promise.cb

transform an async function to callback style

Install

npm i promise.cb --save

API

const pcb = require('promise.cb');
const cbFn = pcb(asyncFn);

Example

const pcb = require('promise.cb');
 
async function fn1 (){
  return 1
}
 
const fn2 = require('co').wrap(function*(){
  return 2;
});
 
function fn3(){
  return Promise.resolve(3);
}
 
const _fn1 = pcb(fn1);
const _fn2 = pcb(fn2);
const _fn3 = pcb(fn3);
const cb = (err, res) => {
  assert(!err);
  console.log(res);
};
 
_fn1(cb); // log 1
_fn2(cb); // log 2
_fn3(cb); // log 3

Changelog

CHANGELOG.md

See Also

• promise.timeout
• promise.retry
• promise.map
• promise.ify
• promise.cb
• promise.obj
• promise.delay

Why

• callbackify looks good, but it's using asyncFn.length, so it's not working when using co.wrap
• catch(e => cb(e)) is not right, if cb(e) throws, it will only cause the promise reject, not throw error up

License

the MIT License http://magicdawn.mit-license.org