src/vs/workbench/services/storage/browser/storageService.ts/IndexedDBStorageDatabase/registerListeners
class IndexedDBStorageDatabase:	private registerListeners(): void {

		// Check for storage change events from other
		// windows/tabs via `BroadcastChannel` mechanisms.
		if (this.broadcastChannel) {
			this._register(this.broadcastChannel.onDidReceiveData(data => {
				if (isStorageItemsChangeEvent(data)) {
					this._onDidChangeItemsExternal.fire(data);
				}
			}));
		}
	}