feat(calls): 3-tier mic noise suppression with on-device ML (P5-30)

Replace the boolean call noise-suppression setting with a 3-way control
(Off / Browser-native / ML beta) in Settings -> General -> Calls.

- Off: noiseSuppression=false to Element Call
- Browser-native: EC's built-in WebRTC suppressor (prior default)
- ML (beta): on-device RNNoise (@sapphi-red/web-noise-suppressor)

Element Call captures the mic inside its iframe and publishes to LiveKit,
so the host can't reach that track; LiveKit's Krisp filter is Cloud-only
(we self-host the SFU) and EC's own RNNoise PR #3892 is unmerged. The ML
tier instead injects a same-origin pre-init shim into the vendored EC
index.html (build/lotus-denoise.js, wired by the lotusDenoise vite plugin)
that patches getUserMedia and routes the captured mic through an RNNoise
AudioWorklet before LiveKit sees it -- the same post-capture pipeline as
#3892, with no EC fork/AGPL/rebase burden. Falls back to the raw mic if
setup fails; keeps echoCancellation/AGC on the raw capture.

- settings.ts: callNoiseSuppression -> 'off'|'browser'|'ml' + legacy
  boolean migration (true->browser, false->off)
- CallEmbed/useCallEmbed: tier maps to noiseSuppression param and appends
  lotusDenoise=ml (native suppressor off in ML mode)
- vite.config.js: copy RNNoise worklet/wasm + shim into the EC bundle and
  inject the shim <script> before EC's module entry
- docs: LOTUS_FEATURES.md, LOTUS_TODO.md (P5-30 done)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

LOTUS_FEATURES.md

@@ -405,9 +405,32 @@ A local sound plays when another participant joins or leaves a call you're in.
 
 Files: `src/app/utils/callSounds.ts`, `src/app/hooks/useCallJoinLeaveSounds.ts`
 
-### Noise Suppression Toggle
+### Noise Suppression (3-Tier, incl. on-device ML) (P5-30)
 
-A `noiseSuppression` URL parameter is passed to the Element Call widget URL, allowing the noise suppression feature to be toggled from within Lotus settings.
+A three-way mic noise-suppression control in **Settings → General → Calls**:
+
+| Tier | What it does |
+|---|---|
+| **Off** | No suppression (`noiseSuppression=false` to Element Call). |
+| **Browser-native** | Element Call's built-in WebRTC suppressor (`noiseSuppression=true`). Default. |
+| **ML (beta)** | On-device RNNoise — Krisp-style removal of fans, keyboards, dogs, etc. |
+
+**Why a shim, not a fork:** Element Call captures the mic *inside* its iframe and publishes to LiveKit; the host can't reach that track. LiveKit's Krisp filter is LiveKit-Cloud-only (we self-host the SFU), and EC's own RNNoise work (PR #3892) is unmerged. So the **ML tier** is delivered by injecting a same-origin pre-init script into the vendored EC `index.html` that monkeypatches `getUserMedia` and routes the captured mic through an RNNoise `AudioWorklet` (`@sapphi-red/web-noise-suppressor`) before LiveKit ever sees it — the same post-capture pipeline #3892 uses, executed from the realm we already control. Works on the self-hosted LiveKit SFU, survives EC version bumps, no EC fork/AGPL/rebase burden.
+
+**How it's wired:**
+
+- `callNoiseSuppression` setting is `'off' | 'browser' | 'ml'` (legacy boolean migrates: `true`→`browser`, `false`→`off`)
+- `CallEmbed.getWidget()` maps the tier to the `noiseSuppression` URL param and appends `lotusDenoise=ml` for the ML tier (browser-native suppressor is disabled in ML mode so RNNoise owns suppression)
+- The `lotusDenoise` vite plugin copies the RNNoise worklet + wasm into `public/element-call/denoise/`, copies the shim, and injects `<script src="./lotus-denoise.js">` before EC's module entry
+- The shim keeps `echoCancellation`/`autoGainControl` on the raw capture and falls back to the raw mic if RNNoise setup fails, so calls never break
+
+**Known beta caveat:** routing capture through WebAudio can weaken the browser's acoustic echo cancellation (AEC runs on the native capture track) — the same tradeoff EC's upstream feature makes; hence the "beta" label.
+
+### Files
+
+- `build/lotus-denoise.js` — injected RNNoise getUserMedia shim (classic script)
+- `vite.config.js` — `lotusDenoise()` plugin (asset copy + index.html injection)
+- `src/app/plugins/call/CallEmbed.ts` — tier → widget URL params
 
