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Handle synthetic tslib and JSX factory imports by jakebailey · Pull Request #780 · microsoft/typescript-go · GitHub
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Handle import helpers and JSX factory imports
Handle synthetic tslib and JSX factory imports
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This was referenced Apr 9, 2025
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| @@ -0,0 +1,44 @@ | |||
| --- old.commentsOnJSXExpressionsArePreserved(jsx=react-jsx,module=commonjs,moduledetection=auto).errors.txt | |||
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This is broken because we do not correctly set the module indicators.
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| ->notAHelper : Symbol(notAHelper, Decl(tslib.d.ts, --, --)) | ||
| - | ||
| +>notAHelper : Symbol(notAHelper, Decl(tslib.d.ts, 0, 12)) |
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Funny, Strada's regex here is bad, while in Corsa we "fixed" this.
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Future TODO: stop using synthetic nodes for this, because we only use them to then plug into module resolution anyway. There's no real reason to use a Node here other than "the code used to work this way and it's not very trivial to change", but changing it will be faster and make the loader lock-free again. |
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Fixes #765
Fixes #767
This implements import helper and JSX factory import node synthesis and resolution. Since the AST node is immutable, we cannot modify
SourceFile.Imports. This info is now stored on theProgramrather than at special fixed offsets inimportsthat's mutated after parse.This could allow us to reuse ASTs more often, and means we stop having to work around these synthesized imports in other parts of the code (LS features, mainly).
This PR isn't perfect; it turns out we're missing implementations of
moduleDetectionandexternalModuleIndicator, so we're not correctly determining that JSX files are modules because thejsxsetting plays a part in determining if a file is a module (yay).Fixing that will have to be a follow-up PR but that's going to be a lot more invasive. This PR fixes most stuff as it is now.