snapshot of https://github.com/RocketChat/Rocket.Chat.git (develop, 2026-09-16; blobs > 131072B omitted)

packages/ui-voip/src/context/usePeekMediaSessionFeatures.ts

@@ -0,0 +1,51 @@
+import type { CallFeature } from '@rocket.chat/media-signaling';
+import { useCallback, useRef, useSyncExternalStore } from 'react';
+
+import { useMediaCallInstance } from './MediaCallInstanceContext';
+
+export type PeekMediaSessionFeaturesReturn = readonly CallFeature[];
+
+const areEqual = (a: PeekMediaSessionFeaturesReturn, b: PeekMediaSessionFeaturesReturn) => {
+	if (a.length !== b.length) {
+		return false;
+	}
+	return a.every((feature) => b.includes(feature));
+};
+
+const emptyFeatures: PeekMediaSessionFeaturesReturn = [];
+
+export const usePeekMediaSessionFeatures = (): PeekMediaSessionFeaturesReturn => {
+	const { instance } = useMediaCallInstance();
+	const cache = useRef<PeekMediaSessionFeaturesReturn>([]);
+
+	const subscribe = useCallback(
+		(onStoreChange: () => void): (() => void) => {
+			if (!instance) {
+				return () => undefined;
+			}
+			return instance?.on('sessionStateChange', onStoreChange);
+		},
+		[instance],
+	);
+
+	const getSnapshot = useCallback(() => {
+		if (!instance) {
+			return emptyFeatures;
+		}
+
+		const instanceState = instance.getState();
+		if (!instanceState?.confirmed) {
+			return emptyFeatures;
+		}
+
+		const { features } = instanceState;
+
+		if (!cache.current || !areEqual(features, cache.current)) {
+			cache.current = features;
+			return features;
+		}
+		return cache.current;
+	}, [instance]);
+
+	return useSyncExternalStore(subscribe, getSnapshot);
+};