# p-timeout
> Timeout a promise after a specified amount of time
## Install
```
$ npm install p-timeout
```
## Usage
```js
const delay = require('delay');
const pTimeout = require('p-timeout');
const delayedPromise = delay(200);
pTimeout(delayedPromise, 50).then(() => 'foo');
//=> [TimeoutError: Promise timed out after 50 milliseconds]
```
## API
### pTimeout(input, milliseconds, message?, options?)
### pTimeout(input, milliseconds, fallback?, options?)
Returns a decorated `input` that times out after `milliseconds` time. It has a `.clear()` method that clears the timeout.
If you pass in a cancelable promise, specifically a promise with a `.cancel()` method, that method will be called when the `pTimeout` promise times out.
#### input
Type: `Promise`
Promise to decorate.
#### milliseconds
Type: `number`
Milliseconds before timing out.
Passing `Infinity` will cause it to never time out.
#### message
Type: `string | Error`\
Default: `'Promise timed out after 50 milliseconds'`
Specify a custom error message or error.
If you do a custom error, it's recommended to sub-class `pTimeout.TimeoutError`.
#### fallback
Type: `Function`
Do something other than rejecting with an error on timeout.
You could for example retry:
```js
const delay = require('delay');
const pTimeout = require('p-timeout');
const delayedPromise = () => delay(200);
pTimeout(delayedPromise(), 50, () => {
return pTimeout(delayedPromise(), 300);
});
```
#### options
Type: `object`
##### customTimers
Type: `object` with function properties `setTimeout` and `clearTimeout`
Custom implementations for the `setTimeout` and `clearTimeout` functions.
Useful for testing purposes, in particular to work around [`sinon.useFakeTimers()`](https://sinonjs.org/releases/latest/fake-timers/).
Example:
```js
const pTimeout = require('p-timeout');
const sinon = require('sinon');
(async () => {
const originalSetTimeout = setTimeout;
const originalClearTimeout = clearTimeout;
sinon.useFakeTimers();
// Use `pTimeout` without being affected by `sinon.useFakeTimers()`:
await pTimeout(doSomething(), 2000, undefined, {
customTimers: {
setTimeout: originalSetTimeout,
clearTimeout: originalClearTimeout
}
});
})();
```
### pTimeout.TimeoutError
Exposed for instance checking and sub-classing.
## Related
- [delay](https://github.com/sindresorhus/delay) - Delay a promise a specified amount of time
- [p-min-delay](https://github.com/sindresorhus/p-min-delay) - Delay a promise a minimum amount of time
- [p-retry](https://github.com/sindresorhus/p-retry) - Retry a promise-returning function
- [More…](https://github.com/sindresorhus/promise-fun)
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