Promises and async control flow

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• koa-convertconvert modern Koa legacy generator-based middleware to promise-based middleware
• a-sync-waterfallRuns a list of async tasks, passing the results of each into the next one
• is-observableCheck if a value is an Observable
• promise-breakerLibrary to help write libraries that accept both promises and callbacks.
• async-hook-jlInspect the life of handle objects in node
• plimit-litThis package is a helper to run multiple promise-returning & async functions with limited concurrency.
• p-pipeCompose promise-returning & async functions into a reusable pipeline
• now-and-laterMap over an array or object of values in parallel or series, passing each through the async iterator, with optional lifecycle hooks.
• retry-as-promisedRetry a failed promise
• any-observableSupport any Observable library and polyfill
• p-wait-forWait for a condition to be true
• p-map-seriesMap over promises serially
• await-to-jsAsync/await wrapper for easy error handling in js
• asyncboxA collection of small async/await utilities
• isomorphic-timers-promises`timers/promises` for client and server.
• exec-asyncReturns a promise with the results of a shell command
• abort-controller-xAbortable async function helpers
• async-validatorvalidate form asynchronous
• async-doneAllows libraries to handle various caller provided asynchronous functions uniformly. Maps promises, observables, child processes and streams, and callbacks to callback style.
• chai-as-promisedExtends Chai with assertions about promises.
• p-waterfallRun promise-returning & async functions in series, each passing its result to the next
• async-foreachAn optionally-asynchronous forEach with an interesting interface.
• whenA lightweight Promises/A+ and when() implementation, plus other async goodies.
• bachCompose your async functions with elegance.
• extrareqp2Promise based HTTP client for the browser and node.js
• @jpwilliams/waitgroupA tiny version of Golang's WaitGroup with typings, promises, and zero dependencies.
• async-settleSettle an async function.
• @vladfrangu/async_event_emitterAn event emitter implementation with async support in mind
• replace-in-fileA simple utility to quickly replace text in one or more files.
• scrypt-jsThe scrypt password-based key derivation function with sync and cancellable async.
• debounce-promiseCreate a debounced version of a promise returning function
• p-allRun promise-returning & async functions concurrently with optional limited concurrency
• await-lockMutex locks for async functions
• traverse-chainA simple asynchronous tool
• micro-ftchWrappers for built-in fetch() enabling killswitch, logging, concurrency limit and other features
• @ioredis/as-callbackA performant and standard (Bluebird) library that registers a node-style callback on a promise
• @nevware21/ts-asyncsupport for asynchronous development with a Promise based task Scheduler, several different Promise implementations (synchronous, idle, asynchronous and native runtime wrappers), await helpers, and aliases all built and tested using TypeScript.
• foreachasyncA node- and browser-ready async (now with promises) counterpart of Array.prototype.forEach
• promise.seriesRun Promise in series.
• asynciterator.prototype`AsyncIterator.prototype`, or a shared object to use.
• combine-promises[](https://www.npmjs.com/package/combine-promises) [](https://github.com/slorber/combine-promises/actions/work
• p-memoizeMemoize promise-returning & async functions
• p-someWait for a specified number of promises to be fulfilled
• p-anyWait for any promise to be fulfilled
• @redux-saga/delay-pPromisified setTimeout
• @redux-saga/deferredHelper for creating "exposed" promise object (with resolve & reject methods).
• request-promiseThe simplified HTTP request client 'request' with Promise support. Powered by Bluebird.
• @lifeomic/attemptLibrary that can be used to retry functions that return promise
• set-interval-asyncModern version of setInterval for promises and async functions available in Node.js and browsers.
• opossumA fail-fast circuit breaker for promises and callbacks

• node-fetch vs axios
• async vs neo-async
• emittery vs basic-ftp