Open-source alternatives to When

A same behaviour EventTarget prototype, that can work with any object from JavaScript

Async is a JavaScript asynchronous flow library designed to manage the execution and coordination of asynchronous tasks in Node.js and the browser. It provides functional utilities to wrap, process, and orchestrate complex asynchronous workflows. The library distinguishes itself through a comprehensive task orchestrator that handles dependency graphs to resolve circular references and manages concurrent task queues. It includes a unification bridge that allows callback-style and promise-based functions to operate within the same execution interface. The project covers several primary capabil

An async control-flow library that makes stepping through logic easy.

This project is a PHP implementation of the Promises/A+ specification, providing a library for managing asynchronous operations and deferred values. It serves as an asynchronous task coordinator that allows for the creation of non-blocking code through a promise-based pattern. The library enables the simulation of asynchronous coroutines, allowing non-blocking code to be written in a linear style. It features duck-typed interoperability, which allows it to integrate with any foreign object that implements a then method regardless of class inheritance. The project covers broader capabilities

This project is a comprehensive technical guide and diagnostic manual for analyzing memory, performance, and asynchronous behavior within Node.js applications. It provides detailed methods for asynchronous tracing, memory diagnostics, and performance analysis to resolve runtime errors and execution bottlenecks. The resource distinguishes itself by covering advanced diagnostic workflows, including the use of flame graphs for CPU profiling, the capture and comparison of heap snapshots for memory leak detection, and the mapping of asynchronous call stacks. It also provides technical guidance on

This project is a comprehensive frontend interview preparation resource built around a question bank of over 1000 curated questions. It covers HTML, CSS, JavaScript, Vue, React, Node, TypeScript, Webpack, algorithms, and network security, with each question accompanied by a detailed answer explanation. The content is organized into a hierarchical category tree for browsable exploration, and a daily question rotation algorithm presents one question per day for systematic review. A client-side search index enables instant filtering of questions by title or tag, and the entire question bank is p

Turn a writable and readable stream into a streams2 duplex stream with support for async initialization and streams1/streams2 input

Transform stream that lets you peek the first line before deciding how to parse it

Combine an array of streams into a single duplex stream using pump and duplexify

a fast newline (or any delimiter) splitter stream - like require('split') but specific for binary data

Memoize promise-returning functions. Includes cache expire and prefetch.

Node-core streams for userland

RxJS is a library for reactive programming that provides a framework for composing asynchronous and event-based programs. It utilizes observable sequences to model data flows, allowing developers to manage complex sequences of events through a declarative programming interface. The library implements the observer pattern to facilitate decoupled communication between data producers and subscribers. By employing a lazy execution model, streams remain dormant until a consumer explicitly subscribes, at which point data production is triggered. This approach enables the construction of predictable

RSVP.js provides simple tools for organizing asynchronous code.

Sophisticated and functionally-minded async with advanced features: coroutines, promises, ES2015 iterables, fantasy-land.

High-level streams library for Node.js and the browser

A stream that emits multiple other streams one after another (streams3)

There are tons of Promise implementations out there, but all of them focus on browser compatibility and are often bloated with functionality.

A polyfill for native ES6 Promises as close as possible (no extensions) to the strict spec definitions.

Convenience wrapper for ReadableStream, with an API lifted from "from" and "through2"

Line-by-line Stream reader for node.js

Limit the execution rate of a function

Simple Node.JS stream (streams2) Transform that runs the transform functions concurrently (with a set max concurrency)

Delay a promise a specified amount of time

Transform the first chunk in a stream