fix: should render default exports for cjs entry and json entry

[JSerFeng]

Summary

Render cjs entry and default export for json entry module

See tests for detail

// input.json
{ "foo": 42 }

// output.js
var __webpack_export_foo = 42
export { __webpack_export_foo as foo }
export default { "foo": __webpack_export_foo }

Related links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR fixes the rendering of default exports for CommonJS (CJS) entries and JSON entries in module library output. The fix ensures that when using module library types, both CJS modules and JSON files generate appropriate default exports alongside named exports.

Key changes:

• Added export type detection to determine when to render default exports
• Refactored export rendering to support both named and default export patterns
• Added comprehensive test coverage for both module and modern-module library types with JSON and CJS entries

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
crates/rspack_plugin_library/src/module_library_plugin.rs	Updated export rendering logic to handle different export types and generate default exports when needed
crates/rspack_plugin_library/src/modern_module_library_plugin.rs	Added export type detection and refactored export rendering functions to support both named and default exports
tests/rspack-test/configCases/library/module-json-entry/*	Added test case for module library type with JSON entry
tests/rspack-test/configCases/library/modern-module-json-entry/*	Added test case for modern-module library type with JSON entry
tests/rspack-test/configCases/library/modern-module-cjs-entry/*	Added test case for modern-module library type with CJS entry

Comments suppressed due to low confidence (1)

crates/rspack_plugin_library/src/module_library_plugin.rs:1

• [nitpick] Missing space after '=' operator. Should be 'module.exports = {' for consistent formatting.

use std::hash::Hash;

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[Copilot]

The result of render_as_default_export(&exports) is not being used. This function returns a String that should be added to the source, but the return value is being discarded.

Suggested change

	render_as_default_export(&exports);
	source.add(RawStringSource::from(render_as_default_export(&exports)));

[Copilot]

The result of render_as_default_export(&exports) is not being used. This function returns a String that should be added to the source, but the return value is being discarded.

Suggested change

	render_as_default_export(&exports);
	source.add(RawStringSource::from(render_as_default_export(&exports)));

[Copilot]

When there's no exported name, the local variable name is used directly in the object literal, but this could create invalid JavaScript if the local name contains special characters or is a reserved word. Consider using property shorthand syntax or proper escaping.

[github-actions]

📦 Binary Size-limit

Comparing 6c47df0 to chore(deps): update patch npm dependencies (#11806) by renovate[bot]

🎉 Size decreased by 278.88KB from 47.89MB to 47.62MB (⬇️0.57%)

[codspeed-hq]

CodSpeed Performance Report

Merging #11860 will not alter performance

_{Comparing feat/json-export-default (6c47df0) with main (a915dab)}

Summary

✅ 17 untouched