Promisify a callback-based function
JavaScript

README.md

thenify

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Promisify a callback-based function using 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
  • Resulting function never deoptimizes
  • Supports both callback and promise style

An added benefit is that thrown errors in that async function will be caught by the promise!

API

  • Turn async functions into promises
var thenify = require('thenify');

var somethingAsync = thenify(function somethingAsync(a, b, c, callback) {
  callback(null, a, b, c);
});
  • Backward compatible with callback
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 () {});

var fn = thenify(fn)

Promisifies a function.