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90 lines
1.9 KiB
Markdown
90 lines
1.9 KiB
Markdown
# p-timeout [](https://travis-ci.org/sindresorhus/p-timeout)
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> Timeout a promise after a specified amount of time
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## Install
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```
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$ npm install p-timeout
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```
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## Usage
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```js
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const delay = require('delay');
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const pTimeout = require('p-timeout');
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const delayedPromise = delay(200);
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pTimeout(delayedPromise, 50).then(() => 'foo');
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//=> [TimeoutError: Promise timed out after 50 milliseconds]
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```
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## API
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### pTimeout(input, ms, [message | fallback])
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Returns a decorated `input` that times out after `ms` time.
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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.
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#### input
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Type: `Promise`
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Promise to decorate.
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#### ms
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Type: `number`
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Milliseconds before timing out.
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#### message
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Type: `string` `Error`<br>
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Default: `'Promise timed out after 50 milliseconds'`
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Specify a custom error message or error.
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If you do a custom error, it's recommended to sub-class `pTimeout.TimeoutError`.
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#### fallback
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Type: `Function`
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Do something other than rejecting with an error on timeout.
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You could for example retry:
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```js
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const delay = require('delay');
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const pTimeout = require('p-timeout');
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const delayedPromise = () => delay(200);
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pTimeout(delayedPromise(), 50, () => {
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return pTimeout(delayedPromise(), 300);
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});
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```
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### pTimeout.TimeoutError
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Exposed for instance checking and sub-classing.
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## Related
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- [delay](https://github.com/sindresorhus/delay) - Delay a promise a specified amount of time
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- [p-min-delay](https://github.com/sindresorhus/p-min-delay) - Delay a promise a minimum amount of time
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- [p-retry](https://github.com/sindresorhus/p-retry) - Retry a promise-returning function
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- [More…](https://github.com/sindresorhus/promise-fun)
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## License
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MIT © [Sindre Sorhus](https://sindresorhus.com)
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