prmzfy

Promisify for nodebacks. Requires Promise to be supported by runtime or via polyfill.

Installation

$ npm i prmzfy

Usage

const prmzfy = require('prmzfy');

const readFile = prmzfy(fs.readFile);

readFile('file.txt')
    .then(data => ...)
    .catch(error => ...);

Promisifying callback with multiple arguments:

const prmzfy = require('prmzfy');

const sumAndProd = (a, b, cb) => {
    cb(null, a + b, a * b);
};

const sp = prmzfy(sumAndProd, { multiArgs: true });

sp(3, 4)
    .then(([sum, prod]) => console.log(sum, prod));

Don't forget to bind proper context when promisifying prototype methods:

const prmzfy = require('prmzfy');

const foo = new Foo();

const bar = prmzfy(foo.someMethod.bind(foo)); 

Typescript

This module also contains type declarations.

import * as prmzfy from 'prmzfy';