Top 9 JavaScript Flavours

1. TypeScript

TypeScript is a strongly typed programming language that builds on JavaScript, giving you better tooling at any scale.

https://www.typescriptlang.org/

2. Reason

Reason lets you write simple, fast and quality type safe code while leveraging both the JavaScript & OCaml ecosystems.

https://reasonml.github.io/

3. Flow

FLOW IS A STATIC TYPE CHECKER FOR JAVASCRIPT.
https://flow.org/

4. Elm

Elm uses type inference to detect corner cases and give friendly hints. ... benchmarks show that this helps us generate particularly fast JavaScript code.

https://elm-lang.org/

5. ClojureScript

Clojure is a dynamic, general-purpose programming language supporting interactive development. Clojure is a functional programming language featuring a rich set of immutable, persistent data structures. As a dialect of Lisp, it has a code-as-data philosophy and a powerful macro system.

https://clojurescript.org/

6. PureScript

A strongly-typed functional programming language that compiles to JavaScript

https://www.purescript.org/

7. CoffeeScript

CoffeeScript is a little language that compiles into JavaScript. Underneath that awkward Java-esque patina, JavaScript has always had a gorgeous heart.

https://coffeescript.org/

8. ReScript

ReScript is a robustly typed language that compiles to efficient and human-readable JavaScript.
https://rescript-lang.org/

9. Imba

Imba is a Web programming language that's fast in two ways: Imba's time-saving syntax with built-in tags and styles results in less typing and switching files so you can build things fast.
https://imba.io/

Which one is your favorite ?