Load the Intl.Segmenter polyfill only if needed

package.json

@@ -118,5 +118,6 @@
   },
   "resolutions": {
     "strip-ansi": "6.0.1"
-  }
+  },
+  "packageManager": "yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"
 }

src/initializer.tsx

@@ -11,6 +11,7 @@ import LanguageDetector from "i18next-browser-languagedetector";
 import Backend from "i18next-http-backend";
 import * as Sentry from "@sentry/react";
 import { logger } from "matrix-js-sdk/src/logger";
+import { shouldPolyfill as shouldPolyfillSegmenter } from "@formatjs/intl-segmenter/should-polyfill";
 
 import { getUrlParams } from "./UrlParams";
 import { Config } from "./config/Config";
@@ -41,10 +42,10 @@ export class Initializer {
     return Initializer.internalInstance?.isInitialized;
   }
 
-  public static initBeforeReact(): void {
-    // this maybe also needs to return a promise in the future,
-    // if we have to do async inits before showing the loading screen
-    // but this should be avoided if possible
+  public static async initBeforeReact(): Promise<void> {
+    if (shouldPolyfillSegmenter()) {
+      await import("@formatjs/intl-segmenter/polyfill-force");
+    }
 
     //i18n
     const languageDetector = new LanguageDetector();
@@ -54,7 +55,7 @@ export class Initializer {
       lookup: () => getUrlParams().lang ?? undefined,
     });
 
-    i18n
+    await i18n
       .use(Backend)
       .use(languageDetector)
       .use(initReactI18next)
@@ -74,9 +75,6 @@ export class Initializer {
           order: ["urlFragment", "navigator"],
           caches: [],
         },
-      })
-      .catch((e) => {
-        logger.error("Failed to initialize i18n", e);
       });
 
     // Custom Themeing

src/main.tsx

@@ -20,7 +20,6 @@ import {
   setLogExtension as setLKLogExtension,
   setLogLevel as setLKLogLevel,
 } from "livekit-client";
-import "@formatjs/intl-segmenter/polyfill";
 import "@formatjs/intl-durationformat/polyfill";
 
 import { App } from "./App";
@@ -57,12 +56,17 @@ if (fatalError !== null) {
   throw fatalError; // Stop the app early
 }
 
-Initializer.initBeforeReact();
+Initializer.initBeforeReact()
+  .then(() => {
+    const history = createBrowserHistory();
 
-const history = createBrowserHistory();
-
-root.render(
-  <StrictMode>
-    <App history={history} />
-  </StrictMode>,
-);
+    root.render(
+      <StrictMode>
+        <App history={history} />
+      </StrictMode>,
+    );
+  })
+  .catch((e) => {
+    logger.error("Failed to initialize app", e);
+    root.render(e.message);
+  });