Callback Packages

Promisify a callback-style function

Higher-order functions and common patterns for asynchronous code

pipe streams together and close all of them if one of them closes

Make a callback- or promise-based function support both promises and callbacks.

Call a callback when a readable/writable/duplex stream has completed or failed.

Compare items in two sequences to find a longest common subsequence

Run an array of functions in parallel

Let your JS API users either give you a callback or receive a promise

Throw a given error

Watch globs and execute a function upon change, with intelligent defaults for debouncing and queueing.

Run an array of functions in series

Read all stream content and pass it to callback

Wait for multiple callback

Run an array of functions in parallel, but limit the number of tasks executing at the same time

Library to help write libraries that accept both promises and callbacks.

Promisify a function call so users can call a function with a callback or get a promise

Extract the options and callback from a function's arguments easily

A pipeable stream that calls your callback

Bundle results of async functions calls into one callback with all the results

Tiny, dependency free promisify library.