perf(linter): id-length: check if ident is ASCII before segmenting#14767
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…14767) Profiling shows that segmenting into graphemes is much slower than just looking at the number of bytes. A simple check on `is_ascii` allows us to avoid splitting into graphemes and use the identifier length instead, which is much faster. We could optimize this further in the future by doing some faster ASCII check, but this is a good start.
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…ks (#14821) Previous PR (#14767) implemented an initial ASCII check, but I forgot to add it to the other identifier checks as well. This now adds the fast path ASCII check to all of the branches for this rule. In addition, we no longer need to call `.to_string()` to allocate for each identifier, we can simply do the exceptions check with `&str`. This should greatly benefit large files which have lots of identifiers, but this will pretty much universally improve perf on every file since this rule runs on every identifier and almost every JS file has identifiers. <img width="714" height="535" alt="image" src="https://github.com/user-attachments/assets/f67a43e8-0e91-4f6d-805b-a031f9881c74" />
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Profiling shows that segmenting into graphemes is much slower than just looking at the number of bytes. A simple check on
is_asciiallows us to avoid splitting into graphemes and use the identifier length instead, which is much faster. We could optimize this further in the future by doing some faster ASCII check, but this is a good start.