import delay from '@gradecam/delay';

delay(200)
	.then(() => {
		// Executed after 200 milliseconds
	});

delay(100, 'a result')
	.then(result => {
		// Executed after 100 milliseconds
		// result === 'a result';
	});

import * as assert from 'assert';
import { delay } from '@gradecam/delay';

// With Node.js >=7.6 and async functions
(async () => {
	bar();

	await delay.resolve(100);

	// Executed 100 milliseconds later
	baz();
})();

// There's also `delay.reject()` which optionally accepts a value and rejects it `ms` later
delay.reject(100, 'foo'))
	.then(x => blah()) // Never executed
	.catch(err => {
		// Executed 100 milliseconds later
		// err === 'foo'
	});

// You can clear the delay by calling `.clear` on the returned promise
(async () => {
	const delayedPromise = delay.resolve(1000);
	setTimeout(() => {
		delayedPromise.clear();
	}, 500);
	await delayedPromise;
})();

// If you want to cancel (reject) the promise then call `.clear` with an argument other than `undefined`.
(async () => {
	const delayedPromise = delay.resolve(1000, 'Successfully delayed.');
	setTimeout(() => {
		delayedPromise.clear(new Error('cancelled'));
	});
	try {
		await delayedPromise;
		assert.fail('should have rejected the promise.');
	} catch (err) {
		assert.equal(err.message, 'cancelled');
	}
})();