElement(firstChildren)) {
+    const isEmpty = editor.children.length === 1 && Editor.isEmpty(editor, firstChildren);
+    return isEmpty;
+  }
+  return false;
+};
+
+export const getBeginCommand = (editor: Editor): string | undefined => {
+  const lineBlock = editor.children[0];
+  if (!Element.isElement(lineBlock)) return undefined;
+  if (lineBlock.type !== BlockType.Paragraph) return undefined;
+
+  const [firstInline, secondInline] = lineBlock.children;
+  const isEmptyText = Text.isText(firstInline) && firstInline.text.trim() === '';
+  if (!isEmptyText) return undefined;
+  if (Element.isElement(secondInline) && secondInline.type === BlockType.Command)
+    return secondInline.command;
+  return undefined;
+};

src/app/components/emoji-board/EmojiBoard.css.tsx

@@ -0,0 +1,136 @@
+import { style } from '@vanilla-extract/css';
+import { DefaultReset, FocusOutline, color, config, toRem } from 'folds';
+
+export const Base = style({
+  maxWidth: toRem(432),
+  width: `calc(100vw - 2 * ${config.space.S400})`,
+  height: toRem(450),
+  backgroundColor: color.Surface.Container,
+  color: color.Surface.OnContainer,
+  border: `${config.borderWidth.B300} solid ${color.Surface.ContainerLine}`,
+  borderRadius: config.radii.R400,
+  boxShadow: config.shadow.E200,
+  overflow: 'hidden',
+});
+
+export const Sidebar = style({
+  width: toRem(54),
+  backgroundColor: color.Surface.Container,
+  color: color.Surface.OnContainer,
+  position: 'relative',
+});
+
+export const SidebarContent = style({
+  padding: `${config.space.S200} 0`,
+});
+
+export const SidebarStack = style({
+  width: '100%',
+  backgroundColor: color.Surface.Container,
+});
+
+export const NativeEmojiSidebarStack = style({
+  position: 'sticky',
+  bottom: '-67%',
+  zIndex: 1,
+});
+
+export const SidebarDivider = style({
+  width: toRem(18),
+});
+
+export const Header = style({
+  padding: config.space.S300,
+  paddingBottom: 0,
+});
+
+export const EmojiBoardTab = style({
+  cursor: 'pointer',
+});
+
+export const Footer = style({
+  padding: config.space.S200,
+  margin: config.space.S300,
+  marginTop: 0,
+  minHeight: toRem(40),
+
+  borderRadius: config.radii.R400,
+  backgroundColor: color.SurfaceVariant.Container,
+  color: color.SurfaceVariant.OnContainer,
+});
+
+export const EmojiGroup = style({
+  padding: `${config.space.S300} 0`,
+});
+
+export const EmojiGroupLabel = style({
+  position: 'sticky',
+  top: config.space.S200,
+  zIndex: 1,
+
+  margin: 'auto',
+  padding: `${config.space.S100} ${config.space.S200}`,
+  borderRadius: config.radii.Pill,
+  backgroundColor: color.SurfaceVariant.Container,
+  color: color.SurfaceVariant.OnContainer,
+});
+
+export const EmojiGroupContent = style([
+  DefaultReset,
+  {
+    padding: `0 ${config.space.S200}`,
+  },
+]);
+
+export const EmojiPreview = style([
+  DefaultReset,
+  {
+    width: toRem(32),
+    height: toRem(32),
+    fontSize: toRem(32),
+    lineHeight: toRem(32),
+  },
+]);
+
+export const EmojiItem = style([
+  DefaultReset,
+  FocusOutline,
+  {
+    width: toRem(48),
+    height: toRem(48),
+    fontSize: toRem(32),
+    lineHeight: toRem(32),
+    borderRadius: config.radii.R400,
+    cursor: 'pointer',
+
+    ':hover': {
+      backgroundColor: color.Surface.ContainerHover,
+    },
+  },
+]);
+
+export const StickerItem = style([
+  EmojiItem,
+  {
+    width: toRem(112),
+    height: toRem(112),
+  },
+]);
+
+export const CustomEmojiImg = style([
+  DefaultReset,
+  {
+    width: toRem(32),
+    height: toRem(32),
+    objectFit: 'contain',
+  },
+]);
+
+export const StickerImg = style([
+  DefaultReset,
+  {
+    width: toRem(96),
+    height: toRem(96),
+    objectFit: 'contain',
+  },
+]);