 ### Call Button Scoping
 

LOTUS_TODO.md

@@ -243,12 +243,12 @@ Themes:
 
 ---
 
-### [ ] P5-30 · Advanced ML Noise Suppression (Krisp-style)
+### [x] P5-30 · Advanced ML Noise Suppression (Krisp-style)
 
-**What:** High-end background noise cancellation using a pre-trained ML model (e.g. RNNoise) running in the browser. Removes dogs, fans, and keyboard clicks from the mic stream.  
-**Note:** This is a top-tier feature request and an EXTREME COMPLEXITY project.  
-**[AUDIT REQUIRED]** Must verify if mixing a processed stream into Element Call's WebRTC implementation causes latency or AEC (Echo Cancellation) issues.  
-**Complexity:** Extreme.
+**What:** High-end background noise cancellation using a pre-trained ML model (RNNoise) running in the browser. Removes dogs, fans, and keyboard clicks from the mic stream.  
+**Shipped:** 3-tier setting (Off / Browser-native / ML beta) in Settings → General → Calls. ML tier injects a same-origin pre-init shim into the vendored Element Call `index.html` that monkeypatches `getUserMedia` and routes the captured mic through an RNNoise `AudioWorklet` (`@sapphi-red/web-noise-suppressor`) before LiveKit publishes — no EC fork required. See LOTUS_FEATURES.md → "Noise Suppression (3-Tier)".  
+**Key decision:** LiveKit's Krisp filter is LiveKit-Cloud-only (we self-host the SFU); EC's own RNNoise PR #3892 is unmerged. The shim is the same post-capture pipeline #3892 uses, executed from the realm we control, so it survives EC version bumps.  
+**AEC note (resolved-as-accepted):** WebAudio capture routing can weaken browser AEC (AEC runs on the native track) — same tradeoff as EC's upstream feature; mitigated by keeping `echoCancellation`/`autoGainControl` on the raw capture and labeling the tier "beta". Validate echo quality on real multi-party calls after deploy.
 
