@wwdrew/expo-spotify-sdk/build/internal/sync-external-store.js

Expo module wrapping the native Spotify iOS (v5) and Android (v4) SDKs for OAuth authentication and App Remote playback control

/**
 * Module-level store backing `useSyncExternalStore` hooks. Initialises lazily on
 * first subscription and notifies subscribers when `update` changes the snapshot.
 */
export function createSyncExternalStore(initialState, init) {
    let state = initialState;
    const listeners = new Set();
    let initialised = false;
    const store = {
        getState: () => state,
        getSnapshot: () => state,
        update(next) {
            const resolved = typeof next === "function" ? next(state) : next;
            if (Object.is(resolved, state))
                return;
            state = resolved;
            listeners.forEach((listener) => listener());
        },
        subscribe(listener) {
            if (!initialised) {
                initialised = true;
                try {
                    init(store);
                }
                catch (error) {
                    initialised = false;
                    throw error;
                }
            }
            listeners.add(listener);
            return () => listeners.delete(listener);
        },
    };
    return store;
}
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