src/app/components/emoji-board/EmojiBoard.tsx

@@ -0,0 +1,907 @@
+import React, {
+  ChangeEventHandler,
+  FocusEventHandler,
+  MouseEventHandler,
+  UIEventHandler,
+  ReactNode,
+  memo,
+  useCallback,
+  useEffect,
+  useMemo,
+  useRef,
+} from 'react';
+import {
+  Badge,
+  Box,
+  Chip,
+  Icon,
+  IconButton,
+  Icons,
+  Input,
+  Line,
+  Scroll,
+  Text,
+  Tooltip,
+  TooltipProvider,
+  as,
+  config,
+  toRem,
+} from 'folds';
+import FocusTrap from 'focus-trap-react';
+import { isKeyHotkey } from 'is-hotkey';
+import classNames from 'classnames';
+import { MatrixClient, Room } from 'matrix-js-sdk';
+import { atom, useAtomValue, useSetAtom } from 'jotai';
+
+import * as css from './EmojiBoard.css';
+import { EmojiGroupId, IEmoji, IEmojiGroup, emojiGroups, emojis } from '../../plugins/emoji';
+import { IEmojiGroupLabels, useEmojiGroupLabels } from './useEmojiGroupLabels';
+import { IEmojiGroupIcons, useEmojiGroupIcons } from './useEmojiGroupIcons';
+import { preventScrollWithArrowKey, stopPropagation } from '../../utils/keyboard';
+import { useRelevantImagePacks } from '../../hooks/useImagePacks';
+import { useMatrixClient } from '../../hooks/useMatrixClient';
+import { useRecentEmoji } from '../../hooks/useRecentEmoji';
+import { ExtendedPackImage, ImagePack, PackUsage } from '../../plugins/custom-emoji';
+import { isUserId } from '../../utils/matrix';
+import { editableActiveElement, isIntersectingScrollView, targetFromEvent } from '../../utils/dom';
+import { useAsyncSearch, UseAsyncSearchOptions } from '../../hooks/useAsyncSearch';
+import { useDebounce } from '../../hooks/useDebounce';
+import { useThrottle } from '../../hooks/useThrottle';
+import { addRecentEmoji } from '../../plugins/recent-emoji';
+import { mobileOrTablet } from '../../utils/user-agent';
+
+const RECENT_GROUP_ID = 'recent_group';
+const SEARCH_GROUP_ID = 'search_group';
+
+export enum EmojiBoardTab {
+  Emoji = 'Emoji',
+  Sticker = 'Sticker',
+}
+
+enum EmojiType {
+  Emoji = 'emoji',
+  CustomEmoji = 'customEmoji',
+  Sticker = 'sticker',
+}
+
+export type EmojiItemInfo = {
+  type: EmojiType;
+  data: string;
+  shortcode: string;
+  label: string;
+};
+
+const getDOMGroupId = (id: string): string => `EmojiBoardGroup-${id}`;
+
+const getEmojiItemInfo = (element: Element): EmojiItemInfo | undefined => {
+  const type = element.getAttribute('data-emoji-type') as EmojiType | undefined;
+  const data = element.getAttribute('data-emoji-data');
+  const label = element.getAttribute('title');
+  const shortcode = element.getAttribute('data-emoji-shortcode');
+
+  if (type && data && shortcode && label)
+    return {
+      type,
+      data,
+      shortcode,
+      label,
+    };
+  return undefined;
+};
+
+const activeGroupIdAtom = atom<string | undefined>(undefined);
+
+function Sidebar({ children }: { children: ReactNode }) {
+  return (
+    <Box className={css.Sidebar} shrink="No">
+      <Scroll size="0">
+        <Box className={css.SidebarContent} direction="Column" alignItems="Center" gap="100">
+          {children}
+        </Box>
+      </Scroll>
+    </Box>
+  );
+}
+
+const SidebarStack = as<'div'>(({ className, children, ...props }, ref) => (
+  <Box
+    className={classNames(css.SidebarStack, className)}
+    direction="Column"
+    alignItems="Center"
+    gap="100"
+    {...props}
+    ref={ref}
+  >
+    {children}
+  </Box>
+));
+function SidebarDivider() {
+  return <Line className={css.SidebarDivider} size="300" variant="Surface" />;
+}
+
+function Header({ children }: { children: ReactNode }) {
+  return (
+    <Box className={css.Header} direction="Column" shrink="No">
+      {children}
+    </Box>
+  );
+}
+
+function Content({ children }: { children: ReactNode }) {
+  return <Box grow="Yes">{children}</Box>;
+}
+
+function Footer({ children }: { children: ReactNode }) {
+  return (
+    <Box shrink="No" className={css.Footer} gap="300" alignItems="Center">
+      {children}
+    </Box>
+  );
+}
+
+const EmojiBoardLayout = as<
+  'div',
+  {
+    header: ReactNode;
+    sidebar?: ReactNode;
+    footer?: ReactNode;
+    children: ReactNode;
+  }
+>(({ className, header, sidebar, footer, children, ...props }, ref) => (
+  <Box
+    display="InlineFlex"
+    className={classNames(css.Base, className)}
+    direction="Row"
+    {...props}
+    ref={ref}
+  >
+    <Box direction="Column" grow="Yes">
+      {header}
+      {children}
+      {footer}
+    </Box>
+    <Line size="300" direction="Vertical" />
+    {sidebar}
+  </Box>
+));
+
+function EmojiBoardTabs({
+  tab,
+  onTabChange,
+}: {
+  tab: EmojiBoardTab;
+  onTabChange: (tab: EmojiBoardTab) => void;
+}) {
+  return (
+    <Box gap="100">
+      <Badge
+        className={css.EmojiBoardTab}
+        as="button"
+        variant="Secondary"
+        fill={tab === EmojiBoardTab.Sticker ? 'Solid' : 'None'}
+        size="500"
+        onClick={() => onTabChange(EmojiBoardTab.Sticker)}
+      >
+        <Text as="span" size="L400">
+          Sticker
+        </Text>
+      </Badge>
+      <Badge
+        className={css.EmojiBoardTab}
+        as="button"
+        variant="Secondary"
+        fill={tab === EmojiBoardTab.Emoji ? 'Solid' : 'None'}
+        size="500"
+        onClick={() => onTabChange(EmojiBoardTab.Emoji)}
+      >
+        <Text as="span" size="L400">
+          Emoji
+        </Text>
+      </Badge>
+    </Box>
+  );
+}
+
+export function SidebarBtn<T extends string>({
+  active,
+  label,
+  id,
+  onItemClick,
+  children,
+}: {
+  active?: boolean;
+  label: string;
+  id: T;
+  onItemClick: (id: T) => void;
+  children: ReactNode;
+}) {
+  return (
+    <TooltipProvider
+      delay={500}
+      position="Left"
+      tooltip={
+        <Tooltip id={`SidebarStackItem-${id}-label`}>
+          <Text size="T300">{label}</Text>
+        </Tooltip>
+      }
+    >
+      {(ref) => (
+        <IconButton
+          aria-pressed={active}
+          aria-labelledby={`SidebarStackItem-${id}-label`}
+          ref={ref}
+          onClick={() => onItemClick(id)}
+          size="400"
+          radii="300"
+          variant="Surface"
+        >
+          {children}
+        </IconButton>
+      )}
+    </TooltipProvider>
+  );
+}
+
+export const EmojiGroup = as<
+  'div',
+  {
+    id: string;
+    label: string;
+    children: ReactNode;
+  }
+>(({ className, id, label, children, ...props }, ref) => (
+  <Box
+    id={getDOMGroupId(id)}
+    data-group-id={id}
+    className={classNames(css.EmojiGroup, className)}
+    direction="Column"
+    gap="200"
+    {...props}
+    ref={ref}
+  >
+    <Text id={`EmojiGroup-${id}-label`} as="label" className={css.EmojiGroupLabel} size="O400">
+      {label}
+    </Text>
+    <div aria-labelledby={`EmojiGroup-${id}-label`} className={css.EmojiGroupContent}>
+      <Box wrap="Wrap" justifyContent="Center">
+        {children}
+      </Box>
+    </div>
+  </Box>
+));
+
+export function EmojiItem({
+  label,
+  type,
+  data,
+  shortcode,
+  children,
+}: {
+  label: string;
+  type: EmojiType;
+  data: string;
+  shortcode: string;
+  children: ReactNode;
+}) {
+  return (
+    <Box
+      as="button"
+      className={css.EmojiItem}
+      type="button"
+      alignItems="Center"
+      justifyContent="Center"
+      title={label}
+      aria-label={`${label} emoji`}
+      data-emoji-type={type}
+      data-emoji-data={data}
+      data-emoji-shortcode={shortcode}
+    >
+      {children}
+    </Box>
+  );
+}
+
+export function StickerItem({
+  label,
+  type,
+  data,
+  shortcode,
+  children,
+}: {
+  label: string;
+  type: EmojiType;
+  data: string;
+  shortcode: string;
+  children: ReactNode;
+}) {
+  return (
+    <Box
+      as="button"
+      className={css.StickerItem}
+      type="button"
+      alignItems="Center"
+      justifyContent="Center"
+      title={label}
+      aria-label={`${label} sticker`}
+      data-emoji-type={type}
+      data-emoji-data={data}
+      data-emoji-shortcode={shortcode}
+    >
+      {children}
+    </Box>
+  );
+}
+
+function RecentEmojiSidebarStack({ onItemClick }: { onItemClick: (id: string) => void }) {
+  const activeGroupId = useAtomValue(activeGroupIdAtom);
+
+  return (
+    <SidebarStack>
+      <SidebarBtn
+        active={activeGroupId === RECENT_GROUP_ID}
+        id={RECENT_GROUP_ID}
+        label="Recent"
+        onItemClick={() => onItemClick(RECENT_GROUP_ID)}
+      >
+        <Icon src={Icons.RecentClock} filled={activeGroupId === RECENT_GROUP_ID} />
+      </SidebarBtn>
+    </SidebarStack>
+  );
+}
+
+function ImagePackSidebarStack({
+  mx,
+  packs,
+  usage,
+  onItemClick,
+}: {
+  mx: MatrixClient;
+  packs: ImagePack[];
+  usage: PackUsage;
+  onItemClick: (id: string) => void;
+}) {
+  const activeGroupId = useAtomValue(activeGroupIdAtom);
+  return (
+    <SidebarStack>
+      {usage === PackUsage.Emoticon && <SidebarDivider />}
+      {packs.map((pack) => {
+        let label = pack.displayName;
+        if (!label) label = isUserId(pack.id) ? 'Personal Pack' : mx.getRoom(pack.id)?.name;
+        return (
+          <SidebarBtn
+            active={activeGroupId === pack.id}
+            key={pack.id}
+            id={pack.id}
+            label={label || 'Unknown Pack'}
+            onItemClick={onItemClick}
+          >
+            <img
+              style={{
+                width: toRem(24),
+                height: toRem(24),
+                objectFit: 'contain',
+              }}
+              src={mx.mxcUrlToHttp(pack.getPackAvatarUrl(usage) ?? '') || pack.avatarUrl}
+              alt={label || 'Unknown Pack'}
+            />
+          </SidebarBtn>
+        );
+      })}
+    </SidebarStack>
+  );
+}
+
+function NativeEmojiSidebarStack({
+  groups,
+  icons,
+  labels,
+  onItemClick,
+}: {
+  groups: IEmojiGroup[];
+  icons: IEmojiGroupIcons;
+  labels: IEmojiGroupLabels;
+  onItemClick: (id: EmojiGroupId) => void;
+}) {
+  const activeGroupId = useAtomValue(activeGroupIdAtom);
+  return (
+    <SidebarStack className={css.NativeEmojiSidebarStack}>
+      <SidebarDivider />
+      {groups.map((group) => (
+        <SidebarBtn
+          key={group.id}
+          active={activeGroupId === group.id}
+          id={group.id}
+          label={labels[group.id]}
+          onItemClick={onItemClick}
+        >
+          <Icon src={icons[group.id]} filled={activeGroupId === group.id} />
+        </SidebarBtn>
+      ))}
+    </SidebarStack>
+  );
+}
+
+export function RecentEmojiGroup({
+  label,
+  id,
+  emojis: recentEmojis,
+}: {
+  label: string;
+  id: string;
+  emojis: IEmoji[];
+}) {
+  return (
+    <EmojiGroup key={id} id={id} label={label}>
+      {recentEmojis.map((emoji) => (
+        <EmojiItem
+          key={emoji.unicode}
+          label={emoji.label}
+          type={EmojiType.Emoji}
+          data={emoji.unicode}
+          shortcode={emoji.shortcode}
+        >
+          {emoji.unicode}
+        </EmojiItem>
+      ))}
+    </EmojiGroup>
+  );
+}
+
+export function SearchEmojiGroup({
+  mx,
+  tab,
+  label,
+  id,
+  emojis: searchResult,
+}: {
+  mx: MatrixClient;
+  tab: EmojiBoardTab;
+  label: string;
+  id: string;
+  emojis: Array<ExtendedPackImage | IEmoji>;
+}) {
+  return (
+    <EmojiGroup key={id} id={id} label={label}>
+      {tab === EmojiBoardTab.Emoji
+        ? searchResult.map((emoji) =>
+            'unicode' in emoji ? (
+              <EmojiItem
+                key={emoji.unicode}
+                label={emoji.label}
+                type={EmojiType.Emoji}
+                data={emoji.unicode}
+                shortcode={emoji.shortcode}
+              >
+                {emoji.unicode}
+              </EmojiItem>
+            ) : (
+              <EmojiItem
+                key={emoji.shortcode}
+                label={emoji.body || emoji.shortcode}
+                type={EmojiType.CustomEmoji}
+                data={emoji.url}
+                shortcode={emoji.shortcode}
+              >
+                <img
+                  loading="lazy"
+                  className={css.CustomEmojiImg}
+                  alt={emoji.body || emoji.shortcode}
+                  src={mx.mxcUrlToHttp(emoji.url) ?? emoji.url}
+                />
+              </EmojiItem>
+            )
+          )
+        : searchResult.map((emoji) =>
+            'unicode' in emoji ? null : (
+              <StickerItem
+                key={emoji.shortcode}
+                label={emoji.body || emoji.shortcode}
+                type={EmojiType.Sticker}
+                data={emoji.url}
+                shortcode={emoji.shortcode}
+              >
+                <img
+                  loading="lazy"
+                  className={css.StickerImg}
+                  alt={emoji.body || emoji.shortcode}
+                  src={mx.mxcUrlToHttp(emoji.url) ?? emoji.url}
+                />
+              </StickerItem>
+            )
+          )}
+    </EmojiGroup>
+  );
+}
+
+export const CustomEmojiGroups = memo(
+  ({ mx, groups }: { mx: MatrixClient; groups: ImagePack[] }) => (
+    <>
+      {groups.map((pack) => (
+        <EmojiGroup key={pack.id} id={pack.id} label={pack.displayName || 'Unknown'}>
+          {pack.getEmojis().map((image) => (
+            <EmojiItem
+              key={image.shortcode}
+              label={image.body || image.shortcode}
+              type={EmojiType.CustomEmoji}
+              data={image.url}
+              shortcode={image.shortcode}
+            >
+              <img
+                loading="lazy"
+                className={css.CustomEmojiImg}
+                alt={image.body || image.shortcode}
+                src={mx.mxcUrlToHttp(image.url) ?? image.url}
+              />
+            </EmojiItem>
+          ))}
+        </EmojiGroup>
+      ))}
+    </>
+  )
+);
+
+export const StickerGroups = memo(({ mx, groups }: { mx: MatrixClient; groups: ImagePack[] }) => (
+  <>
+    {groups.length === 0 && (
+      <Box
+        style={{ padding: `${toRem(60)} ${config.space.S500}` }}
+        alignItems="Center"
+        justifyContent="Center"
+        direction="Column"
+        gap="300"
+      >
+        <Icon size="600" src={Icons.Sticker} />
+        <Box direction="Inherit">
+          <Text align="Center">No Sticker Packs!</Text>
+          <Text priority="300" align="Center" size="T200">
+            Add stickers from user, room or space settings.
+          </Text>
+        </Box>
+      </Box>
+    )}
+    {groups.map((pack) => (
+      <EmojiGroup key={pack.id} id={pack.id} label={pack.displayName || 'Unknown'}>
+        {pack.getStickers().map((image) => (
+          <StickerItem
+            key={image.shortcode}
+            label={image.body || image.shortcode}
+            type={EmojiType.Sticker}
+            data={image.url}
+            shortcode={image.shortcode}
+          >
+            <img
+              loading="lazy"
+              className={css.StickerImg}
+              alt={image.body || image.shortcode}
+              src={mx.mxcUrlToHttp(image.url) ?? image.url}
+            />
+          </StickerItem>
+        ))}
+      </EmojiGroup>
+    ))}
+  </>
+));
+
+export const NativeEmojiGroups = memo(
+  ({ groups, labels }: { groups: IEmojiGroup[]; labels: IEmojiGroupLabels }) => (
+    <>
+      {groups.map((emojiGroup) => (
+        <EmojiGroup key={emojiGroup.id} id={emojiGroup.id} label={labels[emojiGroup.id]}>
+          {emojiGroup.emojis.map((emoji) => (
+            <EmojiItem
+              key={emoji.unicode}
+              label={emoji.label}
+              type={EmojiType.Emoji}
+              data={emoji.unicode}
+              shortcode={emoji.shortcode}
+            >
+              {emoji.unicode}
+            </EmojiItem>
+          ))}
+        </EmojiGroup>
+      ))}
+    </>
+  )
+);
+
+const getSearchListItemStr = (item: ExtendedPackImage | IEmoji) => {
+  const shortcode = `:${item.shortcode}:`;
+  if ('body' in item) {
+    return [shortcode, item.body ?? ''];
+  }
+  return shortcode;
+};
+const SEARCH_OPTIONS: UseAsyncSearchOptions = {
+  limit: 26,
+  matchOptions: {
+    contain: true,
+  },
+};
+
+export function EmojiBoard({
+  tab = EmojiBoardTab.Emoji,
+  onTabChange,
+  imagePackRooms,
+  requestClose,
+  returnFocusOnDeactivate,
+  onEmojiSelect,
+  onCustomEmojiSelect,
+  onStickerSelect,
+  allowTextCustomEmoji,
+}: {
+  tab?: EmojiBoardTab;
+  onTabChange?: (tab: EmojiBoardTab) => void;
+  imagePackRooms: Room[];
+  requestClose: () => void;
+  returnFocusOnDeactivate?: boolean;
+  onEmojiSelect?: (unicode: string, shortcode: string) => void;
+  onCustomEmojiSelect?: (mxc: string, shortcode: string) => void;
+  onStickerSelect?: (mxc: string, shortcode: string, label: string) => void;
+  allowTextCustomEmoji?: boolean;
+}) {
+  const emojiTab = tab === EmojiBoardTab.Emoji;
+  const stickerTab = tab === EmojiBoardTab.Sticker;
+  const usage = emojiTab ? PackUsage.Emoticon : PackUsage.Sticker;
+
+  const setActiveGroupId = useSetAtom(activeGroupIdAtom);
+  const mx = useMatrixClient();
+  const emojiGroupLabels = useEmojiGroupLabels();
+  const emojiGroupIcons = useEmojiGroupIcons();
+  const imagePacks = useRelevantImagePacks(mx, usage, imagePackRooms);
+  const recentEmojis = useRecentEmoji(mx, 21);
+
+  const contentScrollRef = useRef<HTMLDivElement>(null);
+  const emojiPreviewRef = useRef<HTMLDivElement>(null);
+  const emojiPreviewTextRef = useRef<HTMLParagraphElement>(null);
+
+  const searchList = useMemo(() => {
+    let list: Array<ExtendedPackImage | IEmoji> = [];
+    list = list.concat(imagePacks.flatMap((pack) => pack.getImagesFor(usage)));
+    if (emojiTab) list = list.concat(emojis);
+    return list;
+  }, [emojiTab, usage, imagePacks]);
+
+  const [result, search, resetSearch] = useAsyncSearch(
+    searchList,
+    getSearchListItemStr,
+    SEARCH_OPTIONS
+  );
+
+  const handleOnChange: ChangeEventHandler<HTMLInputElement> = useDebounce(
+    useCallback(
+      (evt) => {
+        const term = evt.target.value;
+        if (term) search(term);
+        else resetSearch();
+      },
+      [search, resetSearch]
+    ),
+    { wait: 200 }
+  );
+
+  const syncActiveGroupId = useCallback(() => {
+    const targetEl = contentScrollRef.current;
+    if (!targetEl) return;
+    const groupEls = [...targetEl.querySelectorAll('div[data-group-id]')] as HTMLElement[];
+    const groupEl = groupEls.find((el) => isIntersectingScrollView(targetEl, el));
+    const groupId = groupEl?.getAttribute('data-group-id') ?? undefined;
+    setActiveGroupId(groupId);
+  }, [setActiveGroupId]);
+
+  const handleOnScroll: UIEventHandler<HTMLDivElement> = useThrottle(syncActiveGroupId, {
+    wait: 500,
+  });
+
+  const handleScrollToGroup = (groupId: string) => {
+    setActiveGroupId(groupId);
+    const groupElement = document.getElementById(getDOMGroupId(groupId));
+    groupElement?.scrollIntoView();
+  };
+
+  const handleEmojiClick: MouseEventHandler = (evt) => {
+    const targetEl = targetFromEvent(evt.nativeEvent, 'button');
+    if (!targetEl) return;
+    const emojiInfo = getEmojiItemInfo(targetEl);
+    if (!emojiInfo) return;
+    if (emojiInfo.type === EmojiType.Emoji) {
+      onEmojiSelect?.(emojiInfo.data, emojiInfo.shortcode);
+      if (!evt.altKey && !evt.shiftKey) {
+        addRecentEmoji(mx, emojiInfo.data);
+        requestClose();
+      }
+    }
+    if (emojiInfo.type === EmojiType.CustomEmoji) {
+      onCustomEmojiSelect?.(emojiInfo.data, emojiInfo.shortcode);
+      if (!evt.altKey && !evt.shiftKey) requestClose();
+    }
+    if (emojiInfo.type === EmojiType.Sticker) {
+      onStickerSelect?.(emojiInfo.data, emojiInfo.shortcode, emojiInfo.label);
+      if (!evt.altKey && !evt.shiftKey) requestClose();
+    }
+  };
+
+  const handleEmojiPreview = useCallback(
+    (element: HTMLButtonElement) => {
+      const emojiInfo = getEmojiItemInfo(element);
+      if (!emojiInfo || !emojiPreviewTextRef.current) return;
+      if (emojiInfo.type === EmojiType.Emoji && emojiPreviewRef.current) {
+        emojiPreviewRef.current.textContent = emojiInfo.data;
+      } else if (emojiInfo.type === EmojiType.CustomEmoji && emojiPreviewRef.current) {
+        const img = document.createElement('img');
+        img.className = css.CustomEmojiImg;
+        img.setAttribute('src', mx.mxcUrlToHttp(emojiInfo.data) || emojiInfo.data);
+        img.setAttribute('alt', emojiInfo.shortcode);
+        emojiPreviewRef.current.textContent = '';
+        emojiPreviewRef.current.appendChild(img);
+      }
+      emojiPreviewTextRef.current.textContent = `:${emojiInfo.shortcode}:`;
+    },
+    [mx]
+  );
+
+  const throttleEmojiHover = useThrottle(handleEmojiPreview, {
+    wait: 200,
+    immediate: true,
+  });
+
+  const handleEmojiHover: MouseEventHandler = (evt) => {
+    const targetEl = targetFromEvent(evt.nativeEvent, 'button') as HTMLButtonElement | undefined;
+    if (!targetEl) return;
+    throttleEmojiHover(targetEl);
+  };
+
+  const handleEmojiFocus: FocusEventHandler = (evt) => {
+    const targetEl = evt.target as HTMLButtonElement;
+    handleEmojiPreview(targetEl);
+  };
+
+  // Reset scroll top on search and tab change
+  useEffect(() => {
+    syncActiveGroupId();
+    contentScrollRef.current?.scrollTo({
+      top: 0,
+    });
+  }, [result, emojiTab, syncActiveGroupId]);
+
+  return (
+    <FocusTrap
+      focusTrapOptions={{
+        returnFocusOnDeactivate,
+        initialFocus: false,
+        onDeactivate: requestClose,
+        clickOutsideDeactivates: true,
+        allowOutsideClick: true,
+        isKeyForward: (evt: KeyboardEvent) =>
+          !editableActiveElement() && isKeyHotkey(['arrowdown', 'arrowright'], evt),
+        isKeyBackward: (evt: KeyboardEvent) =>
+          !editableActiveElement() && isKeyHotkey(['arrowup', 'arrowleft'], evt),
+        escapeDeactivates: stopPropagation,
+      }}
+    >
+      <EmojiBoardLayout
+        header={
+          <Header>
+            <Box direction="Column" gap="200">
+              {onTabChange && <EmojiBoardTabs tab={tab} onTabChange={onTabChange} />}
+              <Input
+                data-emoji-board-search
+                variant="SurfaceVariant"
+                size="400"
+                placeholder={allowTextCustomEmoji ? 'Search or Text Reaction ' : 'Search'}
+                maxLength={50}
+                after={
+                  allowTextCustomEmoji && result?.query ? (
+                    <Chip
+                      variant="Primary"
+                      radii="Pill"
+                      after={<Icon src={Icons.ArrowRight} size="50" />}
+                      outlined
+                      onClick={() => {
+                        const searchInput = document.querySelector<HTMLInputElement>(
+                          '[data-emoji-board-search="true"]'
+                        );
+                        const textReaction = searchInput?.value.trim();
+                        if (!textReaction) return;
+                        onCustomEmojiSelect?.(textReaction, textReaction);
+                        requestClose();
+                      }}
+                    >
+                      <Text size="L400">React</Text>
+                    </Chip>
+                  ) : (
+                    <Icon src={Icons.Search} size="50" />
+                  )
+                }
+                onChange={handleOnChange}
+                autoFocus={!mobileOrTablet()}
+              />
+            </Box>
+          </Header>
+        }
+        sidebar={
+          <Sidebar>
+            {emojiTab && recentEmojis.length > 0 && (
+              <RecentEmojiSidebarStack onItemClick={handleScrollToGroup} />
+            )}
+            {imagePacks.length > 0 && (
+              <ImagePackSidebarStack
+                mx={mx}
+                usage={usage}
+                packs={imagePacks}
+                onItemClick={handleScrollToGroup}
+              />
+            )}
+            {emojiTab && (
+              <NativeEmojiSidebarStack
+                groups={emojiGroups}
+                icons={emojiGroupIcons}
+                labels={emojiGroupLabels}
+                onItemClick={handleScrollToGroup}
+              />
+            )}
+          </Sidebar>
+        }
+        footer={
+          emojiTab ? (
+            <Footer>
+              <Box
+                display="InlineFlex"
+                ref={emojiPreviewRef}
+                className={css.EmojiPreview}
+                alignItems="Center"
+                justifyContent="Center"
+              >
+                😃
+              </Box>
+              <Text ref={emojiPreviewTextRef} size="H5" truncate>
+                :smiley:
+              </Text>
+            </Footer>
+          ) : (
+            imagePacks.length > 0 && (
+              <Footer>
+                <Text ref={emojiPreviewTextRef} size="H5" truncate>
+                  :smiley:
+                </Text>
+              </Footer>
+            )
+          )
+        }
+      >
+        <Content>
+          <Scroll
+            ref={contentScrollRef}
+            size="400"
+            onScroll={handleOnScroll}
+            onKeyDown={preventScrollWithArrowKey}
+            hideTrack
+          >
+            <Box
+              onClick={handleEmojiClick}
+              onMouseMove={handleEmojiHover}
+              onFocus={handleEmojiFocus}
+              direction="Column"
+              gap="200"
+            >
+              {result && (
+                <SearchEmojiGroup
+                  mx={mx}
+                  tab={tab}
+                  id={SEARCH_GROUP_ID}
+                  label={result.items.length ? 'Search Results' : 'No Results found'}
+                  emojis={result.items}
+                />
+              )}
+              {emojiTab && recentEmojis.length > 0 && (
+                <RecentEmojiGroup id={RECENT_GROUP_ID} label="Recent" emojis={recentEmojis} />
+              )}
+              {emojiTab && <CustomEmojiGroups mx={mx} groups={imagePacks} />}
+              {stickerTab && <StickerGroups mx={mx} groups={imagePacks} />}
+              {emojiTab && <NativeEmojiGroups groups={emojiGroups} labels={emojiGroupLabels} />}
+            </Box>
+          </Scroll>
+        </Content>
+      </EmojiBoardLayout>
+    </FocusTrap>
+  );
+}

