It's a terrible language, but given its status as the de-facto language of the web, it has an incredible ecosystem of tools developed to help out.

Libraries

Functional Programming

Fantasyland
Specification for algebra in JavaScript

Folktale
A corresponding standard library

Staticland
Fantasyland but without classes

Tools

Typescript

functional programing for ts

3D

MatterJS

Rigid body physics engine

Phaser
2d game framework

ThreeJS

flexbox for react-three-fiber

UI Dev

https://github.com/davidkpiano/xstate :: state machines for the web

Meta

Acorn
js parser in js

EsLint config

Hardcore config functional config

Etc

ImmutableJS: Immutable data structures Ramda: Better JS functional programming Typescript with these two is the de factor pure programming ecosystem.

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CRDTs

an excellent resource on conflict-free replicated datatypes https://github.com/sweet-js/sweet-core https://github.com/atom/node-spellchecker

node

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