 ---
 

build/lotus-denoise.js

@@ -0,0 +1,155 @@
+/*
+ * Lotus Chat — client-side ML noise suppression shim for Element Call.
+ *
+ * Element Call runs as a same-origin iframe widget that captures the mic
+ * internally (via livekit-client -> getUserMedia) and publishes it to LiveKit.
+ * We can't reach that track from the host. Instead this classic <script> is
+ * injected (by the vite `lotus-denoise` plugin) into EC's index.html BEFORE its
+ * deferred module entry, so it runs first and monkeypatches getUserMedia. When
+ * the "ml" tier is selected (lotusDenoise=ml in the widget URL) we route the
+ * captured mic through an RNNoise AudioWorklet (@sapphi-red/web-noise-suppressor)
+ * and hand the processed track back to EC/LiveKit.
+ *
+ * This mirrors Element Call's own (still-unmerged) PR #3892 pipeline, executed
+ * from the realm we already control instead of forking and rebuilding EC.
+ *
+ * Known beta caveat: routing capture through WebAudio can weaken the browser's
+ * acoustic echo cancellation (AEC operates on the native capture track). We keep
+ * echoCancellation/autoGainControl enabled on the raw capture to mitigate.
+ */
+(function () {
+  'use strict';
+
+  try {
+    var params = new URLSearchParams(window.location.search);
+    if (params.get('lotusDenoise') !== 'ml') return;
+  } catch (e) {
+    return;
+  }
+
+  var md = navigator.mediaDevices;
+  if (!md || typeof md.getUserMedia !== 'function') return;
+  if (typeof AudioWorkletNode === 'undefined' || typeof AudioContext === 'undefined') return;
+
+  var PROCESSOR_NAME = '@sapphi-red/web-noise-suppressor/rnnoise';
+  var ASSET_BASE = './denoise/';
+  var SAMPLE_RATE = 48000; // RNNoise worklet assumes 48kHz
+
+  var origGetUserMedia = md.getUserMedia.bind(md);
+  var wasmPromise = null;
+
+  // SIMD feature detection (bytes from @sapphi-red/web-noise-suppressor / wasm-feature-detect)
+  function hasSimd() {
+    try {
+      return WebAssembly.validate(
+        new Uint8Array([
+          0, 97, 115, 109, 1, 0, 0, 0, 1, 5, 1, 96, 0, 1, 123, 3, 2, 1, 0, 10, 10, 1, 8, 0, 65, 0,
+          253, 15, 253, 98, 11,
+        ])
+      );
+    } catch (e) {
+      return false;
+    }
+  }
+
+  function loadWasm() {
+    if (!wasmPromise) {
+      var url = ASSET_BASE + (hasSimd() ? 'rnnoise_simd.wasm' : 'rnnoise.wasm');
+      wasmPromise = fetch(url).then(function (r) {
+        if (!r.ok) throw new Error('rnnoise wasm fetch failed: ' + r.status);
+        return r.arrayBuffer();
+      });
+    }
+    return wasmPromise;
+  }
+
+  function processStream(stream) {
+    var audioTracks = stream.getAudioTracks();
+    if (audioTracks.length === 0) return Promise.resolve(stream);
+
+    return loadWasm()
+      .then(function (wasmBinary) {
+        var ctx = new AudioContext({ sampleRate: SAMPLE_RATE });
+        return ctx.audioWorklet
+          .addModule(ASSET_BASE + 'rnnoiseWorklet.js')
+          .then(function () {
+            if (ctx.state === 'suspended') return ctx.resume().then(function () { return ctx; });
+            return ctx;
+          })
+          .then(function () {
+            var node = new AudioWorkletNode(ctx, PROCESSOR_NAME, {
+              processorOptions: { maxChannels: 1, wasmBinary: wasmBinary },
+            });
+            var source = ctx.createMediaStreamSource(stream);
+            var dest = ctx.createMediaStreamDestination();
+            source.connect(node).connect(dest);
+
+            var origTrack = audioTracks[0];
+            var processedTrack = dest.stream.getAudioTracks()[0];
+
+            var torndown = false;
+            function cleanup() {
+              if (torndown) return;
+              torndown = true;
+              try {
+                node.port.postMessage('destroy');
+              } catch (e) {}
+              try {
+                source.disconnect();
+                node.disconnect();
+              } catch (e) {}
+              try {
+                origTrack.stop();
+              } catch (e) {}
+              try {
+                ctx.close();
+              } catch (e) {}
+            }
+
+            // When EC stops the track we handed it, release the raw capture + graph.
+            var rawStop = processedTrack.stop.bind(processedTrack);
+            processedTrack.stop = function () {
+              cleanup();
+              rawStop();
+            };
+            // Device unplugged / capture ended involuntarily.
+            origTrack.addEventListener('ended', function () {
+              try {
+                rawStop();
+              } catch (e) {}
+              cleanup();
+            });
+
+            // Return a stream with the processed audio plus any original video.
+            var out = new MediaStream();
+            out.addTrack(processedTrack);
+            stream.getVideoTracks().forEach(function (t) {
+              out.addTrack(t);
+            });
+            return out;
+          });
+      })
+      .catch(function (e) {
+        // Any failure -> fall back to the raw mic so calls never break.
+        // eslint-disable-next-line no-console
+        console.error('[lotus-denoise] RNNoise setup failed, using raw mic', e);
+        return stream;
+      });
+  }
+
+  navigator.mediaDevices.getUserMedia = function (constraints) {
+    var wantsAudio = !!(constraints && constraints.audio);
+    var effective = constraints;
+    if (wantsAudio) {
+      // RNNoise owns noise suppression; keep AEC + AGC on the raw capture.
+      var audioC = typeof constraints.audio === 'object' ? Object.assign({}, constraints.audio) : {};
+      audioC.noiseSuppression = false;
+      if (audioC.echoCancellation === undefined) audioC.echoCancellation = true;
+      if (audioC.autoGainControl === undefined) audioC.autoGainControl = true;
+      effective = Object.assign({}, constraints, { audio: audioC });
+    }
+    return origGetUserMedia(effective).then(function (stream) {
+      return wantsAudio ? processStream(stream) : stream;
+    });
+  };
+})();

