- q
A library for promises (CommonJS/Promises/A,B,D)
- async
Higher-order functions and common patterns for asynchronous code
- winston
A logger for just about everything.
- mkdirp
Recursively mkdir, like `mkdir -p`
- node-fetch
A light-weight module that brings window.fetch to node.js
- bluebird
Full featured Promises/A+ implementation with exceptionally good performance
- ws
Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js
- mocha
simple, flexible, fun test framework
- readable-stream
Streams3, a user-land copy of the stream library from Node.js
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