src/app/components/emoji-board/index.ts

@@ -0,0 +1 @@
+export * from './EmojiBoard';

src/app/components/emoji-board/useEmojiGroupIcons.ts

@@ -0,0 +1,21 @@
+import { useMemo } from 'react';
+import { IconSrc, Icons } from 'folds';
+
+import { EmojiGroupId } from '../../plugins/emoji';
+
+export type IEmojiGroupIcons = Record<EmojiGroupId, IconSrc>;
+
+export const useEmojiGroupIcons = (): IEmojiGroupIcons =>
+  useMemo(
+    () => ({
+      [EmojiGroupId.People]: Icons.Smile,
+      [EmojiGroupId.Nature]: Icons.Leaf,
+      [EmojiGroupId.Food]: Icons.Cup,
+      [EmojiGroupId.Activity]: Icons.Ball,
+      [EmojiGroupId.Travel]: Icons.Photo,
+      [EmojiGroupId.Object]: Icons.Bulb,
+      [EmojiGroupId.Symbol]: Icons.Peace,
+      [EmojiGroupId.Flag]: Icons.Flag,
+    }),
+    []
+  );

src/app/components/emoji-board/useEmojiGroupLabels.ts

@@ -0,0 +1,19 @@
+import { useMemo } from 'react';
+import { EmojiGroupId } from '../../plugins/emoji';
+
+export type IEmojiGroupLabels = Record<EmojiGroupId, string>;
+
+export const useEmojiGroupLabels = (): IEmojiGroupLabels =>
+  useMemo(
+    () => ({
+      [EmojiGroupId.People]: 'Smileys & People',
+      [EmojiGroupId.Nature]: 'Animals & Nature',
+      [EmojiGroupId.Food]: 'Food & Drinks',
+      [EmojiGroupId.Activity]: 'Activity',
+      [EmojiGroupId.Travel]: 'Travel & Places',
+      [EmojiGroupId.Object]: 'Objects',
+      [EmojiGroupId.Symbol]: 'Symbols',
+      [EmojiGroupId.Flag]: 'Flags',
+    }),
+    []
+  );

