Load web workers in a way that Webpack 5 can bundle them

src/utils/createMatrixClient.ts

@@ -24,9 +24,6 @@ import {
     LocalStorageCryptoStore,
 } from "matrix-js-sdk/src/matrix";
 
-// @ts-ignore - `.ts` is needed here to make TS happy
-import IndexedDBWorker from "../workers/indexeddb.worker.ts";
-
 const localStorage = window.localStorage;
 
 // just *accessing* indexedDB throws an exception in firefox with
@@ -55,7 +52,7 @@ export default function createMatrixClient(opts: ICreateClientOpts): MatrixClien
             indexedDB: indexedDB,
             dbName: "riot-web-sync",
             localStorage,
-            workerFactory: () => new IndexedDBWorker(),
+            workerFactory: () => new Worker(new URL("../workers/indexeddb.worker.ts", import.meta.url)),
         });
     } else if (localStorage) {
         storeOpts.store = new MemoryStore({ localStorage });