perf(fmt): load stdin formatter on demand - #169
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Summary
rs fmtcurrently loads the stdin formatter, Prettier, and bundled parser support for every invocation, including--helpand file-based formatting. This change loads./stdin.tsonly after--stdin-filepathselects stdin mode and emits it as the separatefmtStdinchunk, preserving stdin behavior while avoiding formatter startup work for other modes.Performance
Measured on macOS arm64 with Node.js v24.12.0 using
hyperfine --warmup 5 --runs 30 'node packages/rstack/bin/rs.js fmt --help':This reduces mean startup time by approximately 33%.
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