src/app/components/event-readers/EventReaders.css.ts

@@ -0,0 +1,21 @@
+import { style } from '@vanilla-extract/css';
+import { DefaultReset, config } from 'folds';
+
+export const EventReaders = style([
+  DefaultReset,
+  {
+    height: '100%',
+  },
+]);
+
+export const Header = style({
+  paddingLeft: config.space.S400,
+  paddingRight: config.space.S300,
+
+  flexShrink: 0,
+});
+
+export const Content = style({
+  paddingLeft: config.space.S200,
+  paddingBottom: config.space.S400,
+});

src/app/components/event-readers/EventReaders.tsx

@@ -0,0 +1,94 @@
+import React from 'react';
+import classNames from 'classnames';
+import {
+  Avatar,
+  Box,
+  Header,
+  Icon,
+  IconButton,
+  Icons,
+  MenuItem,
+  Scroll,
+  Text,
+  as,
+  config,
+} from 'folds';
+import { Room } from 'matrix-js-sdk';
+import { useRoomEventReaders } from '../../hooks/useRoomEventReaders';
+import { getMemberDisplayName } from '../../utils/room';
+import { getMxIdLocalPart } from '../../utils/matrix';
+import * as css from './EventReaders.css';
+import { useMatrixClient } from '../../hooks/useMatrixClient';
+import { openProfileViewer } from '../../../client/action/navigation';
+import { UserAvatar } from '../user-avatar';
+
+export type EventReadersProps = {
+  room: Room;
+  eventId: string;
+  requestClose: () => void;
+};
+export const EventReaders = as<'div', EventReadersProps>(
+  ({ className, room, eventId, requestClose, ...props }, ref) => {
+    const mx = useMatrixClient();
+    const latestEventReaders = useRoomEventReaders(room, eventId);
+
+    const getName = (userId: string) =>
+      getMemberDisplayName(room, userId) ?? getMxIdLocalPart(userId) ?? userId;
+
+    return (
+      <Box
+        className={classNames(css.EventReaders, className)}
+        direction="Column"
+        {...props}
+        ref={ref}
+      >
+        <Header className={css.Header} variant="Surface" size="600">
+          <Box grow="Yes">
+            <Text size="H3">Seen by</Text>
+          </Box>
+          <IconButton size="300" onClick={requestClose}>
+            <Icon src={Icons.Cross} />
+          </IconButton>
+        </Header>
+        <Box grow="Yes">
+          <Scroll visibility="Hover" hideTrack size="300">
+            <Box className={css.Content} direction="Column">
+              {latestEventReaders.map((readerId) => {
+                const name = getName(readerId);
+                const avatarUrl = room
+                  .getMember(readerId)
+                  ?.getAvatarUrl(mx.baseUrl, 100, 100, 'crop', undefined, false);
+
+                return (
+                  <MenuItem
+                    key={readerId}
+                    style={{ padding: `0 ${config.space.S200}` }}
+                    radii="400"
+                    onClick={() => {
+                      requestClose();
+                      openProfileViewer(readerId, room.roomId);
+                    }}
+                    before={
+                      <Avatar size="200">
+                        <UserAvatar
+                          userId={readerId}
+                          src={avatarUrl ?? undefined}
+                          alt={name}
+                          renderFallback={() => <Icon size="50" src={Icons.User} filled />}
+                        />
+                      </Avatar>
+                    }
+                  >
+                    <Text size="T400" truncate>
+                      {name}
+                    </Text>
+                  </MenuItem>
+                );
+              })}
+            </Box>
+          </Scroll>
+        </Box>
+      </Box>
+    );
+  }
+);

src/app/components/event-readers/index.ts

@@ -0,0 +1 @@
+export * from './EventReaders';

src/app/components/image-viewer/ImageViewer.css.ts

@@ -0,0 +1,42 @@
+import { style } from '@vanilla-extract/css';
+import { DefaultReset, color, config } from 'folds';
+
+export const ImageViewer = style([
+  DefaultReset,
+  {
+    height: '100%',
+  },
+]);
+
+export const ImageViewerHeader = style([
+  DefaultReset,
+  {
+    paddingLeft: config.space.S200,
+    paddingRight: config.space.S200,
+    borderBottomWidth: config.borderWidth.B300,
+    flexShrink: 0,
+    gap: config.space.S200,
+  },
+]);
+
+export const ImageViewerContent = style([
+  DefaultReset,
+  {
+    backgroundColor: color.Background.Container,
+    color: color.Background.OnContainer,
+    overflow: 'hidden',
+  },
+]);
+
+export const ImageViewerImg = style([
+  DefaultReset,
+  {
+    objectFit: 'contain',
+    width: 'auto',
+    height: 'auto',
+    maxWidth: '100%',
+    maxHeight: '100%',
+    backgroundColor: color.Surface.Container,
+    transition: 'transform 100ms linear',
+  },
+]);

src/app/components/image-viewer/ImageViewer.tsx

@@ -0,0 +1,95 @@
+/* eslint-disable jsx-a11y/no-noninteractive-element-interactions */
+import React from 'react';
+import FileSaver from 'file-saver';
+import classNames from 'classnames';
+import { Box, Chip, Header, Icon, IconButton, Icons, Text, as } from 'folds';
+import * as css from './ImageViewer.css';
+import { useZoom } from '../../hooks/useZoom';
+import { usePan } from '../../hooks/usePan';
+
+export type ImageViewerProps = {
+  alt: string;
+  src: string;
+  requestClose: () => void;
+};
+
+export const ImageViewer = as<'div', ImageViewerProps>(
+  ({ className, alt, src, requestClose, ...props }, ref) => {
+    const { zoom, zoomIn, zoomOut, setZoom } = useZoom(0.2);
+    const { pan, cursor, onMouseDown } = usePan(zoom !== 1);
+
+    const handleDownload = () => {
+      FileSaver.saveAs(src, alt);
+    };
+
+    return (
+      <Box
+        className={classNames(css.ImageViewer, className)}
+        direction="Column"
+        {...props}
+        ref={ref}
+      >
+        <Header className={css.ImageViewerHeader} size="400">
+          <Box grow="Yes" alignItems="Center" gap="200">
+            <IconButton size="300" radii="300" onClick={requestClose}>
+              <Icon size="50" src={Icons.ArrowLeft} />
+            </IconButton>
+            <Text size="T300" truncate>
+              {alt}
+            </Text>
+          </Box>
+          <Box shrink="No" alignItems="Center" gap="200">
+            <IconButton
+              variant={zoom < 1 ? 'Success' : 'SurfaceVariant'}
+              outlined={zoom < 1}
+              size="300"
+              radii="Pill"
+              onClick={zoomOut}
+              aria-label="Zoom Out"
+            >
+              <Icon size="50" src={Icons.Minus} />
+            </IconButton>
+            <Chip variant="SurfaceVariant" radii="Pill" onClick={() => setZoom(zoom === 1 ? 2 : 1)}>
+              <Text size="B300">{Math.round(zoom * 100)}%</Text>
+            </Chip>
+            <IconButton
+              variant={zoom > 1 ? 'Success' : 'SurfaceVariant'}
+              outlined={zoom > 1}
+              size="300"
+              radii="Pill"
+              onClick={zoomIn}
+              aria-label="Zoom In"
+            >
+              <Icon size="50" src={Icons.Plus} />
+            </IconButton>
+            <Chip
+              variant="Primary"
+              onClick={handleDownload}
+              radii="300"
+              before={<Icon size="50" src={Icons.Download} />}
+            >
+              <Text size="B300">Download</Text>
+            </Chip>
+          </Box>
+        </Header>
+        <Box
+          grow="Yes"
+          className={css.ImageViewerContent}
+          justifyContent="Center"
+          alignItems="Center"
+        >
+          <img
+            className={css.ImageViewerImg}
+            style={{
+              cursor,
+              transform: `scale(${zoom}) translate(${pan.translateX}px, ${pan.translateY}px)`,
+            }}
+            src={src}
+            alt={alt}
+            onMouseDown={onMouseDown}
+          />
+        </Box>
+      </Box>
+    );
+  }
+);

src/app/components/image-viewer/index.ts

@@ -0,0 +1 @@
+export * from './ImageViewer';

src/app/components/leave-room-prompt/LeaveRoomPrompt.tsx

@@ -0,0 +1,108 @@
+import React, { useCallback, useEffect } from 'react';
+import FocusTrap from 'focus-trap-react';
+import {
+  Dialog,
+  Overlay,
+  OverlayCenter,
+  OverlayBackdrop,
+  Header,
+  config,
+  Box,
+  Text,
+  IconButton,
+  Icon,
+  Icons,
+  color,
+  Button,
+  Spinner,
+} from 'folds';
+import { MatrixError } from 'matrix-js-sdk';
+import { useMatrixClient } from '../../hooks/useMatrixClient';
+import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
+import { stopPropagation } from '../../utils/keyboard';
+
+type LeaveRoomPromptProps = {
+  roomId: string;
+  onDone: () => void;
+  onCancel: () => void;
+};
+export function LeaveRoomPrompt({ roomId, onDone, onCancel }: LeaveRoomPromptProps) {
+  const mx = useMatrixClient();
+
+  const [leaveState, leaveRoom] = useAsyncCallback<undefined, MatrixError, []>(
+    useCallback(async () => {
+      mx.leave(roomId);
+    }, [mx, roomId])
+  );
+
+  const handleLeave = () => {
+    leaveRoom();
+  };
+
+  useEffect(() => {
+    if (leaveState.status === AsyncStatus.Success) {
+      onDone();
+    }
+  }, [leaveState, onDone]);
+
+  return (
+    <Overlay open backdrop={<OverlayBackdrop />}>
+      <OverlayCenter>
+        <FocusTrap
+          focusTrapOptions={{
+            initialFocus: false,
+            onDeactivate: onCancel,
+            clickOutsideDeactivates: true,
+            escapeDeactivates: stopPropagation,
+          }}
+        >
+          <Dialog variant="Surface">
+            <Header
+              style={{
+                padding: `0 ${config.space.S200} 0 ${config.space.S400}`,
+                borderBottomWidth: config.borderWidth.B300,
+              }}
+              variant="Surface"
+              size="500"
+            >
+              <Box grow="Yes">
+                <Text size="H4">Leave Room</Text>
+              </Box>
+              <IconButton size="300" onClick={onCancel} radii="300">
+                <Icon src={Icons.Cross} />
+              </IconButton>
+            </Header>
+            <Box style={{ padding: config.space.S400 }} direction="Column" gap="400">
+              <Box direction="Column" gap="200">
+                <Text priority="400">Are you sure you want to leave this room?</Text>
+                {leaveState.status === AsyncStatus.Error && (
+                  <Text style={{ color: color.Critical.Main }} size="T300">
+                    Failed to leave room! {leaveState.error.message}
+                  </Text>
+                )}
+              </Box>
+              <Button
+                type="submit"
+                variant="Critical"
+                onClick={handleLeave}
+                before={
+                  leaveState.status === AsyncStatus.Loading ? (
+                    <Spinner fill="Solid" variant="Critical" size="200" />
+                  ) : undefined
+                }
+                aria-disabled={
+                  leaveState.status === AsyncStatus.Loading ||
+                  leaveState.status === AsyncStatus.Success
+                }
+              >
+                <Text size="B400">
+                  {leaveState.status === AsyncStatus.Loading ? 'Leaving...' : 'Leave'}
+                </Text>
+              </Button>
+            </Box>
+          </Dialog>
+        </FocusTrap>
+      </OverlayCenter>
+    </Overlay>
+  );
+}

