Eliminate (ts as any).SyntaxKind (and similar) in favor of Debug.format functions #49485
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typescript-bot
added
Author: Team
For Uncommitted Bug
jakebailey
commented
Jun 10, 2022
| @@ -379,8 +379,9 @@ namespace ts { | |||
| JSDocFunctionType, | |||
| JSDocVariadicType, | |||
| JSDocNamepathType, // https://jsdoc.app/about-namepaths.html | |||
| JSDoc, | |||
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I've moved this up here because our debug helpers choose the earliest name as the printed name. It was previously defined with the markers, which meant we printed out the deprecated form instead.
jakebailey
commented
Jun 10, 2022
Comment on lines
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to
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| if (k === (ts as any).SyntaxKind.FirstJSDocNode || | ||
| k === (ts as any).SyntaxKind.LastJSDocNode || | ||
| k === (ts as any).SyntaxKind.FirstJSDocTagNode || | ||
| k === (ts as any).SyntaxKind.LastJSDocTagNode) { | ||
| for (const kindName in (ts as any).SyntaxKind) { | ||
| if ((ts as any).SyntaxKind[kindName] === k) { | ||
| return kindName; | ||
| } | ||
| } | ||
| } |
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Using ts.Debug.formatSyntaxKind is slower because it does a lot more work than these 4 hardcoded things. To regain the perf, I have another PR that will make formatSyntaxKind faster.
I still think it's better to not write the same enum-member-to-string code more than once, but it's annoying that a perf fix is required to do it.
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#49487 recovers the performance; it's 25% of the test run :(
weswigham
approved these changes
Jun 10, 2022
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This is a change pulled off of my module transform branch; these uses of
tsare often the only uses oftsin a file, so it's advantageous to remove them.But it also has the benefit of not duplicating logic to get the name of a
SyntaxKindor similar; you can see in the baselines that there are nodes that are incorrectly printed as "FirstNode". The harness code previously duplicated its own SyntaxKind printer and hardcoded a couple of markers, butformatSyntaxKindis smart enough to do that on its own.