fix(app): load on browsers without AbortSignal.any (#3439)

fluxer_app/src/app/AbortSignalPolyfill.ts

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+function abortSignalTimeout(milliseconds: number): AbortSignal {
+	const controller = new AbortController();
+	setTimeout(() => controller.abort(new DOMException('The operation timed out.', 'TimeoutError')), milliseconds);
+	return controller.signal;
+}
+
+function abortSignalAny(signals: Iterable<AbortSignal>): AbortSignal {
+	const controller = new AbortController();
+	const sources = [...signals];
+	const aborted = sources.find((source) => source.aborted);
+	if (aborted) {
+		controller.abort(aborted.reason);
+		return controller.signal;
+	}
+	for (const source of sources) {
+		source.addEventListener('abort', () => controller.abort(source.reason), {once: true, signal: controller.signal});
+	}
+	return controller.signal;
+}
+
+export function installAbortSignalPolyfill(target: typeof AbortSignal = AbortSignal): void {
+	if (typeof target.timeout !== 'function') {
+		target.timeout = abortSignalTimeout;
+	}
+	if (typeof target.any !== 'function') {
+		target.any = abortSignalAny;
+	}
+}
+
+installAbortSignalPolyfill();

fluxer_app/src/index.tsx

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
+import '@app/app/AbortSignalPolyfill';
 import '@app/app/BootShell.css';
 import {startAppStorage} from '@app/features/platform/state/AppStorageBootstrap';
 import {installBrowserStorageAccessProtection} from '@app/features/platform/state/ProtectedWebStorage';