src/app/components/leave-room-prompt/index.ts

@@ -0,0 +1 @@
+export * from './LeaveRoomPrompt';

src/app/components/leave-space-prompt/LeaveSpacePrompt.tsx

@@ -0,0 +1,108 @@
+import React, { useCallback, useEffect } from 'react';
+import FocusTrap from 'focus-trap-react';
+import {
+  Dialog,
+  Overlay,
+  OverlayCenter,
+  OverlayBackdrop,
+  Header,
+  config,
+  Box,
+  Text,
+  IconButton,
+  Icon,
+  Icons,
+  color,
+  Button,
+  Spinner,
+} from 'folds';
+import { MatrixError } from 'matrix-js-sdk';
+import { useMatrixClient } from '../../hooks/useMatrixClient';
+import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
+import { stopPropagation } from '../../utils/keyboard';
+
+type LeaveSpacePromptProps = {
+  roomId: string;
+  onDone: () => void;
+  onCancel: () => void;
+};
+export function LeaveSpacePrompt({ roomId, onDone, onCancel }: LeaveSpacePromptProps) {
+  const mx = useMatrixClient();
+
+  const [leaveState, leaveRoom] = useAsyncCallback<undefined, MatrixError, []>(
+    useCallback(async () => {
+      mx.leave(roomId);
+    }, [mx, roomId])
+  );
+
+  const handleLeave = () => {
+    leaveRoom();
+  };
+
+  useEffect(() => {
+    if (leaveState.status === AsyncStatus.Success) {
+      onDone();
+    }
+  }, [leaveState, onDone]);
+
+  return (
+    <Overlay open backdrop={<OverlayBackdrop />}>
+      <OverlayCenter>
+        <FocusTrap
+          focusTrapOptions={{
+            initialFocus: false,
+            onDeactivate: onCancel,
+            clickOutsideDeactivates: true,
+            escapeDeactivates: stopPropagation,
+          }}
+        >
+          <Dialog variant="Surface">
+            <Header
+              style={{
+                padding: `0 ${config.space.S200} 0 ${config.space.S400}`,
+                borderBottomWidth: config.borderWidth.B300,
+              }}
+              variant="Surface"
+              size="500"
+            >
+              <Box grow="Yes">
+                <Text size="H4">Leave Space</Text>
+              </Box>
+              <IconButton size="300" onClick={onCancel} radii="300">
+                <Icon src={Icons.Cross} />
+              </IconButton>
+            </Header>
+            <Box style={{ padding: config.space.S400 }} direction="Column" gap="400">
+              <Box direction="Column" gap="200">
+                <Text priority="400">Are you sure you want to leave this space?</Text>
+                {leaveState.status === AsyncStatus.Error && (
+                  <Text style={{ color: color.Critical.Main }} size="T300">
+                    Failed to leave space! {leaveState.error.message}
+                  </Text>
+                )}
+              </Box>
+              <Button
+                type="submit"
+                variant="Critical"
+                onClick={handleLeave}
+                before={
+                  leaveState.status === AsyncStatus.Loading ? (
+                    <Spinner fill="Solid" variant="Critical" size="200" />
+                  ) : undefined
+                }
+                aria-disabled={
+                  leaveState.status === AsyncStatus.Loading ||
+                  leaveState.status === AsyncStatus.Success
+                }
+              >
+                <Text size="B400">
+                  {leaveState.status === AsyncStatus.Loading ? 'Leaving...' : 'Leave'}
+                </Text>
+              </Button>
+            </Box>
+          </Dialog>
+        </FocusTrap>
+      </OverlayCenter>
+    </Overlay>
+  );
+}

src/app/components/leave-space-prompt/index.ts

@@ -0,0 +1 @@
+export * from './LeaveSpacePrompt';

src/app/components/media/Image.tsx

@@ -0,0 +1,9 @@
+import React, { ImgHTMLAttributes, forwardRef } from 'react';
+import classNames from 'classnames';
+import * as css from './media.css';
+
+export const Image = forwardRef<HTMLImageElement, ImgHTMLAttributes<HTMLImageElement>>(
+  ({ className, alt, ...props }, ref) => (
+    <img className={classNames(css.Image, className)} alt={alt} {...props} ref={ref} />
+  )
+);

src/app/components/media/MediaControls.tsx

@@ -0,0 +1,27 @@
+import React, { ReactNode } from 'react';
+import { Box, as } from 'folds';
+
+export type MediaControlProps = {
+  before?: ReactNode;
+  after?: ReactNode;
+  leftControl?: ReactNode;
+  rightControl?: ReactNode;
+};
+export const MediaControl = as<'div', MediaControlProps>(
+  ({ before, after, leftControl, rightControl, children, ...props }, ref) => (
+    <Box grow="Yes" direction="Column" gap="300" {...props} ref={ref}>
+      {before && <Box direction="Column">{before}</Box>}
+      <Box alignItems="Center" gap="200">
+        <Box alignItems="Center" grow="Yes" gap="Inherit">
+          {leftControl}
+        </Box>
+
+        <Box justifyItems="End" alignItems="Center" gap="Inherit">
+          {rightControl}
+        </Box>
+      </Box>
+      {after && <Box direction="Column">{after}</Box>}
+      {children}
+    </Box>
+  )
+);

src/app/components/media/Video.tsx

@@ -0,0 +1,10 @@
+import React, { VideoHTMLAttributes, forwardRef } from 'react';
+import classNames from 'classnames';
+import * as css from './media.css';
+
+export const Video = forwardRef<HTMLVideoElement, VideoHTMLAttributes<HTMLVideoElement>>(
+  ({ className, ...props }, ref) => (
+    // eslint-disable-next-line jsx-a11y/media-has-caption
+    <video className={classNames(css.Video, className)} {...props} ref={ref} />
+  )
+);

src/app/components/media/index.ts

@@ -0,0 +1,3 @@
+export * from './Image';
+export * from './Video';
+export * from './MediaControls';

src/app/components/media/media.css.ts

@@ -0,0 +1,20 @@
+import { style } from '@vanilla-extract/css';
+import { DefaultReset } from 'folds';
+
+export const Image = style([
+  DefaultReset,
+  {
+    objectFit: 'cover',
+    width: '100%',
+    height: '100%',
+  },
+]);
+
+export const Video = style([
+  DefaultReset,
+  {
+    objectFit: 'contain',
+    width: '100%',
+    height: '100%',
+  },
+]);

src/app/components/message/FileHeader.tsx

@@ -0,0 +1,22 @@
+import { Badge, Box, Text, as, toRem } from 'folds';
+import React from 'react';
+import { mimeTypeToExt } from '../../utils/mimeTypes';
+
+const badgeStyles = { maxWidth: toRem(100) };
+
+export type FileHeaderProps = {
+  body: string;
+  mimeType: string;
+};
+export const FileHeader = as<'div', FileHeaderProps>(({ body, mimeType, ...props }, ref) => (
+  <Box alignItems="Center" gap="200" grow="Yes" {...props} ref={ref}>
+    <Badge style={badgeStyles} variant="Secondary" radii="Pill">
+      <Text size="O400" truncate>
+        {mimeTypeToExt(mimeType)}
+      </Text>
+    </Badge>
+    <Text size="T300" truncate>
+      {body}
+    </Text>
+  </Box>
+));

