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Fix JSX semicolon insertion - #6241
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Also revert previous hack to in ExpressionStatement that fixes the issue in some situations.
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lukastaegert
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Pull request overview
This PR fixes a bug where semicolons were incorrectly positioned or removed when transpiling JSX elements with key attributes in React's automatic JSX runtime mode. The issue occurred when the key attribute was moved to the end of the element, interfering with parent statement nodes (ExpressionStatement and VariableDeclaration) that needed to append semicolons.
Changes:
- Fixed typo
openindEnd→openingEndin JSXElement.ts - Changed semicolon insertion to use
attributesEndinstead of element end position to prevent interference with code movement - Changed ExpressionStatement semicolon insertion from
appendRighttoappendLeftfor consistency - Added comprehensive test coverage for variable declarations with key attributes
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| src/ast/nodes/JSXElement.ts | Fixed typo and introduced attributesEnd logic to prevent semicolon removal when key attributes are moved |
| src/ast/nodes/ExpressionStatement.ts | Changed semicolon insertion from appendRight to appendLeft for consistent positioning |
| test/form/samples/jsx/react-jsx-declarations-with-key-attribute/main.js | Added test input with various JSX declaration scenarios with key attributes |
| test/form/samples/jsx/react-jsx-declarations-with-key-attribute/_expected.js | Expected transpilation output showing correct semicolon placement |
| test/form/samples/jsx/react-jsx-declarations-with-key-attribute/_config.js | Test configuration for react-jsx mode with key attribute handling |
| .github/copilot-instructions.md | Added guidance to ignore style issues in test sample files and focus on production code |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #6241 +/- ##
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Coverage 98.81% 98.81%
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Files 272 272
Lines 10720 10720
Branches 2870 2870
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Hits 10593 10593
Misses 85 85
Partials 42 42 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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Description
Previously, we fixed the semicolon insertion issue for ExpressionStatements by changing how the semicolon was inserted. However, we did not perform a similar change for VariableDeclarations, and here, the situation is a bit more complicated to fix.
The core of the problem was that when using automatic rendering mode, the "key" attribute could be moved to the end of a self-closing element, and moved code would always appear after any left-appended code.
This in turn affects ExpressionStatement and VariableDeclaration parents, which may want to append a semicolon.
For VariableDeclarations, rightAppending is not a solution because sometimes, the next declaration is removed, which would also remove the semicolon again.
The fix implemented here is never to move to the last position of the JSXElement but instead to the end of the non-key-attributes, which is always inside the element and does not cause issues.