const f1 = x => x + 1;
const f2 = x => x - 1;

const configureStorage = async ({ navigator, err }) => {
	const persistent = await navigator.storage?.persist?.();

	if (persistent === undefined) {
		err(`Persistent storage is not supported.`);
		return;
	}

	if (!persistent) {
		err(`Persistent storage is not enabled.`);
		return;
	}
};

const registerServiceWorker = async ({ serviceWorkerPath, navigator, err }) => {
	// FIXME: add explanation for permission before requesting it.
	try {
		await navigator.serviceWorker?.register(serviceWorkerPath)
	} catch (e) {
		err(`Service worker registration failed: ${e}`);
	}
};



export const main = async ({
	serviceWorkerPath = "./service-worker.js",
	mknavigator       = () => navigator,
	out               = console.log,
	err               = console.warn,
} = {}) => {
	const env = {
		serviceWorkerPath,
		out,
		err,
		navigator: mknavigator(),
	};
	await registerServiceWorker(env);
};