promise-resolver

promise-resolver

Turn a promises resolver methods into a node style callback

Install

$ npm install --save promise-resolver

Usage

var promiseResolver = require('promise-resolver');

new Promise(function (resolve, reject) {
  var cb = promiseResolver(resolve, reject, passThroughCallback);
  
  cb(new Error('...')); // rejects promise and calls passThroughCallback with same args
  cb(null, 'result'); // resolves promise and calls passThroughCallback with same args
});

API

promiseResolver(resolve, reject, passThrough)

All arguments should be functions, null, or undefined.

• resolve - promise resolve function
• reject - promise reject function
• passThrough - a "pass through" node style (error first) callback.

Returns a node style callback: cb(err, result...)

Calling the callback will resolve or reject the promise (depending on the err argument). If it exists, the passThrough callback will be called with the same arguments.

promiseResolver.defer(passThrough, Promise)

• passThrough - a "pass through" node style callback as described above
• Promise - an alternate Promise constructor (will use global.Promise by default).

The return value is a standard defer object with an additional cb property that is a node style resolver callback.

var defer = promiseResolver(passThroughCallback);
var cb = defer.cb;
  
cb(new Error('...')); // rejects promise and calls passThroughCallback with same args
cb(null, 'result'); // resolves promise and calls passThroughCallback with same args

return defer.promise;

defer.resolve, and defer.reject are also available on the defer object.

License

MIT © James Talmage