Use .mjs/.cjs extension for runtime files #8207
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Pull request overview
This PR updates the ReScript runtime files to use explicit module system file extensions (.mjs for ES modules and .cjs for CommonJS) instead of the generic .js extension, eliminating the need for a package.json override in the CommonJS directory.
Changes:
- Updated all import/require statements in runtime files to use the correct file extensions
- Modified compiler logic to generate the appropriate file extensions for runtime modules
- Removed runtime package specs configuration that was previously needed
Reviewed changes
Copilot reviewed 116 out of 587 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
packages/@rescript/runtime/lib/js/*.cjs |
Updated require statements to use .cjs extension instead of .js |
packages/@rescript/runtime/lib/es6/*.mjs |
Updated import statements to use .mjs extension instead of .js |
compiler/core/js_packages_info.ml |
Removed runtime package specs configuration and related comments |
compiler/core/js_name_of_module_id.ml |
Added logic to determine runtime file extensions based on module system |
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nojaf
approved these changes
Jan 21, 2026
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Currently, the JS files in
packages/@rescript/runtime/lib/es6packages/@rescript/runtime/lib/jsall have the extension
.jsand not the specific extension for their module system.Therefore,
packages/@rescript/runtime/lib/js/package.jsonis needed to override the module system for the commonjs files.This PR instead adds the specific file extension for each module system:
packages/@rescript/runtime/lib/es6/*.mjspackages/@rescript/runtime/lib/js/*.cjsThis makes things clearer and allows us to get rid of the override.