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Return freshly cached post-super flow results - #65471
Merged
Jake Bailey (jakebailey) merged 2 commits intoNov 13, 2026
Merged
Jake Bailey (jakebailey) merged 2 commits into
Jake Bailey (jakebailey) merged 2 commits into
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The shared-flow slow path has already traversed the antecedents and recorded its answer. Return that result rather than immediately walking the same control-flow graph again. Exercise fully initialized and missing-super paths across shared branches, loops, and finally blocks.
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🟢 Approval recommended
No active review issues remain for the post-super() flow-analysis fix.
No open issues 🎉
What changed in this PR
This PR fixes a missing return in the native TypeScript checker so post-super() flow analysis immediately returns a freshly computed and cached result.
Changes:
- Return
postSuperafter caching it. - Add regression coverage for branching constructors, repeated
thisaccesses, loops, andtry/finally. - Add baselines recording expected diagnostics, JavaScript output, types, and symbols.
| File | Description |
|---|---|
tsc/testdata/tests/cases/compiler/postSuperSharedFlow.ts |
Tests valid and missing-super() flow paths. |
tsc/testdata/baselines/reference/compiler/postSuperSharedFlow.types |
Records expected type information. |
tsc/testdata/baselines/reference/compiler/postSuperSharedFlow.symbols |
Records expected symbol information. |
tsc/testdata/baselines/reference/compiler/postSuperSharedFlow.js |
Records expected JavaScript output. |
tsc/testdata/baselines/reference/compiler/postSuperSharedFlow.errors.txt |
Records two expected accesses to this before super(). |
tsc/internal/checker/flow.go |
Returns the freshly cached post-super() flow result. |
Review effort: Balanced
Jake Bailey (jakebailey)
requested review from
Anders Hejlsberg (ahejlsberg) and
Gabriela Araujo Britto (gabritto)
November 13, 2026 18:10
The compiler case produces the same baselines without the new return. It does not protect against repeating the completed flow traversal, so retaining it would overstate the regression coverage.
Jake Bailey (jakebailey)
requested a review
from Gabriela Araujo Britto (gabritto)
November 13, 2026 19:20
Gabriela Araujo Britto (gabritto)
approved these changes
Nov 13, 2026
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This was missing a return.