promisify-patch

Will wrap node-style callback methods as a promise.

Browser: If you use this in the browser (via browserify), you should have an ES6-shim that includes a Promise implementation loaded before this library.

Installation

npm install promisify-patch

Promise implementation

This project does not install any promise implementation itself or as a dependency. If you are running an older version of node that does not implement promises, this module will attempt to load one of the following (in order). es6-promise, es6-promises, bluebird, Q.

In the browser (via browserify), no promise implementation will be loaded by this module. You should use an appropriate ES6 shim that provides a global Promise class/method.

Should you want to access the promise detection/use that this module uses, you can do so.

var Promise = require('promisify-patch').getPromiseImplementation();
if (typeof Promise !== 'function') throw new Error("No Promise implementation available.');
...
  return new Promise(function(resolve, reject){
    ...
  });

Usage

Single Use:

var promisify = require('promisify-patch');

promisify(fs.readdir, '/some/path')
    //.then
    //.catch
    ;

Patch Use

//only needs to be done once
require('promisify-patch').patch(); //adds itself as Function.prototype.promise

//somewhere ehlse
fs.readdir.promise('/some/path')
    //.then
    //.catch
    ;

//if you need to call a method bound against an object context
return context.foo.bind(context).promise(...);

NOTE: if you have a method that needs to be bound to a context object, you will need to explicitely bind it before .promise. (ex: return context.foo.bind(context).promise(...);)