What the repository is called, and the language the tool accepts as input.
What GitHub reports the repository is written in today. This is the column most people scroll past, and here it is the surprising one.
What the description says comes out the other end: clean JavaScript output.
The one-line description has not changed in years: a superset of JavaScript that compiles to clean JavaScript output. The language badge is what moved. A compiler is one of the few programs where the implementation language is a genuine engineering headline rather than trivia.
Concept mock, not affiliated with the project. Three facts are quoted from one row of GitHub Trending on 22 August 2026: the repository name, the language tag reading Go, and the description "TypeScript is a superset of JavaScript that compiles to clean JavaScript output." No performance figure, release version, or migration detail is represented, because that row publishes none.