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  • License MIT

Delay a promise a specified amount of time

Package Exports

  • delay

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (delay) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

delay Build Status

Delay a promise a specified amount of time

Install

$ npm install delay

Usage

const delay = require('delay');

(async () => {
    bar();

    await delay(100);

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

API

delay(milliseconds, [options])

Create a promise which resolves after the specified milliseconds.

delay.reject(milliseconds, [options])

Create a promise which rejects after the specified milliseconds.

milliseconds

Type: number

Milliseconds to delay the promise.

options

Type: Object

value

Type: any

Optional value to resolve or reject in the returned promise.

signal

Type: AbortSignal

The returned promise will be rejected with an AbortError if the signal is aborted. AbortSignal is available in all modern browsers and there is a ponyfill for Node.js.

delayPromise.clear()

Clears the delay and settles the promise.

Advanced usage

Passing a value:

const delay = require('delay');

(async() => {
    const result = await delay(100, {value: '🦄'});

    // Executed after 100 milliseconds
    console.log(result);
    //=> '🦄'
})();

Using delay.reject(), which optionally accepts a value and rejects it ms later:

const delay = require('delay');

(async () => {
    try {
        await delay.reject(100, {value: new Error('🦄')});

        console.log('This is never executed');
    } catch (error) {
        // 100 milliseconds later
        console.log(error);
        //=> [Error: 🦄]
    }
})();

You can settle the delay early by calling .clear():

const delay = require('delay');

(async () => {
    const delayedPromise = delay(1000, {value: 'Done'});

    setTimeout(() => {
        delayedPromise.clear();
    }, 500);

    // 500 milliseconds later
    console.log(await delayedPromise);
    //=> 'Done'
})();

You can abort the delay with an AbortSignal:

const delay = require('delay');

(async () => {
    const abortController = new AbortController();

    setTimeout(() => {
        abortController.abort();
    }, 500);

    try {
        await delay(1000, {signal: abortController.signal});
    } catch (error) {
        // 500 milliseconds later
        console.log(error.name)
        //=> 'AbortError'
    }
})();
  • delay-cli - CLI for this module
  • p-cancelable - Create a promise that can be canceled
  • p-min-delay - Delay a promise a minimum amount of time
  • p-immediate - Returns a promise resolved in the next event loop - think setImmediate()
  • p-timeout - Timeout a promise after a specified amount of time
  • More…

License

MIT © Sindre Sorhus