Emoji: Fix Web Worker import (#36603)

app/javascript/mastodon/features/emoji/index.ts

@@ -1,8 +1,9 @@
 import { initialState } from '@/mastodon/initial_state';
-import { loadWorker } from '@/mastodon/utils/workers';
 
 import { toSupportedLocale } from './locale';
 import { emojiLogger } from './utils';
+// eslint-disable-next-line import/default -- Importing via worker loader.
+import EmojiWorker from './worker?worker&inline';
 
 const userLocale = toSupportedLocale(initialState?.meta.locale ?? 'en');
 
@@ -16,9 +17,7 @@ export function initializeEmoji() {
   log('initializing emojis');
   if (!worker && 'Worker' in window) {
     try {
-      worker = loadWorker(new URL('./worker', import.meta.url), {
-        type: 'module',
-      });
+      worker = new EmojiWorker();
     } catch (err) {
       console.warn('Error creating web worker:', err);
     }

app/javascript/mastodon/polyfills/index.ts

@@ -2,9 +2,6 @@
 // If there are no polyfills, then this is just Promise.resolve() which means
 // it will execute in the same tick of the event loop (i.e. near-instant).
 
-// eslint-disable-next-line import/extensions -- This file is virtual so it thinks it has an extension
-import 'vite/modulepreload-polyfill';
-
 import { loadIntlPolyfills } from './intl';
 
 function importExtraPolyfills() {
@@ -17,6 +14,7 @@ export function loadPolyfills() {
   const needsExtraPolyfills = !window.requestIdleCallback;
 
   return Promise.all([
+    loadVitePreloadPolyfill(),
     loadIntlPolyfills(),
     // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition -- those properties might not exist in old browsers, even if they are always here in types
     needsExtraPolyfills ? importExtraPolyfills() : Promise.resolve(),
@@ -31,5 +29,13 @@ async function loadEmojiPolyfills() {
   }
 }
 
+// Loads Vite's module preload polyfill for older browsers, but not in a Worker context.
+function loadVitePreloadPolyfill() {
+  if (typeof document === 'undefined') return;
+  // @ts-expect-error -- This is a virtual module provided by Vite.
+  // eslint-disable-next-line import/extensions
+  return import('vite/modulepreload-polyfill');
+}
+
 // Null unless polyfill is needed.
 export let emojiRegexPolyfill: RegExp | null = null;