perf: Use a memoized key lookup for rules #615
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On my project, this makes ESLint as a whole roughly 8% faster, and it seems to result in consistently faster benchmarks. Note a behavior change - member expressions used to find the first matching rule, while they now favor the more general rule if relevant. (I believe this change is an improvement: "Promise is not supported in IE 10" is a more helpful message than "Promise.reject() is not supported in IE 10".)
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Sorry to nag, but is there anything I can do to help things progress with this PR? I'd love to benefit from the performance improvements in my projects if it's not too much trouble. |
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On my project, this makes ESLint as a whole roughly 8% faster, and it seems to result in consistently faster benchmarks.
Note a behavior change - member expressions used to find the first matching rule, while they now favor the more general rule if relevant. (I believe this change is an improvement: "Promise is not supported in IE 10" is a more helpful message than "Promise.reject() is not supported in IE 10".)