src/app/components/message/MsgTypeRenderers.tsx

@@ -0,0 +1,398 @@
+import React, { ReactNode } from 'react';
+import { Box, Chip, Icon, Icons, Text, toRem } from 'folds';
+import { IContent } from 'matrix-js-sdk';
+import { JUMBO_EMOJI_REG, URL_REG } from '../../utils/regex';
+import { trimReplyFromBody } from '../../utils/room';
+import { MessageTextBody } from './layout';
+import {
+  MessageBadEncryptedContent,
+  MessageBrokenContent,
+  MessageDeletedContent,
+  MessageEditedContent,
+  MessageUnsupportedContent,
+} from './content';
+import {
+  IAudioContent,
+  IAudioInfo,
+  IEncryptedFile,
+  IFileContent,
+  IFileInfo,
+  IImageContent,
+  IImageInfo,
+  IThumbnailContent,
+  IVideoContent,
+  IVideoInfo,
+} from '../../../types/matrix/common';
+import { FALLBACK_MIMETYPE, getBlobSafeMimeType } from '../../utils/mimeTypes';
+import { parseGeoUri, scaleYDimension } from '../../utils/common';
+import { Attachment, AttachmentBox, AttachmentContent, AttachmentHeader } from './attachment';
+import { FileHeader } from './FileHeader';
+
+export function MBadEncrypted() {
+  return (
+    <Text>
+      <MessageBadEncryptedContent />
+    </Text>
+  );
+}
+
+type RedactedContentProps = {
+  reason?: string;
+};
+export function RedactedContent({ reason }: RedactedContentProps) {
+  return (
+    <Text>
+      <MessageDeletedContent reason={reason} />
+    </Text>
+  );
+}
+
+export function UnsupportedContent() {
+  return (
+    <Text>
+      <MessageUnsupportedContent />
+    </Text>
+  );
+}
+
+export function BrokenContent() {
+  return (
+    <Text>
+      <MessageBrokenContent />
+    </Text>
+  );
+}
+
+type RenderBodyProps = {
+  body: string;
+  customBody?: string;
+};
+type MTextProps = {
+  edited?: boolean;
+  content: Record<string, unknown>;
+  renderBody: (props: RenderBodyProps) => ReactNode;
+  renderUrlsPreview?: (urls: string[]) => ReactNode;
+};
+export function MText({ edited, content, renderBody, renderUrlsPreview }: MTextProps) {
+  const { body, formatted_body: customBody } = content;
+
+  if (typeof body !== 'string') return <BrokenContent />;
+  const trimmedBody = trimReplyFromBody(body);
+  const urlsMatch = renderUrlsPreview && trimmedBody.match(URL_REG);
+  const urls = urlsMatch ? [...new Set(urlsMatch)] : undefined;
+
+  return (
+    <>
+      <MessageTextBody
+        preWrap={typeof customBody !== 'string'}
+        jumboEmoji={JUMBO_EMOJI_REG.test(trimmedBody)}
+      >
+        {renderBody({
+          body: trimmedBody,
+          customBody: typeof customBody === 'string' ? customBody : undefined,
+        })}
+        {edited && <MessageEditedContent />}
+      </MessageTextBody>
+      {renderUrlsPreview && urls && urls.length > 0 && renderUrlsPreview(urls)}
+    </>
+  );
+}
+
+type MEmoteProps = {
+  displayName: string;
+  edited?: boolean;
+  content: Record<string, unknown>;
+  renderBody: (props: RenderBodyProps) => ReactNode;
+  renderUrlsPreview?: (urls: string[]) => ReactNode;
+};
+export function MEmote({
+  displayName,
+  edited,
+  content,
+  renderBody,
+  renderUrlsPreview,
+}: MEmoteProps) {
+  const { body, formatted_body: customBody } = content;
+
+  if (typeof body !== 'string') return <BrokenContent />;
+  const trimmedBody = trimReplyFromBody(body);
+  const urlsMatch = renderUrlsPreview && trimmedBody.match(URL_REG);
+  const urls = urlsMatch ? [...new Set(urlsMatch)] : undefined;
+
+  return (
+    <>
+      <MessageTextBody
+        emote
+        preWrap={typeof customBody !== 'string'}
+        jumboEmoji={JUMBO_EMOJI_REG.test(trimmedBody)}
+      >
+        <b>{`${displayName} `}</b>
+        {renderBody({
+          body: trimmedBody,
+          customBody: typeof customBody === 'string' ? customBody : undefined,
+        })}
+        {edited && <MessageEditedContent />}
+      </MessageTextBody>
+      {renderUrlsPreview && urls && urls.length > 0 && renderUrlsPreview(urls)}
+    </>
+  );
+}
+
+type MNoticeProps = {
+  edited?: boolean;
+  content: Record<string, unknown>;
+  renderBody: (props: RenderBodyProps) => ReactNode;
+  renderUrlsPreview?: (urls: string[]) => ReactNode;
+};
+export function MNotice({ edited, content, renderBody, renderUrlsPreview }: MNoticeProps) {
+  const { body, formatted_body: customBody } = content;
+
+  if (typeof body !== 'string') return <BrokenContent />;
+  const trimmedBody = trimReplyFromBody(body);
+  const urlsMatch = renderUrlsPreview && trimmedBody.match(URL_REG);
+  const urls = urlsMatch ? [...new Set(urlsMatch)] : undefined;
+
+  return (
+    <>
+      <MessageTextBody
+        notice
+        preWrap={typeof customBody !== 'string'}
+        jumboEmoji={JUMBO_EMOJI_REG.test(trimmedBody)}
+      >
+        {renderBody({
+          body: trimmedBody,
+          customBody: typeof customBody === 'string' ? customBody : undefined,
+        })}
+        {edited && <MessageEditedContent />}
+      </MessageTextBody>
+      {renderUrlsPreview && urls && urls.length > 0 && renderUrlsPreview(urls)}
+    </>
+  );
+}
+
+type RenderImageContentProps = {
+  body: string;
+  info?: IImageInfo & IThumbnailContent;
+  mimeType?: string;
+  url: string;
+  encInfo?: IEncryptedFile;
+};
+type MImageProps = {
+  content: IImageContent;
+  renderImageContent: (props: RenderImageContentProps) => ReactNode;
+  outlined?: boolean;
+};
+export function MImage({ content, renderImageContent, outlined }: MImageProps) {
+  const imgInfo = content?.info;
+  const mxcUrl = content.file?.url ?? content.url;
+  if (typeof mxcUrl !== 'string') {
+    return <BrokenContent />;
+  }
+  const height = scaleYDimension(imgInfo?.w || 400, 400, imgInfo?.h || 400);
+
+  return (
+    <Attachment outlined={outlined}>
+      <AttachmentBox
+        style={{
+          height: toRem(height < 48 ? 48 : height),
+        }}
+      >
+        {renderImageContent({
+          body: content.body || 'Image',
+          info: imgInfo,
+          mimeType: imgInfo?.mimetype,
+          url: mxcUrl,
+          encInfo: content.file,
+        })}
+      </AttachmentBox>
+    </Attachment>
+  );
+}
+
+type RenderVideoContentProps = {
+  body: string;
+  info: IVideoInfo & IThumbnailContent;
+  mimeType: string;
+  url: string;
+  encInfo?: IEncryptedFile;
+};
+type MVideoProps = {
+  content: IVideoContent;
+  renderAsFile: () => ReactNode;
+  renderVideoContent: (props: RenderVideoContentProps) => ReactNode;
+  outlined?: boolean;
+};
+export function MVideo({ content, renderAsFile, renderVideoContent, outlined }: MVideoProps) {
+  const videoInfo = content?.info;
+  const mxcUrl = content.file?.url ?? content.url;
+  const safeMimeType = getBlobSafeMimeType(videoInfo?.mimetype ?? '');
+
+  if (!videoInfo || !safeMimeType.startsWith('video') || typeof mxcUrl !== 'string') {
+    if (mxcUrl) {
+      return renderAsFile();
+    }
+    return <BrokenContent />;
+  }
+
+  const height = scaleYDimension(videoInfo.w || 400, 400, videoInfo.h || 400);
+
+  return (
+    <Attachment outlined={outlined}>
+      <AttachmentBox
+        style={{
+          height: toRem(height < 48 ? 48 : height),
+        }}
+      >
+        {renderVideoContent({
+          body: content.body || 'Video',
+          info: videoInfo,
+          mimeType: safeMimeType,
+          url: mxcUrl,
+          encInfo: content.file,
+        })}
+      </AttachmentBox>
+    </Attachment>
+  );
+}
+
+type RenderAudioContentProps = {
+  info: IAudioInfo;
+  mimeType: string;
+  url: string;
+  encInfo?: IEncryptedFile;
+};
+type MAudioProps = {
+  content: IAudioContent;
+  renderAsFile: () => ReactNode;
+  renderAudioContent: (props: RenderAudioContentProps) => ReactNode;
+  outlined?: boolean;
+};
+export function MAudio({ content, renderAsFile, renderAudioContent, outlined }: MAudioProps) {
+  const audioInfo = content?.info;
+  const mxcUrl = content.file?.url ?? content.url;
+  const safeMimeType = getBlobSafeMimeType(audioInfo?.mimetype ?? '');
+
+  if (!audioInfo || !safeMimeType.startsWith('audio') || typeof mxcUrl !== 'string') {
+    if (mxcUrl) {
+      return renderAsFile();
+    }
+    return <BrokenContent />;
+  }
+
+  return (
+    <Attachment outlined={outlined}>
+      <AttachmentHeader>
+        <FileHeader body={content.body ?? 'Audio'} mimeType={safeMimeType} />
+      </AttachmentHeader>
+      <AttachmentBox>
+        <AttachmentContent>
+          {renderAudioContent({
+            info: audioInfo,
+            mimeType: safeMimeType,
+            url: mxcUrl,
+            encInfo: content.file,
+          })}
+        </AttachmentContent>
+      </AttachmentBox>
+    </Attachment>
+  );
+}
+
+type RenderFileContentProps = {
+  body: string;
+  info: IFileInfo & IThumbnailContent;
+  mimeType: string;
+  url: string;
+  encInfo?: IEncryptedFile;
+};
+type MFileProps = {
+  content: IFileContent;
+  renderFileContent: (props: RenderFileContentProps) => ReactNode;
+  outlined?: boolean;
+};
+export function MFile({ content, renderFileContent, outlined }: MFileProps) {
+  const fileInfo = content?.info;
+  const mxcUrl = content.file?.url ?? content.url;
+
+  if (typeof mxcUrl !== 'string') {
+    return <BrokenContent />;
+  }
+
+  return (
+    <Attachment outlined={outlined}>
+      <AttachmentHeader>
+        <FileHeader
+          body={content.body ?? 'Unnamed File'}
+          mimeType={fileInfo?.mimetype ?? FALLBACK_MIMETYPE}
+        />
+      </AttachmentHeader>
+      <AttachmentBox>
+        <AttachmentContent>
+          {renderFileContent({
+            body: content.body ?? 'File',
+            info: fileInfo ?? {},
+            mimeType: fileInfo?.mimetype ?? FALLBACK_MIMETYPE,
+            url: mxcUrl,
+            encInfo: content.file,
+          })}
+        </AttachmentContent>
+      </AttachmentBox>
+    </Attachment>
+  );
+}
+
+type MLocationProps = {
+  content: IContent;
+};
+export function MLocation({ content }: MLocationProps) {
+  const geoUri = content.geo_uri;
+  if (typeof geoUri !== 'string') return <BrokenContent />;
+  const location = parseGeoUri(geoUri);
+  return (
+    <Box direction="Column" alignItems="Start" gap="100">
+      <Text size="T400">{geoUri}</Text>
+      <Chip
+        as="a"
+        size="400"
+        href={`https://www.openstreetmap.org/?mlat=${location.latitude}&mlon=${location.longitude}#map=16/${location.latitude}/${location.longitude}`}
+        target="_blank"
+        rel="noreferrer noopener"
+        variant="Primary"
+        radii="Pill"
+        before={<Icon src={Icons.External} size="50" />}
+      >
+        <Text size="B300">Open Location</Text>
+      </Chip>
+    </Box>
+  );
+}
+
+type MStickerProps = {
+  content: IImageContent;
+  renderImageContent: (props: RenderImageContentProps) => ReactNode;
+};
+export function MSticker({ content, renderImageContent }: MStickerProps) {
+  const imgInfo = content?.info;
+  const mxcUrl = content.file?.url ?? content.url;
+  if (typeof mxcUrl !== 'string') {
+    return <MessageBrokenContent />;
+  }
+  const height = scaleYDimension(imgInfo?.w || 152, 152, imgInfo?.h || 152);
+
+  return (
+    <AttachmentBox
+      style={{
+        height: toRem(height < 48 ? 48 : height),
+        width: toRem(152),
+      }}
+    >
+      {renderImageContent({
+        body: content.body || 'Sticker',
+        info: imgInfo,
+        mimeType: imgInfo?.mimetype,
+        url: mxcUrl,
+        encInfo: content.file,
+      })}
+    </AttachmentBox>
+  );
+}

src/app/components/message/Reaction.css.ts

@@ -0,0 +1,75 @@
+import { createVar, style } from '@vanilla-extract/css';
+import { DefaultReset, FocusOutline, color, config, toRem } from 'folds';
+
+const Container = createVar();
+const ContainerHover = createVar();
+const ContainerActive = createVar();
+const ContainerLine = createVar();
+const OnContainer = createVar();
+
+export const Reaction = style([
+  FocusOutline,
+  {
+    vars: {
+      [Container]: color.SurfaceVariant.Container,
+      [ContainerHover]: color.SurfaceVariant.ContainerHover,
+      [ContainerActive]: color.SurfaceVariant.ContainerActive,
+      [ContainerLine]: color.SurfaceVariant.ContainerLine,
+      [OnContainer]: color.SurfaceVariant.OnContainer,
+    },
+    padding: `${toRem(2)} ${config.space.S200} ${toRem(2)} ${config.space.S100}`,
+    backgroundColor: Container,
+    border: `${config.borderWidth.B300} solid ${ContainerLine}`,
+    borderRadius: config.radii.R300,
+
+    selectors: {
+      'button&': {
+        cursor: 'pointer',
+      },
+      '&[aria-pressed=true]': {
+        vars: {
+          [Container]: color.Primary.Container,
+          [ContainerHover]: color.Primary.ContainerHover,
+          [ContainerActive]: color.Primary.ContainerActive,
+          [ContainerLine]: color.Primary.ContainerLine,
+          [OnContainer]: color.Primary.OnContainer,
+        },
+        backgroundColor: Container,
+      },
+      '&[aria-selected=true]': {
+        borderColor: color.Secondary.Main,
+        borderWidth: config.borderWidth.B400,
+      },
+      '&:hover, &:focus-visible': {
+        backgroundColor: ContainerHover,
+      },
+      '&:active': {
+        backgroundColor: ContainerActive,
+      },
+      '&[aria-disabled=true], &:disabled': {
+        cursor: 'not-allowed',
+      },
+    },
+  },
+]);
+
+export const ReactionText = style([
+  DefaultReset,
+  {
+    minWidth: 0,
+    maxWidth: toRem(150),
+    display: 'inline-flex',
+    alignItems: 'center',
+    lineHeight: toRem(20),
+  },
+]);
+
+export const ReactionImg = style([
+  DefaultReset,
+  {
+    height: '1em',
+    minWidth: 0,
+    maxWidth: toRem(150),
+    objectFit: 'contain',
+  },
+]);

