38 lines
1.4 KiB
Markdown
38 lines
1.4 KiB
Markdown
## Any Promise
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[](http://travis-ci.org/kevinbeaty/any-promise)
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Let your library support any ES6 compatible Promise library or polyfill and leave the choice to the end user. The end user can install a polyfill or `npm install` their preference before using this library and the installed library will be automatically detected.
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Attempts to load libraries in the following order. The first successful `require` will be exported.
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- [es6-promise](https://github.com/jakearchibald/es6-promise)
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- [promise](https://github.com/then/promise)
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- [native-promise-only](https://github.com/getify/native-promise-only)
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- [bluebird](https://github.com/petkaantonov/bluebird)
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- [rsvp](https://github.com/tildeio/rsvp.js)
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- [when](https://github.com/cujojs/when)
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- [q](https://github.com/kriskowal/q)
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If no library is installed, attempts to export the global `Promise` (native or polyfill). The `browserify` version will always export the the global `Promise`, so polyfill as necessary.
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If you have multiple libraries installed (e.g. for testing), and would like to specify one you can use the `PROMISE_IMPL` env variable.
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```javascript
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var Promise = require('any-promise');
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return Promise
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.all([xf, f, init, coll])
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.then(fn);
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return new Promise(function(resolve, reject){
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try {
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resolve(item);
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} catch(e){
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reject(e);
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}
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});
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```
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