DefinitelyTyped/types/schedule/schedule-tests.ts

import { unstable_scheduleWork, unstable_cancelScheduledWork, unstable_now } from 'schedule';

// $ExpectType CallbackNode
const callbackNode = unstable_scheduleWork(() => 0, { timeout: 100 });
unstable_cancelScheduledWork(callbackNode);

// $ExpectType number
unstable_now();