make-callback

Make synchronous function or generator to support callback api

Install

npm i make-callback --save
npm test

Usage

For more use-cases see the tests

var makeCallback = require('make-callback')
var JSONParseAsync = makeCallback(JSON.parse)
 
JSONParseAsync('{"foo":"bar"}', function (err, json) {
  if (err) {
    return console.error(err)
  }
 
  console.log(json)
  //=> {foo: 'bar'}
})

You also can make generator that return and yield anything (string, array, object, function, thunk, promise or etc) to support callback api

var fs = require('mz/fs')
var makeCallback = require('make-callback')
 
function * gen (val) {
  var a = yield 'a'
  var b = yield {b: 'b'}
  var c = yield ['c', 'f']
  var d = yield 123
  var e = yield fs.readFile('./package.json')
  return [a, b, c, d, e, val || 'foobar']
}
 
var genCallback = makeCallback(gen)
genCallback(function (err, res) {
  if (err) {
    return console.error(err)
  }
 
  console.log(res)
  //=> ['a', {b: 'b'}, ['c', 'f'], 123, 'content of package.json',  'foobar']
  console.log(res.length)
  //=> 6
})

See aslo

• manage-arguments: Prevents arguments leakage - managing arguments. From Optimization killers by Petka Antonov.
• handle-arguments: Handles given Arguments object - return separatly last argument (commonly callback) and other arguments as Array. Useful in node-style callback flow.
• handle-callback: Make promise to have support for callback api, it returns promise in that same time.
• always-callback: Create callback api for given sync function. Guarantee that given function (sync or async, no matter) will always have callback api and will handle errors correctly.
• always-thunk: Create thunk from async or sync function. Works like thunkify.
• always-promise: Create Bluebird Promise from given async or synchronous function. It automatically convert sync functions to async, then to promise.
• is-es6-generator: Check that given value is Generator

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.

Charlike Make Reagent