You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
ImprovementsKind: in v2.1.275,
ImprovementsSection of the release
What
The map used to detect a file's language from its extension now includes .cjs (mapped to JavaScript) and .mts and .cts (both mapped to TypeScript), alongside the existing .jsx, .js, and .mjs entries.
Why
This lets Claude Code correctly recognize these CommonJS and TypeScript module file extensions wherever the language is used, such as syntax highlighting or file-type-aware behavior.