src/app/components/message/Reaction.tsx

@@ -0,0 +1,113 @@
+import React from 'react';
+import { Box, Text, as } from 'folds';
+import classNames from 'classnames';
+import { MatrixClient, MatrixEvent, Room } from 'matrix-js-sdk';
+import * as css from './Reaction.css';
+import { getHexcodeForEmoji, getShortcodeFor } from '../../plugins/emoji';
+import { getMemberDisplayName } from '../../utils/room';
+import { eventWithShortcode, getMxIdLocalPart } from '../../utils/matrix';
+
+export const Reaction = as<
+  'button',
+  {
+    mx: MatrixClient;
+    count: number;
+    reaction: string;
+  }
+>(({ className, mx, count, reaction, ...props }, ref) => (
+  <Box
+    as="button"
+    className={classNames(css.Reaction, className)}
+    alignItems="Center"
+    shrink="No"
+    gap="200"
+    {...props}
+    ref={ref}
+  >
+    <Text className={css.ReactionText} as="span" size="T400">
+      {reaction.startsWith('mxc://') ? (
+        <img
+          className={css.ReactionImg}
+          src={mx.mxcUrlToHttp(reaction) ?? reaction}
+          alt={reaction}
+        />
+      ) : (
+        <Text as="span" size="Inherit" truncate>
+          {reaction}
+        </Text>
+      )}
+    </Text>
+    <Text as="span" size="T300">
+      {count}
+    </Text>
+  </Box>
+));
+
+type ReactionTooltipMsgProps = {
+  room: Room;
+  reaction: string;
+  events: MatrixEvent[];
+};
+
+export function ReactionTooltipMsg({ room, reaction, events }: ReactionTooltipMsgProps) {
+  const shortCodeEvt = events.find(eventWithShortcode);
+  const shortcode =
+    shortCodeEvt?.getContent().shortcode ??
+    getShortcodeFor(getHexcodeForEmoji(reaction)) ??
+    reaction;
+  const names = events.map(
+    (ev: MatrixEvent) =>
+      getMemberDisplayName(room, ev.getSender() ?? 'Unknown') ??
+      getMxIdLocalPart(ev.getSender() ?? 'Unknown') ??
+      'Unknown'
+  );
+
+  return (
+    <>
+      {names.length === 1 && <b>{names[0]}</b>}
+      {names.length === 2 && (
+        <>
+          <b>{names[0]}</b>
+          <Text as="span" size="Inherit" priority="300">
+            {' and '}
+          </Text>
+          <b>{names[1]}</b>
+        </>
+      )}
+      {names.length === 3 && (
+        <>
+          <b>{names[0]}</b>
+          <Text as="span" size="Inherit" priority="300">
+            {', '}
+          </Text>
+          <b>{names[1]}</b>
+          <Text as="span" size="Inherit" priority="300">
+            {' and '}
+          </Text>
+          <b>{names[2]}</b>
+        </>
+      )}
+      {names.length > 3 && (
+        <>
+          <b>{names[0]}</b>
+          <Text as="span" size="Inherit" priority="300">
+            {', '}
+          </Text>
+          <b>{names[1]}</b>
+          <Text as="span" size="Inherit" priority="300">
+            {', '}
+          </Text>
+          <b>{names[2]}</b>
+          <Text as="span" size="Inherit" priority="300">
+            {' and '}
+          </Text>
+          <b>{names.length - 3} others</b>
+        </>
+      )}
+      <Text as="span" size="Inherit" priority="300">
+        {' reacted with '}
+      </Text>
+      :<b>{shortcode}</b>:
+    </>
+  );
+}

src/app/components/message/RenderBody.tsx

@@ -0,0 +1,36 @@
+import React from 'react';
+import parse, { HTMLReactParserOptions } from 'html-react-parser';
+import Linkify from 'linkify-react';
+import { Opts } from 'linkifyjs';
+import { MessageEmptyContent } from './content';
+import { sanitizeCustomHtml } from '../../utils/sanitize';
+import { highlightText, scaleSystemEmoji } from '../../plugins/react-custom-html-parser';
+
+type RenderBodyProps = {
+  body: string;
+  customBody?: string;
+
+  highlightRegex?: RegExp;
+  htmlReactParserOptions: HTMLReactParserOptions;
+  linkifyOpts: Opts;
+};
+export function RenderBody({
+  body,
+  customBody,
+  highlightRegex,
+  htmlReactParserOptions,
+  linkifyOpts,
+}: RenderBodyProps) {
+  if (body === '') <MessageEmptyContent />;
+  if (customBody) {
+    if (customBody === '') <MessageEmptyContent />;
+    return parse(sanitizeCustomHtml(customBody), htmlReactParserOptions);
+  }
+  return (
+    <Linkify options={linkifyOpts}>
+      {highlightRegex
+        ? highlightText(highlightRegex, scaleSystemEmoji(body))
+        : scaleSystemEmoji(body)}
+    </Linkify>
+  );
+}

src/app/components/message/Reply.css.ts

@@ -0,0 +1,28 @@
+import { style } from '@vanilla-extract/css';
+import { config, toRem } from 'folds';
+
+export const ReplyBend = style({
+  flexShrink: 0,
+});
+
+export const Reply = style({
+  marginBottom: toRem(1),
+  minWidth: 0,
+  maxWidth: '100%',
+  minHeight: config.lineHeight.T300,
+  selectors: {
+    'button&': {
+      cursor: 'pointer',
+    },
+  },
+});
+
+export const ReplyContent = style({
+  opacity: config.opacity.P300,
+
+  selectors: {
+    [`${Reply}:hover &`]: {
+      opacity: config.opacity.P500,
+    },
+  },
+});

src/app/components/message/Reply.tsx

@@ -0,0 +1,114 @@
+import { Box, Icon, Icons, Text, as, color, toRem } from 'folds';
+import { EventTimelineSet, MatrixClient, MatrixEvent, Room } from 'matrix-js-sdk';
+import { CryptoBackend } from 'matrix-js-sdk/lib/common-crypto/CryptoBackend';
+import React, { ReactNode, useEffect, useMemo, useState } from 'react';
+import to from 'await-to-js';
+import classNames from 'classnames';
+import colorMXID from '../../../util/colorMXID';
+import { getMemberDisplayName, trimReplyFromBody } from '../../utils/room';
+import { getMxIdLocalPart } from '../../utils/matrix';
+import { LinePlaceholder } from './placeholder';
+import { randomNumberBetween } from '../../utils/common';
+import * as css from './Reply.css';
+import { MessageBadEncryptedContent, MessageDeletedContent, MessageFailedContent } from './content';
+import { scaleSystemEmoji } from '../../plugins/react-custom-html-parser';
+
+type ReplyLayoutProps = {
+  userColor?: string;
+  username?: ReactNode;
+};
+export const ReplyLayout = as<'div', ReplyLayoutProps>(
+  ({ username, userColor, className, children, ...props }, ref) => (
+    <Box
+      className={classNames(css.Reply, className)}
+      alignItems="Center"
+      gap="100"
+      {...props}
+      ref={ref}
+    >
+      <Box style={{ color: userColor, maxWidth: toRem(200) }} alignItems="Center" shrink="No">
+        <Icon size="100" src={Icons.ReplyArrow} />
+        {username}
+      </Box>
+      <Box grow="Yes" className={css.ReplyContent}>
+        {children}
+      </Box>
+    </Box>
+  )
+);
+
+type ReplyProps = {
+  mx: MatrixClient;
+  room: Room;
+  timelineSet?: EventTimelineSet;
+  eventId: string;
+};
+
+export const Reply = as<'div', ReplyProps>(({ mx, room, timelineSet, eventId, ...props }, ref) => {
+  const [replyEvent, setReplyEvent] = useState<MatrixEvent | null | undefined>(
+    timelineSet?.findEventById(eventId)
+  );
+  const placeholderWidth = useMemo(() => randomNumberBetween(40, 400), []);
+
+  const { body } = replyEvent?.getContent() ?? {};
+  const sender = replyEvent?.getSender();
+
+  const fallbackBody = replyEvent?.isRedacted() ? (
+    <MessageDeletedContent />
+  ) : (
+    <MessageFailedContent />
+  );
+
+  useEffect(() => {
+    let disposed = false;
+    const loadEvent = async () => {
+      const [err, evt] = await to(mx.fetchRoomEvent(room.roomId, eventId));
+      const mEvent = new MatrixEvent(evt);
+      if (disposed) return;
+      if (err) {
+        setReplyEvent(null);
+        return;
+      }
+      if (mEvent.isEncrypted() && mx.getCrypto()) {
+        await to(mEvent.attemptDecryption(mx.getCrypto() as CryptoBackend));
+      }
+      setReplyEvent(mEvent);
+    };
+    if (replyEvent === undefined) loadEvent();
+    return () => {
+      disposed = true;
+    };
+  }, [replyEvent, mx, room, eventId]);
+
+  const badEncryption = replyEvent?.getContent().msgtype === 'm.bad.encrypted';
+  const bodyJSX = body ? scaleSystemEmoji(trimReplyFromBody(body)) : fallbackBody;
+
+  return (
+    <ReplyLayout
+      userColor={sender ? colorMXID(sender) : undefined}
+      username={
+        sender && (
+          <Text size="T300" truncate>
+            <b>{getMemberDisplayName(room, sender) ?? getMxIdLocalPart(sender)}</b>
+          </Text>
+        )
+      }
+      {...props}
+      ref={ref}
+    >
+      {replyEvent !== undefined ? (
+        <Text size="T300" truncate>
+          {badEncryption ? <MessageBadEncryptedContent /> : bodyJSX}
+        </Text>
+      ) : (
+        <LinePlaceholder
+          style={{
+            backgroundColor: color.SurfaceVariant.ContainerActive,
+            maxWidth: toRem(placeholderWidth),
+            width: '100%',
+          }}
+        />
+      )}
+    </ReplyLayout>
+  );
+});

src/app/components/message/Time.tsx

@@ -0,0 +1,29 @@
+import React, { ComponentProps } from 'react';
+import { Text, as } from 'folds';
+import { timeDayMonYear, timeHourMinute, today, yesterday } from '../../utils/time';
+
+export type TimeProps = {
+  compact?: boolean;
+  ts: number;
+};
+
+export const Time = as<'span', TimeProps & ComponentProps<typeof Text>>(
+  ({ compact, ts, ...props }, ref) => {
+    let time = '';
+    if (compact) {
+      time = timeHourMinute(ts);
+    } else if (today(ts)) {
+      time = timeHourMinute(ts);
+    } else if (yesterday(ts)) {
+      time = `Yesterday ${timeHourMinute(ts)}`;
+    } else {
+      time = `${timeDayMonYear(ts)} ${timeHourMinute(ts)}`;
+    }
+
+    return (
+      <Text as="time" style={{ flexShrink: 0 }} size="T200" priority="300" {...props} ref={ref}>
+        {time}
+      </Text>
+    );
+  }
+);

src/app/components/message/attachment/Attachment.css.ts

@@ -0,0 +1,42 @@
+import { style } from '@vanilla-extract/css';
+import { RecipeVariants, recipe } from '@vanilla-extract/recipes';
+import { DefaultReset, color, config, toRem } from 'folds';
+
+export const Attachment = recipe({
+  base: {
+    backgroundColor: color.SurfaceVariant.Container,
+    color: color.SurfaceVariant.OnContainer,
+    borderRadius: config.radii.R400,
+    overflow: 'hidden',
+    maxWidth: '100%',
+    width: toRem(400),
+  },
+  variants: {
+    outlined: {
+      true: {
+        boxShadow: `inset 0 0 0 ${config.borderWidth.B300} ${color.SurfaceVariant.ContainerLine}`,
+      },
+    },
+  },
+});
+
+export type AttachmentVariants = RecipeVariants<typeof Attachment>;
+
+export const AttachmentHeader = style({
+  padding: config.space.S300,
+});
+
+export const AttachmentBox = style([
+  DefaultReset,
+  {
+    maxWidth: '100%',
+    maxHeight: toRem(600),
+    width: toRem(400),
+    overflow: 'hidden',
+  },
+]);
+
+export const AttachmentContent = style({
+  padding: config.space.S300,
+  paddingTop: 0,
+});

