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+
+# thenify
+
+[![NPM version][npm-image]][npm-url]
+[![Build status][travis-image]][travis-url]
+[![Test coverage][coveralls-image]][coveralls-url]
+[![Dependency Status][david-image]][david-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+Promisify a callback-based function using [`any-promise`](https://github.com/kevinbeaty/any-promise).
+
+- Preserves function names
+- Uses a native promise implementation if available and tries to fall back to a promise implementation such as `bluebird`
+- Converts multiple arguments from the callback into an `Array`, also support change the behavior by `options.multiArgs`
+- Resulting function never deoptimizes
+- Supports both callback and promise style
+
+An added benefit is that `throw`n errors in that async function will be caught by the promise!
+
+## API
+
+### fn = thenify(fn, options)
+
+Promisifies a function.
+
+### Options
+
+`options` are optional.
+
+- `options.withCallback` - support both callback and promise style, default to `false`.
+- `options.multiArgs` - change the behavior when callback have multiple arguments. default to `true`.
+  - `true` - converts multiple arguments to an array
+  - `false`- always use the first argument
+  - `Array` - converts multiple arguments to an object with keys provided in `options.multiArgs`
+
+- Turn async functions into promises
+
+```js
+var thenify = require('thenify');
+
+var somethingAsync = thenify(function somethingAsync(a, b, c, callback) {
+  callback(null, a, b, c);
+});
+```
+
+- Backward compatible with callback
+
+```js
+var thenify = require('thenify');
+
+var somethingAsync = thenify(function somethingAsync(a, b, c, callback) {
+  callback(null, a, b, c);
+}, { withCallback: true });
+
+// somethingAsync(a, b, c).then(onFulfilled).catch(onRejected);
+// somethingAsync(a, b, c, function () {});
+```
+
+or use `thenify.withCallback()`
+
+```js
+var thenify = require('thenify').withCallback;
+
+var somethingAsync = thenify(function somethingAsync(a, b, c, callback) {
+  callback(null, a, b, c);
+});
+
+// somethingAsync(a, b, c).then(onFulfilled).catch(onRejected);
+// somethingAsync(a, b, c, function () {});
+```
+
+- Always return the first argument in callback
+
+```js
+var thenify = require('thenify');
+
+var promise = thenify(function (callback) {
+  callback(null, 1, 2, 3);
+}, { multiArgs: false });
+
+// promise().then(function onFulfilled(value) {
+//   assert.equal(value, 1);
+// });
+```
+
+- Converts callback arguments to an object
+
+```js
+var thenify = require('thenify');
+
+var promise = thenify(function (callback) {
+  callback(null, 1, 2, 3);
+}, { multiArgs: [ 'one', 'tow', 'three' ] });
+
+// promise().then(function onFulfilled(value) {
+//   assert.deepEqual(value, {
+//     one: 1,
+//     tow: 2,
+//     three: 3
+//   });
+// });
+```
+
+[gitter-image]: https://badges.gitter.im/thenables/thenify.png
+[gitter-url]: https://gitter.im/thenables/thenify
+[npm-image]: https://img.shields.io/npm/v/thenify.svg?style=flat-square
+[npm-url]: https://npmjs.org/package/thenify
+[github-tag]: http://img.shields.io/github/tag/thenables/thenify.svg?style=flat-square
+[github-url]: https://github.com/thenables/thenify/tags
+[travis-image]: https://img.shields.io/travis/thenables/thenify.svg?style=flat-square
+[travis-url]: https://travis-ci.org/thenables/thenify
+[coveralls-image]: https://img.shields.io/coveralls/thenables/thenify.svg?style=flat-square
+[coveralls-url]: https://coveralls.io/r/thenables/thenify
+[david-image]: http://img.shields.io/david/thenables/thenify.svg?style=flat-square
+[david-url]: https://david-dm.org/thenables/thenify
+[license-image]: http://img.shields.io/npm/l/thenify.svg?style=flat-square
+[license-url]: LICENSE
+[downloads-image]: http://img.shields.io/npm/dm/thenify.svg?style=flat-square
+[downloads-url]: https://npmjs.org/package/thenify