perf: add ASCII fast path and codepoint iteration to avoid Intl.Segmenter#72
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sindresorhus merged 2 commits intosindresorhus:mainfrom Feb 18, 2026
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I'm happy to accept 1, those are easy wins, but I don't really want 2. It complicates the codebase significantly again, and |
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Problem
Intl.SegmenterandstripAnsirun on every call regardless of input. For ASCII strings like"hello world", the segmenter alone costs ~4µs — but width = length.Changes
ASCII fast path
/^[\u0020-\u007E]*$/to detect pure printable ASCII — skip segmenter/regex/EAW entirelystripAnsi guard
stripAnsiwhen no ESC (\x1B) or CSI (\x9B) presentPerformance (Apple M2 Max, Node 25.2.1)
Non-ASCII inputs (CJK, emoji, mixed) are unaffected — they fall through to the existing
Intl.Segmenterpath.All 198 tests pass.
Upstream
Ref: #71