fix(64627): reject deferred imports without namespace bindings - #64640
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Oleksandr Tarasiuk (a-tarasyuk) wants to merge 2 commits into
Open
Oleksandr Tarasiuk (a-tarasyuk) wants to merge 2 commits into
Oleksandr Tarasiuk (a-tarasyuk) wants to merge 2 commits into
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Oleksandr Tarasiuk (a-tarasyuk)
October 5, 2026 10:33
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Copilot review overview
🟡 Changes recommended
The new diagnostic is filtered out for ordinary JavaScript files when checkJs is unset.
Review effort: Balanced
Findings: 1
What changed in this PR
Addresses #64627 by preserving deferred import clauses without bindings so the compiler can report a namespace-binding error.
Changes:
- Retains empty deferred import clauses and adds TS18116.
- Simplifies default-import helper detection.
- Expands TypeScript and JavaScript coverage across ESNext and CommonJS.
| File | Description |
|---|---|
tsc/testdata/tests/cases/conformance/importDefer/importDeferInvalidDefault.ts |
Adds missing-binding cases and module variants. |
tsc/testdata/baselines/reference/conformance/importDeferInvalidDefault(module=esnext).types |
Records ESNext types. |
tsc/testdata/baselines/reference/conformance/importDeferInvalidDefault(module=esnext).symbols |
Records ESNext symbols. |
tsc/testdata/baselines/reference/conformance/importDeferInvalidDefault(module=esnext).js |
Updates ESNext emit expectations. |
tsc/testdata/baselines/reference/conformance/importDeferInvalidDefault(module=esnext).errors.txt |
Records ESNext diagnostics. |
tsc/testdata/baselines/reference/conformance/importDeferInvalidDefault(module=commonjs).types |
Updates CommonJS types. |
tsc/testdata/baselines/reference/conformance/importDeferInvalidDefault(module=commonjs).symbols |
Updates CommonJS symbols. |
tsc/testdata/baselines/reference/conformance/importDeferInvalidDefault(module=commonjs).js |
Records CommonJS emit expectations. |
tsc/testdata/baselines/reference/conformance/importDeferInvalidDefault(module=commonjs).errors.txt |
Records CommonJS diagnostics. |
tsc/testdata/baselines/reference/conformance/importDeferInvalidDefault.errors.txt |
Removes the unparameterized diagnostic baseline. |
tsc/internal/transformers/moduletransforms/externalmoduleinfo.go |
Simplifies default-helper detection. |
tsc/internal/parser/parser.go |
Preserves empty deferred import clauses. |
tsc/internal/diagnostics/diagnostics_generated.go |
Registers TS18116. |
tsc/internal/diagnostics/diagnosticMessages.json |
Defines the namespace-binding diagnostic. |
tsc/internal/diagnostics/diagnosticMessages.generated.json |
Adds the generated diagnostic message. |
tsc/internal/checker/grammarchecks.go |
Rejects deferred imports without bindings. |
Files not reviewed (1)
- tsc/internal/diagnostics/diagnostics_generated.go: Generated file
Oleksandr Tarasiuk (a-tarasyuk)
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Copilot started reviewing on behalf of
Oleksandr Tarasiuk (a-tarasyuk)
October 5, 2026 11:01
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Copilot review overview
🟢 Approval recommended
The focused parser and diagnostic changes have matching regression baselines, with no unresolved blocking issues.
Review effort: Balanced
Findings: None
Resolved since last review (1)
Files not reviewed (1)
- tsc/internal/diagnostics/diagnostics_generated.go: Generated file
Ryan Cavanaugh (RyanCavanaugh)
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Oct 5, 2026
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Fixes #64627