…g: false` (#6488)

### TL;DR

Added an experimental flag to control native MagicString sourcemap generation, allowing for both native and JavaScript-based sourcemap generation paths.
Sometimes on the JS side, users require that the sourcemap generation be **synced**, e.g.
https://github.com/rolldown/rolldown/blob/79fa18fdc978d4babf4c6ec45225b2802e38ddc9/packages/rolldown/src/plugin/transform-plugin-context.ts?plain=1#L80-L82

### What changed?

- Added an experimental flag `nativeMagicString` to control whether sourcemap generation happens in native Rust code or in JavaScript
- Modified the `ScanStage` to conditionally create the sourcemap generation thread based on this flag
- Updated the `TransformPluginContext.send_magic_string` method to return the sourcemap JSON string when native mode is disabled
- Updated the JavaScript binding to handle both modes, using the returned sourcemap when in JavaScript mode
- Added test fixtures for both enabled and disabled native MagicString modes

### How to test?

1. Run the new test fixtures:
   - `packages/rolldown/tests/fixtures/output/sourcemap/native-magic-string-true`
   - `packages/rolldown/tests/fixtures/output/sourcemap/native-magic-string-false`

2. Verify that sourcemaps are correctly generated in both modes.

3. Test with a real project by setting the experimental flag:
   ```js
   // rolldown.config.js
   export default {
     experimental: {
       nativeMagicString: true, // or false
     },
     // other config
   }
   ```

### Why make this change?

This change provides flexibility in how sourcemaps are generated, allowing for both native (Rust-based) and JavaScript-based approaches. This can be useful for debugging, performance testing, or compatibility purposes. The experimental flag allows users to choose the approach that works best for their specific use case.

## [1.0.0-beta.43] - 2025-10-13

### 🚀 Features

- add filterVitePlugins utility that uses to skip vite plugins using apply: "serve" (#6502) by @IWANABETHATGUY
- rolldown_plugin_vite_html: align partial can inline entry logic (#6500) by @shulaoda
- rolldown_plugin_vite_html: align get_imported_chunks logic (#6499) by @shulaoda
- rolldown_plugin_vite_html: align HtmlTagDescriptor (#6498) by @shulaoda
- rolldown_plugin_vite_html: align partial utility functions logic (#6497) by @shulaoda
- rolldown_html_vite_html: align partial inject chunk asset links logic (#6496) by @shulaoda
- rolldown_plugin_vite_html: align `processedHtml` logic (#6494) by @shulaoda
- add `nativeMagicString` options (#6469) by @IWANABETHATGUY
- rust: eagerly cleanup resources when calling `close` (#6483) by @hyf0
- rust: varify if bundler is closed for public API (#6481) by @hyf0
- replace [format] placeholder in chunk filename templates (#6476) by @elecmonkey
- implement synchronous JS callback invocation for paths function (#6474) by @IWANABETHATGUY
- rolldown_plugin_vite_html: align partial transform hook logic (#6471) by @shulaoda
- Support `output.paths` (#6470) by @IWANABETHATGUY
- rolldown_plugin_vite_html: align script urls handle logic (#6466) by @shulaoda
- add validation for `preserveEntrySignatures` with `includeDependenciesRecursively` option (#6468) by @hyf0
- rolldown_plugin_vite_html: align partial logic (#6465) by @shulaoda
- background sourcemap generation for Javascript transform hooks (#6293) by @IWANABETHATGUY
- rolldown_plugin_vite_html: handle style tag (#6464) by @shulaoda
- rolldown_plugin_vite_html: handle inline style attribute (#6463) by @shulaoda
- rolldown_plugin_vite_html: patially handle vite-ignore attribute (#6462) by @shulaoda
- dev/node: expose errors of `on_hmr_updatrs` to node (#6454) by @hyf0
- dev/node: expose errors of `on_output` to node (#6453) by @hyf0
- dev: expose hmr errors on `on_hmr_updatrs` callback (#6443) by @hyf0

### 🐛 Bug Fixes

- fallback sourcemap generation for `experimental.nativeMagicString: false` (#6488) by @IWANABETHATGUY
- take `resolve.modules` into account (#6484) by @Pickachu
- rolldown: increase tokio blocking threads size for watch mode (#6467) by @Brooooooklyn
- use len_utf16 in magic_string CharToByteMapper (#6461) by @IWANABETHATGUY
- pass `advancedChunks#includeDependenciesRecursively` to rust (#6448) by @hyf0
- dev: should compute hmr update correctly for multiple clients (#6442) by @hyf0
- allow specifying packageJsonPath in PluginContext.load (#6439) by @sapphi-red
- use transform.target as default for minify target when `minify: { compress: true }` (#6433) by @sapphi-red

### 🚜 Refactor

- extract background sourcemap handling into separate methods (#6501) by @IWANABETHATGUY
- rust: only expose methods of `Bundler` for public usage (#6480) by @hyf0
- dev/node: use napi object instead clss for `BindingClientHmrUpdate` (#6456) by @hyf0
- dev/node: improve `DevOnHmrUpdates` API (#6455) by @hyf0

### 📚 Documentation

- update team page and add acknowledgements page (#6495) by @hyf0
- restructure website and files (#6492) by @hyf0
- correct incorrect documentation about the config file (#6472) by @jsparkdev
- options: `experimental.strictExecutionOrder` (#6450) by @hyf0
- adding `why-plugin-hook-filter` in depth (#6446) by @IWANABETHATGUY

### ⚡ Performance

- rolldown: replace serde JSON string escape with simd impl (#6475) by @Brooooooklyn

### ⚙️ Miscellaneous Tasks

- docs: redirect removed path to new locations for compatibility (#6493) by @hyf0
- deps: lock file maintenance npm packages (#6490) by @renovate[bot]
- deps: update github-actions (major) (#6415) by @renovate[bot]
- deps: update github-actions (#6489) by @renovate[bot]
- rust: add comment for `DiagnosticOptions#stabilize_path` (#6447) by @hyf0
- rust: remove unused `BindingHmrOutput` (#6457) by @hyf0
- rolldown_plugin_vite_html: tweak `utils.rs` (#6460) by @shulaoda
- change node version to lts (#6435) by @iiio2
- rust/test: split hmr related structs into their own files (#6445) by @hyf0
- deps: update crate-ci/typos action to v1.38.1 (#6452) by @renovate[bot]
- rust/test: render hmr errors (#6444) by @hyf0
- examples: add `"type": "module"` in `package.json` (#6441) by @iiio2

### ❤️ New Contributors

* @Pickachu made their first contribution in [#6484](#6484)
* @elecmonkey made their first contribution in [#6476](#6476)
* @jsparkdev made their first contribution in [#6472](#6472)