package-lock.json

@@ -20,6 +20,7 @@
         "@giphy/js-types": "5.1.0",
         "@giphy/js-util": "5.2.0",
         "@giphy/react-components": "10.1.2",
+        "@sapphi-red/web-noise-suppressor": "0.3.5",
         "@sentry/react": "10.53.1",
         "@tanstack/react-query": "5.100.13",
         "@tanstack/react-query-devtools": "5.100.13",
@@ -3774,6 +3775,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@sapphi-red/web-noise-suppressor": {
+      "version": "0.3.5",
+      "resolved": "https://registry.npmjs.org/@sapphi-red/web-noise-suppressor/-/web-noise-suppressor-0.3.5.tgz",
+      "integrity": "sha512-jh3+V9yM+zxLriQexoGm0GatoPaJWjs6ypFIbFYwQp+AoUb55eUXrjKtKQyuC5zShzzeAQUl0M5JzqB7SSrsRA==",
+      "license": "MIT"
+    },
     "node_modules/@sentry-internal/browser-utils": {
       "version": "10.53.1",
       "resolved": "https://registry.npmjs.org/@sentry-internal/browser-utils/-/browser-utils-10.53.1.tgz",

package.json

@@ -44,6 +44,7 @@
     "@giphy/js-types": "5.1.0",
     "@giphy/js-util": "5.2.0",
     "@giphy/react-components": "10.1.2",
+    "@sapphi-red/web-noise-suppressor": "0.3.5",
     "@sentry/react": "10.53.1",
     "@tanstack/react-query": "5.100.13",
     "@tanstack/react-query-devtools": "5.100.13",

src/app/features/settings/general/General.tsx

@@ -42,13 +42,11 @@ import {
   DateFormat,
   MessageLayout,
   MessageSpacing,
+  NoiseSuppressionMode,
   Settings,
   settingsAtom,
 } from '../../../state/settings';
-import {
-  SeasonalPreview,
-  SeasonTheme,
-} from '../../../components/seasonal/SeasonalEffect';
+import { SeasonalPreview, SeasonTheme } from '../../../components/seasonal/SeasonalEffect';
 import { SettingTile } from '../../../components/setting-tile';
 import { KeySymbol } from '../../../utils/key-symbol';
 import { isMacOS } from '../../../utils/user-agent';
@@ -1235,12 +1233,16 @@ function Calls() {
       <SequenceCard className={SequenceCardStyle} variant="SurfaceVariant" direction="Column">
         <SettingTile
           title="Noise Suppression"
-          description="Apply AI noise suppression to filter background noise during calls (powered by Element Call)."
+          description="Filter background noise from your mic during calls. Browser-native uses the built-in WebRTC suppressor; ML runs on-device RNNoise for stronger, Krisp-style removal (higher CPU)."
           after={
-            <Switch
-              variant="Primary"
+            <SettingsSelect<NoiseSuppressionMode>
               value={callNoiseSuppression}
               onChange={setCallNoiseSuppression}
+              options={[
+                { value: 'off', label: 'Off' },
+                { value: 'browser', label: 'Browser-native' },
+                { value: 'ml', label: 'ML (beta)' },
+              ]}
             />
           }
         />
@@ -1346,22 +1348,25 @@ function Calls() {
   );
 }
 
-const SEASONAL_OPTIONS: { value: Settings['seasonalThemeOverride']; label: string; emoji: string }[] =
-  [
-    { value: 'auto', label: 'Auto', emoji: '🗓' },
-    { value: 'off', label: 'Off', emoji: '×' },
-    { value: 'newyear', label: 'New Year', emoji: '🎆' },
-    { value: 'lunar', label: 'Lunar New Year', emoji: '🏮' },
-    { value: 'valentines', label: "Valentine's", emoji: '💖' },
-    { value: 'stpatricks', label: "St. Patrick's", emoji: '🍀' },
-    { value: 'aprilfools', label: 'April Fools', emoji: '?' },
-    { value: 'earthday', label: 'Earth Day', emoji: '🌱' },
-    { value: 'autumn', label: 'Autumn', emoji: '🍂' },
-    { value: 'halloween', label: 'Halloween', emoji: '🎃' },
-    { value: 'christmas', label: 'Christmas', emoji: '❄️' },
-    { value: 'arcade', label: 'Arcade Day', emoji: '👾' },
-    { value: 'deepspace', label: 'Deep Space', emoji: '🚀' },
-  ];
+const SEASONAL_OPTIONS: {
+  value: Settings['seasonalThemeOverride'];
+  label: string;
+  emoji: string;
+}[] = [
+  { value: 'auto', label: 'Auto', emoji: '🗓' },
+  { value: 'off', label: 'Off', emoji: '×' },
+  { value: 'newyear', label: 'New Year', emoji: '🎆' },
+  { value: 'lunar', label: 'Lunar New Year', emoji: '🏮' },
+  { value: 'valentines', label: "Valentine's", emoji: '💖' },
+  { value: 'stpatricks', label: "St. Patrick's", emoji: '🍀' },
+  { value: 'aprilfools', label: 'April Fools', emoji: '?' },
+  { value: 'earthday', label: 'Earth Day', emoji: '🌱' },
+  { value: 'autumn', label: 'Autumn', emoji: '🍂' },
+  { value: 'halloween', label: 'Halloween', emoji: '🎃' },
+  { value: 'christmas', label: 'Christmas', emoji: '❄️' },
+  { value: 'arcade', label: 'Arcade Day', emoji: '👾' },
+  { value: 'deepspace', label: 'Deep Space', emoji: '🚀' },
+];
 