src/app/components/message/attachment/Attachment.tsx

@@ -0,0 +1,44 @@
+import React from 'react';
+import { Box, as } from 'folds';
+import classNames from 'classnames';
+import * as css from './Attachment.css';
+
+export const Attachment = as<'div', css.AttachmentVariants>(
+  ({ className, outlined, ...props }, ref) => (
+    <Box
+      display="InlineFlex"
+      direction="Column"
+      className={classNames(css.Attachment({ outlined }), className)}
+      {...props}
+      ref={ref}
+    />
+  )
+);
+
+export const AttachmentHeader = as<'div'>(({ className, ...props }, ref) => (
+  <Box
+    shrink="No"
+    gap="200"
+    className={classNames(css.AttachmentHeader, className)}
+    {...props}
+    ref={ref}
+  />
+));
+
+export const AttachmentBox = as<'div'>(({ className, ...props }, ref) => (
+  <Box
+    direction="Column"
+    className={classNames(css.AttachmentBox, className)}
+    {...props}
+    ref={ref}
+  />
+));
+
+export const AttachmentContent = as<'div'>(({ className, ...props }, ref) => (
+  <Box
+    direction="Column"
+    className={classNames(css.AttachmentContent, className)}
+    {...props}
+    ref={ref}
+  />
+));

src/app/components/message/attachment/index.ts

@@ -0,0 +1 @@
+export * from './Attachment';

src/app/components/message/content/AudioContent.tsx

@@ -0,0 +1,199 @@
+/* eslint-disable jsx-a11y/media-has-caption */
+import React, { ReactNode, useCallback, useRef, useState } from 'react';
+import { Badge, Chip, Icon, IconButton, Icons, ProgressBar, Spinner, Text, toRem } from 'folds';
+import { EncryptedAttachmentInfo } from 'browser-encrypt-attachment';
+import { Range } from 'react-range';
+import { useMatrixClient } from '../../../hooks/useMatrixClient';
+import { AsyncStatus, useAsyncCallback } from '../../../hooks/useAsyncCallback';
+import { getFileSrcUrl } from './util';
+import { IAudioInfo } from '../../../../types/matrix/common';
+import {
+  PlayTimeCallback,
+  useMediaLoading,
+  useMediaPlay,
+  useMediaPlayTimeCallback,
+  useMediaSeek,
+  useMediaVolume,
+} from '../../../hooks/media';
+import { useThrottle } from '../../../hooks/useThrottle';
+import { secondsToMinutesAndSeconds } from '../../../utils/common';
+
+const PLAY_TIME_THROTTLE_OPS = {
+  wait: 500,
+  immediate: true,
+};
+
+type RenderMediaControlProps = {
+  after: ReactNode;
+  leftControl: ReactNode;
+  rightControl: ReactNode;
+  children: ReactNode;
+};
+export type AudioContentProps = {
+  mimeType: string;
+  url: string;
+  info: IAudioInfo;
+  encInfo?: EncryptedAttachmentInfo;
+  renderMediaControl: (props: RenderMediaControlProps) => ReactNode;
+};
+export function AudioContent({
+  mimeType,
+  url,
+  info,
+  encInfo,
+  renderMediaControl,
+}: AudioContentProps) {
+  const mx = useMatrixClient();
+
+  const [srcState, loadSrc] = useAsyncCallback(
+    useCallback(
+      () => getFileSrcUrl(mx.mxcUrlToHttp(url) ?? '', mimeType, encInfo),
+      [mx, url, mimeType, encInfo]
+    )
+  );
+
+  const audioRef = useRef<HTMLAudioElement | null>(null);
+
+  const [currentTime, setCurrentTime] = useState(0);
+  // duration in seconds. (NOTE: info.duration is in milliseconds)
+  const infoDuration = info.duration ?? 0;
+  const [duration, setDuration] = useState((infoDuration >= 0 ? infoDuration : 0) / 1000);
+
+  const getAudioRef = useCallback(() => audioRef.current, []);
+  const { loading } = useMediaLoading(getAudioRef);
+  const { playing, setPlaying } = useMediaPlay(getAudioRef);
+  const { seek } = useMediaSeek(getAudioRef);
+  const { volume, mute, setMute, setVolume } = useMediaVolume(getAudioRef);
+  const handlePlayTimeCallback: PlayTimeCallback = useCallback((d, ct) => {
+    setDuration(d);
+    setCurrentTime(ct);
+  }, []);
+  useMediaPlayTimeCallback(
+    getAudioRef,
+    useThrottle(handlePlayTimeCallback, PLAY_TIME_THROTTLE_OPS)
+  );
+
+  const handlePlay = () => {
+    if (srcState.status === AsyncStatus.Success) {
+      setPlaying(!playing);
+    } else if (srcState.status !== AsyncStatus.Loading) {
+      loadSrc();
+    }
+  };
+
+  return renderMediaControl({
+    after: (
+      <Range
+        step={1}
+        min={0}
+        max={duration || 1}
+        values={[currentTime]}
+        onChange={(values) => seek(values[0])}
+        renderTrack={(params) => (
+          <div {...params.props}>
+            {params.children}
+            <ProgressBar
+              as="div"
+              variant="Secondary"
+              size="300"
+              min={0}
+              max={duration}
+              value={currentTime}
+              radii="300"
+            />
+          </div>
+        )}
+        renderThumb={(params) => (
+          <Badge
+            size="300"
+            variant="Secondary"
+            fill="Solid"
+            radii="Pill"
+            outlined
+            {...params.props}
+            style={{
+              ...params.props.style,
+              zIndex: 0,
+            }}
+          />
+        )}
+      />
+    ),
+    leftControl: (
+      <>
+        <Chip
+          onClick={handlePlay}
+          variant="Secondary"
+          radii="300"
+          disabled={srcState.status === AsyncStatus.Loading}
+          before={
+            srcState.status === AsyncStatus.Loading || loading ? (
+              <Spinner variant="Secondary" size="50" />
+            ) : (
+              <Icon src={playing ? Icons.Pause : Icons.Play} size="50" filled={playing} />
+            )
+          }
+        >
+          <Text size="B300">{playing ? 'Pause' : 'Play'}</Text>
+        </Chip>
+
+        <Text size="T200">{`${secondsToMinutesAndSeconds(
+          currentTime
+        )} / ${secondsToMinutesAndSeconds(duration)}`}</Text>
+      </>
+    ),
+    rightControl: (
+      <>
+        <IconButton
+          variant="SurfaceVariant"
+          size="300"
+          radii="Pill"
+          onClick={() => setMute(!mute)}
+          aria-pressed={mute}
+        >
+          <Icon src={mute ? Icons.VolumeMute : Icons.VolumeHigh} size="50" />
+        </IconButton>
+        <Range
+          step={0.1}
+          min={0}
+          max={1}
+          values={[volume]}
+          onChange={(values) => setVolume(values[0])}
+          renderTrack={(params) => (
+            <div {...params.props}>
+              {params.children}
+              <ProgressBar
+                style={{ width: toRem(48) }}
+                variant="Secondary"
+                size="300"
+                min={0}
+                max={1}
+                value={volume}
+                radii="300"
+              />
+            </div>
+          )}
+          renderThumb={(params) => (
+            <Badge
+              size="300"
+              variant="Secondary"
+              fill="Solid"
+              radii="Pill"
+              outlined
+              {...params.props}
+              style={{
+                ...params.props.style,
+                zIndex: 0,
+              }}
+            />
+          )}
+        />
+      </>
+    ),
+    children: (
+      <audio controls={false} autoPlay ref={audioRef}>
+        {srcState.status === AsyncStatus.Success && <source src={srcState.data} type={mimeType} />}
+      </audio>
+    ),
+  });
+}

src/app/components/message/content/EventContent.tsx

@@ -0,0 +1,37 @@
+import { Box, Icon, IconSrc } from 'folds';
+import React, { ReactNode } from 'react';
+import { CompactLayout, ModernLayout } from '..';
+
+export type EventContentProps = {
+  messageLayout: number;
+  time: ReactNode;
+  iconSrc: IconSrc;
+  content: ReactNode;
+};
+export function EventContent({ messageLayout, time, iconSrc, content }: EventContentProps) {
+  const beforeJSX = (
+    <Box gap="300" justifyContent="SpaceBetween" alignItems="Center" grow="Yes">
+      {messageLayout === 1 && time}
+      <Box
+        grow={messageLayout === 1 ? undefined : 'Yes'}
+        alignItems="Center"
+        justifyContent="Center"
+      >
+        <Icon style={{ opacity: 0.6 }} size="50" src={iconSrc} />
+      </Box>
+    </Box>
+  );
+
+  const msgContentJSX = (
+    <Box justifyContent="SpaceBetween" alignItems="Baseline" gap="200">
+      {content}
+      {messageLayout !== 1 && time}
+    </Box>
+  );
+
+  return messageLayout === 1 ? (
+    <CompactLayout before={beforeJSX}>{msgContentJSX}</CompactLayout>
+  ) : (
+    <ModernLayout before={beforeJSX}>{msgContentJSX}</ModernLayout>
+  );
+}

src/app/components/message/content/FallbackContent.tsx

@@ -0,0 +1,66 @@
+import { Box, Icon, Icons, Text, as, color, config } from 'folds';
+import React from 'react';
+
+const warningStyle = { color: color.Warning.Main, opacity: config.opacity.P300 };
+const criticalStyle = { color: color.Critical.Main, opacity: config.opacity.P300 };
+
+export const MessageDeletedContent = as<'div', { children?: never; reason?: string }>(
+  ({ reason, ...props }, ref) => (
+    <Box as="span" alignItems="Center" gap="100" style={warningStyle} {...props} ref={ref}>
+      <Icon size="50" src={Icons.Delete} />
+      {reason ? (
+        <i>This message has been deleted. {reason}</i>
+      ) : (
+        <i>This message has been deleted</i>
+      )}
+    </Box>
+  )
+);
+
+export const MessageUnsupportedContent = as<'div', { children?: never }>(({ ...props }, ref) => (
+  <Box as="span" alignItems="Center" gap="100" style={criticalStyle} {...props} ref={ref}>
+    <Icon size="50" src={Icons.Warning} />
+    <i>Unsupported message</i>
+  </Box>
+));
+
+export const MessageFailedContent = as<'div', { children?: never }>(({ ...props }, ref) => (
+  <Box as="span" alignItems="Center" gap="100" style={criticalStyle} {...props} ref={ref}>
+    <Icon size="50" src={Icons.Warning} />
+    <i>Failed to load message</i>
+  </Box>
+));
+
+export const MessageBadEncryptedContent = as<'div', { children?: never }>(({ ...props }, ref) => (
+  <Box as="span" alignItems="Center" gap="100" style={warningStyle} {...props} ref={ref}>
+    <Icon size="50" src={Icons.Lock} />
+    <i>Unable to decrypt message</i>
+  </Box>
+));
+
+export const MessageNotDecryptedContent = as<'div', { children?: never }>(({ ...props }, ref) => (
+  <Box as="span" alignItems="Center" gap="100" style={warningStyle} {...props} ref={ref}>
+    <Icon size="50" src={Icons.Lock} />
+    <i>This message is not decrypted yet</i>
+  </Box>
+));
+
+export const MessageBrokenContent = as<'div', { children?: never }>(({ ...props }, ref) => (
+  <Box as="span" alignItems="Center" gap="100" style={criticalStyle} {...props} ref={ref}>
+    <Icon size="50" src={Icons.Warning} />
+    <i>Broken message</i>
+  </Box>
+));
+
+export const MessageEmptyContent = as<'div', { children?: never }>(({ ...props }, ref) => (
+  <Box as="span" alignItems="Center" gap="100" style={criticalStyle} {...props} ref={ref}>
+    <Icon size="50" src={Icons.Warning} />
+    <i>Empty message</i>
+  </Box>
+));
+
+export const MessageEditedContent = as<'span', { children?: never }>(({ ...props }, ref) => (
+  <Text as="span" size="T200" priority="300" {...props} ref={ref}>
+    {' (edited)'}
+  </Text>
+));