Fix helpers emit for .cjs files in ESM module mode#61814
Merged
andrewbranch merged 3 commits intomicrosoft:mainfrom Jun 6, 2025
Merged
Fix helpers emit for .cjs files in ESM module mode#61814andrewbranch merged 3 commits intomicrosoft:mainfrom
andrewbranch merged 3 commits intomicrosoft:mainfrom
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Pull Request Overview
This PR fixes the helpers emission for .cjs files when running in ESM module mode by refining the underlying logic and adding new test cases.
- Adds a new test case (ctsFileInEsnextHelpers.ts) and updates the expected baselines.
- Adjusts module specifier resolution by removing the fallback to the source file’s implied node format.
- Refines the condition for emitting external helper imports to better distinguish between CommonJS and ES module formats.
Reviewed Changes
Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| tests/cases/compiler/ctsFileInEsnextHelpers.ts | Introduces a new test file for .cts files in ESM module mode. |
| tests/baselines/reference/ctsFileInEsnextHelpers.* | Updates baseline outputs (types, symbols, JS, errors) to reflect the new helper emit fix. |
| src/compiler/moduleSpecifiers.ts | Removes fallback to importingSourceFile.impliedNodeFormat, using overrideImportMode only. |
| src/compiler/factory/utilities.ts | Adjusts the condition for creating external helpers import to avoid CJS emission in ESM mode. |
Comments suppressed due to low confidence (1)
src/compiler/moduleSpecifiers.ts:515
- Removing the fallback to 'importingSourceFile.impliedNodeFormat' might lead to undefined behavior when overrideImportMode is not set; consider explicitly handling the unset case to ensure the module specifier is resolved as intended.
options.overrideImportMode || importingSourceFile.impliedNodeFormat,
andrewbranch
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Jun 4, 2025
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| return tslib_1.__awaiter(this, void 0, void 0, function () { | ||
| return tslib_1.__generator(this, function (_a) { |
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Before the change, emit was missing the tslib_1. on these
andrewbranch
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Jun 4, 2025
| impliedModuleKind !== ModuleKind.CommonJS && | ||
| ((moduleKind >= ModuleKind.ES2015 && moduleKind <= ModuleKind.ESNext) || | ||
| impliedModuleKind === ModuleKind.ESNext || | ||
| impliedModuleKind === undefined && moduleKind === ModuleKind.Preserve) |
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I was able to simplify this condition in Corsa since we’re removing System, AMD, and UMD. Opting to make the minimal change here rather than try to clean up.
andrewbranch
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Jun 4, 2025
weswigham
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Jun 5, 2025
weswigham
approved these changes
Jun 6, 2025
This was referenced Jun 30, 2025
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Noticed this while refactoring some code in Corsa.