 function SeasonalBgGrid({
   value,

src/app/hooks/useCallEmbed.ts

@@ -15,7 +15,7 @@ import { CallControlState } from '../plugins/call/CallControlState';
 import { useCallMembersChange, useCallSession } from './useCall';
 import { CallPreferences } from '../state/callPreferences';
 import { useSetting } from '../state/hooks/settings';
-import { settingsAtom } from '../state/settings';
+import { NoiseSuppressionMode, settingsAtom } from '../state/settings';
 import { unlockCallSounds } from '../utils/callSounds';
 
 const CallEmbedContext = createContext<CallEmbed | undefined>(undefined);
@@ -45,7 +45,7 @@ export const createCallEmbed = (
   themeKind: ElementCallThemeKind,
   container: HTMLElement,
   pref?: CallPreferences,
-  noiseSuppression = true,
+  denoiseMode: NoiseSuppressionMode = 'browser',
   forceAudioOff = false,
 ): CallEmbed => {
   const rtcSession = mx.matrixRTC.getRoomSession(room);
@@ -59,7 +59,7 @@ export const createCallEmbed = (
     room,
     intent,
     themeKind,
-    noiseSuppression,
+    denoiseMode,
     initialAudio,
     initialVideo,
   );
@@ -96,7 +96,7 @@ export const useCallStart = (dm = false) => {
         theme.kind,
         container,
         pref,
-        callNoiseSuppression ?? true,
+        callNoiseSuppression ?? 'browser',
         !!pttMode,
       );
 

src/app/plugins/call/CallEmbed.ts

@@ -18,6 +18,7 @@ import {
 } from 'matrix-widget-api';
 import { CallWidgetDriver } from './CallWidgetDriver';
 import { trimTrailingSlash } from '../../utils/common';
+import { NoiseSuppressionMode } from '../../state/settings';
 import {
   ElementCallIntent,
   ElementCallThemeKind,
@@ -100,7 +101,7 @@ export class CallEmbed {
     room: Room,
     intent: ElementCallIntent,
     themeKind: ElementCallThemeKind,
-    noiseSuppression = true,
+    denoiseMode: NoiseSuppressionMode = 'browser',
     initialAudio = true,
     initialVideo = false,
   ): Widget {
@@ -124,12 +125,21 @@ export class CallEmbed {
       perParticipantE2EE: room.hasEncryptionStateEvent().toString(),
       lang: 'en-EN',
       theme: themeKind,
-      noiseSuppression: noiseSuppression.toString(),
+      // EC's built-in WebRTC suppressor: on only for 'browser' tier. For 'ml' we
+      // disable it here so RNNoise (the Lotus denoise shim) owns suppression and
+      // the two don't fight each other.
+      noiseSuppression: (denoiseMode === 'browser').toString(),
       audio: initialAudio.toString(),
       video: initialVideo.toString(),
       header: 'none',
     });
 
