fix: should set output charset for swc-loader

[chenjiahan]

Summary

Set the charset option of swc-loader to ensure that the charset is consistent in all cases.

Related Links

• fix(schema): add jsc.output.charset of swc-loader rspack#10668

Checklist

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

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[Copilot]

Pull Request Overview

This PR updates the SWC loader configuration to propagate the output charset from the normalized environment config.

• Refactor getDefaultSwcConfig to accept an object including config
• Add jsc.output.charset based on config.output.charset
• Update all call sites to pass the new parameter object

Comments suppressed due to low confidence (3)

packages/core/src/plugins/swc.ts:65

• [nitpick] The parameter named config shadows the outer config variable; consider renaming it (e.g., envConfig) for clarity.

function getDefaultSwcConfig({

packages/core/src/plugins/swc.ts:65

• [nitpick] Consider adding or updating a JSDoc comment for getDefaultSwcConfig to document the new output.charset setting.

function getDefaultSwcConfig({

packages/core/src/plugins/swc.ts:89

• There's no existing test verifying that output.charset is correctly set; consider adding a unit test to cover this new behavior.

output: {