feat: support JSX preserve

[fi3ework]

Highlights 💡

Preserve JSX

Rslib supports setting the JSX runtime to 'preserve' to leave JSX syntax unchanged without transforming it, which is useful when you expect JSX to be left as is in library development.

// rslib.config.ts
import { pluginReact } from '@rsbuild/plugin-react';
import { defineConfig } from '@rslib/core';

export default defineConfig({
  lib: [
    // ...
  ],
  output: {
    target: 'web',
  },
  plugins: [
    pluginReact({
      swcReactOptions: {
        runtime: 'preserve',
      },
    }),
  ],
});

See JSX transform - React for more details.

Summary

third(final) step after web-infra-dev/rsbuild#6240.

Related Links

Checklist

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

[GRAMMAC1]

I see @rsbuild/react-plugin has been released 1.4.1, so when will this PR be merged and a new version be released?

[fi3ework]

@GRAMMAC1 1.4.2 expected.

[fi3ework]

@GRAMMAC1 i made a mistake. I just noticed that version 1.4.1 has shipped the commit this PR relies on. i will push this PR for merging now.

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[Copilot]

Pull Request Overview

This PR implements support for JSX preserve functionality in rslib, adding the ability to keep native JSX syntax in build outputs for further processing by other tools. This is the final step following a previous related PR.

• Adds JSX preserve runtime support with bundleless mode requirement
• Updates documentation to include the new 'preserve' option and usage examples
• Includes comprehensive test coverage for the new functionality

Reviewed Changes

Copilot reviewed 43 out of 44 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
website/docs/*/guide/solution/react.mdx	Updated documentation to include JSX preserve option and usage examples
packages/core/src/config.ts	Added bundle validation plugin and JSX file extension support for minification
tests/integration/preserve-jsx/	Added comprehensive test suite for JSX preserve functionality
tests/scripts/shared.ts	Extended file pattern matching to include .jsx files
Multiple package.json files	Updated @rsbuild/plugin-react dependency version to ^1.4.1

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Timeless0911]

@copilot Write a summary which similar to a release note.

[fi3ework]

@copilot Write a summary which similar to a release note.

[fi3ework]

@codex Write a summary which similar to a release note.

[chatgpt-codex-connector]

Summary

• Added an English blog entry that provides a release-note style overview of the new JSX preserve runtime support, including highlights, ecosystem notes, and setup guidance. website/docs/en/blog/jsx-preserve-runtime.mdxL1-L47
• Published the corresponding Chinese release-note article to keep localized documentation in sync. website/docs/zh/blog/jsx-preserve-runtime.mdxL1-L47
• Updated both English and Chinese blog indexes and metadata so the new article appears in navigation and listings. website/docs/en/blog/_meta.jsonL1-L1 website/docs/en/blog/index.mdxL10-L20 website/docs/zh/blog/_meta.jsonL1-L1 website/docs/zh/blog/index.mdxL10-L20

Testing

• ⚠️ Not run (documentation-only changes)

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