const delay = require('delay');

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

somePromise()
    .then(delay(100))
    .then(result => {
        // Executed 100 milliseconds after somePromise resolves
        // The result from somePromise is passed through
    });

const delay = require('delay');

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

    await delay(100);

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

// There's also `delay.reject()` that takes the value, and rejects it `ms` later
Promise.resolve('foo')
    .then(delay.reject(100))
    .then(x => blah()) // Never executed
    .catch(err => {
        // Executed 100 milliseconds later
        // err === 'foo'
    });

// You can also specify the rejection value
Promise.resolve('foo')
    .then(delay.reject(100, 'bar'))
    .then(x => blah()) // Never executed
    .catch(err => {
        // executed 100 milliseconds later
        // err === 'bar'
    });

// You can cancel the promise by calling `.cancel()`
async () => {
    const delaying = delay(1000);
    setTimeout(() => {
        delaying.cancel();
    }, 500);
    try {
        await delaying;
    } catch (err) {
        // `err` is an instance of `delay.CancelError`
    }
}();