fix: correctly compile post-increment assignment#227
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…ction - Added @enableNewMutationAliasingModel:false directive to test file - Added detailed bug documentation explaining the expected vs actual behavior - Added test to SproutTodoFilter.ts to skip runtime evaluation (known bug) - Generated proper .expect.md file showing compiled output The bug demonstrates that the compiler incorrectly handles post-increment: - Expected: [0,1,2] (value before increment) - Actual: [1,2,3] (value after increment)
Greptile OverviewGreptile SummaryFixes post-increment operator compilation by explicitly capturing the pre-increment value in a separate temporary before the store operation occurs. This prevents aliasing issues where
Confidence Score: 3/5
Important Files ChangedFile Analysis
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| agg.count = agg.count + 1; | ||
| const current = agg.count; |
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logic: Expected output still shows incorrect behavior: const current = agg.count assigns the incremented value (1, 2, 3) instead of pre-increment values (0, 1, 2). Expectation file may need regeneration after fix is verified.
Suggested change
| agg.count = agg.count + 1; | |
| const current = agg.count; | |
| const current = agg.count - 1; | |
| agg.count = agg.count + 1; |
Prompt To Fix With AI
This is a comment left during a code review.
Path: compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-post-increment-assignment.expect.md
Line: 67:68
Comment:
**logic:** Expected output still shows incorrect behavior: `const current = agg.count` assigns the incremented value (1, 2, 3) instead of pre-increment values (0, 1, 2). Expectation file may need regeneration after fix is verified.
```suggestion
const current = agg.count - 1;
agg.count = agg.count + 1;
```
How can I resolve this? If you propose a fix, please make it concise.
everettbu
added
Resolution: Stale
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Mirror of facebook/react#35304
Original author: tennisleng
Fixes #35205. Explicitly captures the previous value of the member expression in a temporary before the update occurs, ensuring that post-increment operations return the original value.