race-signal

Race a promise against an AbortSignal

About

Pass a promise and an abort signal and await the result.

Example - Basic usage

import { raceSignal } from 'race-signal'

const controller = new AbortController()

const promise = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve('a value')
  }, 1000)
})

setTimeout(() => {
  controller.abort()
}, 500)

// throws an AbortError
const resolve = await raceSignal(promise, controller.signal)

Example - Overriding errors

By default the thrown error is the .reason property of the signal but it's possible to override this behaviour with the translateError option:

import { raceSignal } from 'race-signal'

const controller = new AbortController()

const promise = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve('a value')
  }, 1000)
})

setTimeout(() => {
  controller.abort()
}, 500)

// throws `Error('Oh no!')`
const resolve = await raceSignal(promise, controller.signal, {
  translateError: (signal) => {
    // use `signal`, or don't
    return new Error('Oh no!')
  }
})

Install

$ npm i race-signal

Browser <script> tag

Loading this module through a script tag will make its exports available as RaceSignal in the global namespace.

<script src="https://unpkg.com/race-signal/dist/index.min.js"></script>

API Docs

• https://achingbrain.github.io/race-signal

License

Licensed under either of

• Apache 2.0, (LICENSE-APACHE / http://www.apache.org/licenses/LICENSE-2.0)
• MIT (LICENSE-MIT / http://opensource.org/licenses/MIT)

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.