Function devtools

src/middleware.test.ts:58–74

(api)

		}));

		const devtools: StoreMiddleware<number> = (api) => {
			const connection = connectSpy();
			return {
				init: () => {
					connection.init(api.get());
					return connection.subscribe((message: DevtoolsMessage) => {
						if (message.state != null) {
							api.set(Number(message.state));
						}
					});
				},
				set: (next) => (setter) => {
					next(setter);
					connection.send({ type: "set" }, api.get());
				},
			};
		};

		const countStore = store(0, { middleware: [devtools] });