Civet language: compact, TypeScript superset

resembling Python and F# (terse, powerful, functional language),
compiles to JavaScript

Homepage | Civet

A Programming Language for the New Millennium
Code More with Less in a TypeScript Superset

Civet is a programming language that compiles to TypeScript or JavaScript, so you can use existing tooling (including VSCode type checking, hints, completion, etc.) while enabling concise and powerful syntax. 

It starts with 99% JS/TS compatibility, making it easy to transition existing code bases. Then it adds many features and syntactic sugar, with some highlights below and more comprehensive examples in the reference. 

See also Civet's design philosophy and changelog

DanielXMoore/Civet: A TypeScript superset that favors more types and less typing @GitHub

JavaScript Weekly Issue 716: December 12, 2024

Two years old and well maintained, Civet offers an interesting approach. Think JavaScript but with Python style indentation, chained comparisons, built-in JSX, & more. 

This example alone shows off the potential for tighter, easier-to-write code.