Method cb

apps/demo/src/plugin-demos/firebase-database.ts:62–71

(data, key)

		let on = true;
		const ref = this.database.ref('/issues/141');
		const cb = (data, key) => {
			if (!on) {
				throw new Error('issue 141 Listener: failed to unsubscribe');
			}
			console.log('issue141', data.val(), 'previous', key);
			ref.off('value', cb);
			on = false;

			ref.set({ name: 'Osei Fortune' });
		};
		ref.on('value', cb);
		ref.set({ name: 'Osei' });
	}