97 lines
3.0 KiB
Markdown
97 lines
3.0 KiB
Markdown
<p align="center">
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<a href="http://gulpjs.com">
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<img height="257" width="114" src="https://raw.githubusercontent.com/gulpjs/artwork/master/gulp-2x.png">
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</a>
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</p>
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# async-settle
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[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![AppVeyor Build Status][appveyor-image]][appveyor-url] [![Coveralls Status][coveralls-image]][coveralls-url] [![Gitter chat][gitter-image]][gitter-url]
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Settle an async function. It will always complete successfully with an object of the resulting state.
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Handles completion and errors for callbacks, promises, observables and streams.
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Will run call the function on `nextTick`. This will cause all functions to be async.
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## Usage
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### Successful completion
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```js
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var asyncSettle = require('async-settle');
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asyncSettle(function(done){
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// do async things
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done(null, 2);
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}, function(error, result){
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// `error` will ALWAYS be null on execution of the first function.
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// `result` will ALWAYS be a settled object with the result or error of the first function.
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});
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```
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### Failed completion
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```js
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var asyncSettle = require('async-settle');
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asyncSettle(function(done){
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// do async things
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done(new Error('Some Error Occurred'));
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}, function(error, result){
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// `error` will ALWAYS be null on execution of the first function.
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// `result` will ALWAYS be a settled object with the result or error of the first function.
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});
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```
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## API
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### `asyncSettle(fn, callback)`
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Takes a function to execute (`fn`) and a function to call on completion (`callback`).
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#### `fn([done])`
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Optionally takes a callback (`done`) to call when async tasks are complete.
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Executed in the context of [`async-done`][async-done], with all errors and results being settled.
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Completion is handled by [`async-done` completion and error resolution][completions].
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#### `callback(error, result)`
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Called on completion of `fn` and recieves a settled object as the `result` argument.
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The `error` argument will always be `null`.
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#### Settled Object
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Settled values have two properties, `state` and `value`.
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`state` has two possible options `'error'` and `'success'`.
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`value` will be the value passed to original callback.
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## License
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MIT
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[async-done]: https://github.com/gulpjs/async-done
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[completions]: https://github.com/gulpjs/async-done#completion-and-error-resolution
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[downloads-image]: http://img.shields.io/npm/dm/async-settle.svg
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[npm-url]: https://www.npmjs.com/package/async-settle
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[npm-image]: http://img.shields.io/npm/v/async-settle.svg
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[travis-url]: https://travis-ci.org/gulpjs/async-settle
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[travis-image]: http://img.shields.io/travis/gulpjs/async-settle.svg?label=travis-ci
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[appveyor-url]: https://ci.appveyor.com/project/gulpjs/async-settle
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[appveyor-image]: https://img.shields.io/appveyor/ci/gulpjs/async-settle.svg?label=appveyor
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[coveralls-url]: https://coveralls.io/r/gulpjs/async-settle
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[coveralls-image]: http://img.shields.io/coveralls/gulpjs/async-settle/master.svg
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[gitter-url]: https://gitter.im/gulpjs/gulp
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[gitter-image]: https://badges.gitter.im/gulpjs/gulp.svg
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