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Preserve non-module errors for imports without attributes - #64884
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Gabriela Araujo Britto (gabritto) merged 2 commits intoOct 26, 2026
Merged
Gabriela Araujo Britto (gabritto) merged 2 commits into
Gabriela Araujo Britto (gabritto) merged 2 commits into
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🟢 Approval recommended
The narrow guard restores the intended resolution order, with matching regression coverage and no identified blocking issues.
No open issues 🎉
What changed in this PR
Restores TS2306 diagnostics when imports without attributes resolve to non-module files, addressing #64882 while preserving attribute-based ambient module resolution.
Changes:
- Guards pattern ambient fallback for resolved scripts.
- Adds regression tests and diagnostic baselines covering resolution paths, empty attributes, and empty modules.
| File | Description |
|---|---|
tsc/testdata/tests/cases/compiler/patternAmbientModuleResolvedScriptWithoutPaths.ts |
Tests resolution without path mappings. |
tsc/testdata/tests/cases/compiler/patternAmbientModuleResolvedScript.ts |
Tests resolved scripts and attribute precedence. |
tsc/testdata/tests/cases/compiler/patternAmbientModuleResolvedEmptyModule.ts |
Tests empty-module resolution precedence. |
tsc/testdata/baselines/reference/compiler/patternAmbientModuleResolvedScriptWithoutPaths.errors.txt |
Records diagnostics without path mappings. |
tsc/testdata/baselines/reference/compiler/patternAmbientModuleResolvedScript.errors.txt |
Records restored non-module errors. |
tsc/testdata/baselines/reference/compiler/patternAmbientModuleResolvedEmptyModule.errors.txt |
Records empty-module diagnostics. |
tsc/internal/checker/checker.go |
Limits resolved-script fallback to nonempty attributes. |
Review effort: Balanced
Jake Bailey (jakebailey)
requested a review
from Andrew Branch (andrewbranch)
October 20, 2026 16:50
Andrew Branch (andrewbranch)
approved these changes
Oct 20, 2026
Harsh Mandan (harshmandan)
added a commit
to harshmandan/svelte-check-native
that referenced
this pull request
Oct 27, 2026
First nightly with the TS2306 ordering restored (built from 49e69830, the merge of microsoft/TypeScript#64884 for #64882): an import that resolves to a non-module file reports TS2306 again instead of falling back to a pattern ambient module. Fixtures 502 and 503 pass, and the full suite is green (1293 passed, 0 failed).
Harsh Mandan (harshmandan)
added a commit
to harshmandan/svelte-check-native
that referenced
this pull request
Oct 27, 2026
First nightly with the TS2306 ordering restored (built from 49e69830, the merge of microsoft/TypeScript#64884 for #64882): an import that resolves to a non-module file reports TS2306 again instead of falling back to a pattern ambient module. Fixtures 502 and 503 pass, and the full suite is green (1293 passed, 0 failed).
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fixes #64882
fixes a, what seems to be an unintended, behavioral change from #63931 , given this statement from that PR:
cc Gabriela Araujo Britto (@gabritto)