+    if (denoiseMode === 'ml') {
+      // Signal the Lotus denoise shim (injected into the EC index.html) to route
+      // the mic through the RNNoise worklet before LiveKit publishes the track.
+      params.append('lotusDenoise', 'ml');
+    }
+
     if (CallEmbed.startingCall(intent)) {
       params.append('sendNotificationType', CallEmbed.dmCall(intent) ? 'ring' : 'notification');
     }

src/app/state/settings.ts

@@ -9,6 +9,11 @@ export type DateFormat =
   | 'YYYY-MM-DD'
   | '';
 export type MessageSpacing = '0' | '100' | '200' | '300' | '400' | '500';
+// Call mic noise suppression tier:
+//  - 'off'     : no suppression
+//  - 'browser' : WebRTC built-in suppression (Element Call noiseSuppression param)
+//  - 'ml'      : client-side RNNoise ML suppression (Lotus denoise shim)
+export type NoiseSuppressionMode = 'off' | 'browser' | 'ml';
 export type ChatBackground =
   | 'none'
   | 'blueprint'
@@ -109,7 +114,7 @@ export interface Settings {
   perMessageProfiles: boolean;
 
   cameraOnJoin: boolean;
-  callNoiseSuppression: boolean;
+  callNoiseSuppression: NoiseSuppressionMode;
   pttMode: boolean;
   pttKey: string;
 
@@ -199,7 +204,7 @@ const defaultSettings: Settings = {
   perMessageProfiles: false,
 
   cameraOnJoin: false,
-  callNoiseSuppression: true,
+  callNoiseSuppression: 'browser',
   pttMode: false,
   pttKey: 'Space',
 
@@ -235,6 +240,14 @@ export const getSettings = (): Settings => {
     return {
       ...defaultSettings,
       ...saved,
+      // Migrate legacy boolean callNoiseSuppression -> 3-way mode:
+      // true => browser-native, false => off. New string values pass through.
+      callNoiseSuppression:
+        typeof saved.callNoiseSuppression === 'boolean'
+          ? saved.callNoiseSuppression
+            ? 'browser'
+            : 'off'
+          : (saved.callNoiseSuppression ?? defaultSettings.callNoiseSuppression),
       composerToolbarButtons: {
         ...DEFAULT_COMPOSER_TOOLBAR,
         ...(saved.composerToolbarButtons ?? {}),

vite.config.js

@@ -65,6 +65,52 @@ function copyPdfWorker() {
   };
 }
 
+// Lotus ML noise suppression: ship the RNNoise worklet/wasm + our getUserMedia
+// shim alongside the vendored Element Call bundle, and inject the shim <script>
+// into EC's index.html so it runs before EC captures the mic. Runs after
+// viteStaticCopy has populated dist/public/element-call (closeBundle order).
+function lotusDenoise() {
+  return {
+    name: 'lotus-denoise',
+    closeBundle() {
+      const ecDir = path.resolve('dist/public/element-call');
+      if (!fs.existsSync(ecDir)) return;
+
+      const denoiseDir = path.join(ecDir, 'denoise');
+      fs.mkdirSync(denoiseDir, { recursive: true });
+
+      const sapphi = path.resolve('node_modules/@sapphi-red/web-noise-suppressor/dist');
+      const assets = [
+        [
+          path.join(sapphi, 'rnnoise/workletProcessor.js'),
+          path.join(denoiseDir, 'rnnoiseWorklet.js'),
+        ],
+        [path.join(sapphi, 'rnnoise.wasm'), path.join(denoiseDir, 'rnnoise.wasm')],
+        [path.join(sapphi, 'rnnoise_simd.wasm'), path.join(denoiseDir, 'rnnoise_simd.wasm')],
+      ];
+      assets.forEach(([s, d]) => {
+        if (fs.existsSync(s)) fs.copyFileSync(s, d);
+      });
+
+      const shimSrc = path.resolve('build/lotus-denoise.js');
+      if (fs.existsSync(shimSrc)) fs.copyFileSync(shimSrc, path.join(ecDir, 'lotus-denoise.js'));
+
+      const indexPath = path.join(ecDir, 'index.html');
+      if (fs.existsSync(indexPath)) {
+        let html = fs.readFileSync(indexPath, 'utf8');
+        if (!html.includes('lotus-denoise.js')) {
+          // Classic (non-deferred) script runs before EC's deferred module entry.
+          html = html.replace(
+            /<script type="module"/,
+            '<script src="./lotus-denoise.js"></script><script type="module"',
+          );
+          fs.writeFileSync(indexPath, html);
+        }
+      }
+    },
+  };
+}
+
 function serverMatrixSdkCryptoWasm(wasmFilePath) {
   return {
     name: 'vite-plugin-serve-matrix-sdk-crypto-wasm',
@@ -133,6 +179,7 @@ export default defineConfig({
     wasm(),
     react(),
     copyPdfWorker(),
+    lotusDenoise(),
     ...(process.env.SENTRY_AUTH_TOKEN
       ? [
           sentryVitePlugin({