v1.2.0

SocAIty/SpeechCraftv1.2.0Jul 15, 2026by github-actions[bot]

AI Summary

This release introduces client-side Hot Module Replacement (HMR) and significant improvements to sourcemap handling, tree-shaking, and TypeScript configuration management to streamline the build process.

Key Highlights

Implemented client-side HMR for faster development feedback
Enhanced sourcemap composition to preserve unmapped boundaries
Improved watch mode to automatically rebuild when tsconfig files change
Optimized `import.meta` handling and added a new `FILE_NOT_FOUND` error

New Features

Client-side HMR implementation
Skip shipping factories for newly imported top-level modules
Per-client ship map for HMR patch sizing
Treat `import.meta['url']` and `import.meta['ROLLUP_FILE_URL_*']` as side-effect free
Add `FILE_NOT_FOUND` error

Full Release Notes

## [1.2.0] - 2026-07-15

### 🚀 Features

- dev: skip shipping factories for newly imported top-level modules (#10223) by @h-a-n-a
- dev: per-client ship map for HMR patch sizing (#10208) by @h-a-n-a
- dev: client-side HMR (#10164) by @h-a-n-a
- dev: send a full-reload update to clients when a tsconfig changes (#10262) by @shulaoda
- treat `import.meta['url']` and `import.meta['ROLLUP_FILE_URL_*']` as side-effect free (#10267) by @sapphi-red
- rewrite `import.meta['url']` (#10251) by @sapphi-red
- add `FILE_NOT_FOUND` error (#10220) by @sapphi-red
- treat `import.meta.ROLLUP_FILE_URL_*` as side-effect free (#10217) by @sapphi-red

### 🐛 Bug Fixes

- sourcemap: preserve unmapped boundaries during composition (#10254) by @hyfdev
- `[format]` in `*FileNames` option for ESM format should be `es` instead of `esm` (#10214) by @sapphi-red
- sourcemap: preserve coarse mappings during composition (#10249) by @hyfdev
- rolldown_plugin_vite_import_glob: support tsconfig paths with `import.meta.glob` (#10167) by @sapphi-red
- dev: clear tsconfig caches for bare full builds (#10276) by @shulaoda
- dev: force a full rebuild when a tsconfig changes (#10261) by @shulaoda
- treat rooted drive-less module ids as absolute in preserveModules naming (#10235) by @IWANABETHATGUY
- watch: rebuild when tsconfig files change (#10258) by @shulaoda
- watch: drop tsconfig-merged transform options on each rebuild (#10257) by @shulaoda
- incorrect `EMPTY_IMPORT_META` warning for `import.meta.ROLLUP_FILE_URL_*` for CJS output (#10221) by @sapphi-red
- deconflict: rename CJS locals shadowing wrapped-ESM namespace objects (#9970) by @IWANABETHATGUY
- rolldown: drop the unused runtime module after entry-level external flattening (#10237) by @IWANABETHATGUY
- rolldown: re-propagate has_dynamic_exports to transitive star importers (#10239) by @IWANABETHATGUY
- tree-shaking: tree-shake destructured dynamic import namespace bindings (#10213) by @logaretm
- s390x: use json-escape-simd 3.1.1 for big-endian JSON escaping fix (#10211) by @satyamg1620

### 🚜 Refactor

- dev: move full-reload to client side (#10207) by @h-a-n-a
- readability follow-ups to the ReplaceWith migration (#10286) by @IWANABETHATGUY
- replace take_in-then-write-back with ReplaceWith and by-value moves (#10285) by @Boshen
- share the main resolver's cache with the transformer's tsconfig lookups (#10205) by @shulaoda
- rolldown: extract the ns star-external __reExport emission rule into LinkingMetadata (#10238) by @IWANABETHATGUY
- rolldown: unify link/generate diagnostics into a Diagnostics accumulator (#10234) by @IWANABETHATGUY
- sourcemap_filenames: drop dead sourcemap-filename plumbing (#10189) by @IWANABETHATGUY
- extract external import symbol merging into a method (#10224) by @IWANABETHATGUY
- rolldown: skip CJS namespace merging under strict execution order (#10203) by @hyfdev
- resolve the manual tsconfig per file instead of once at startup (#10200) by @shulaoda
- rolldown: route interop ESM init emission through a shared init-target view (#10202) by @hyfdev
- rolldown: collapse vestigial wrap-kind state and share chunk sort helper (#10201) by @hyfdev

### 📚 Documentation

- show plugin kinds in JSDoc and each hook's description (#10218) by @sapphi-red
- add an explanation about removing imports from external modules without any messages (#10215) by @sapphi-red

### ⚡ Performance

- sourcemap: owned merge in SourceJoiner::join (4005->5 allocs/chunk) (#10250) by @Boshen
- avoid redundant sourcemap string copies in collapse and minify paths (#10093) by @Boshen

### 🧪 Testing

- code-splitting: establish strict-order review baselines (#10287) by @hyfdev
- dev: add hot API test cases (#10181) by @h-a-n-a
- code-splitting: normalize strict execution order variants (#10277) by @hyfdev
- code-splitting: harden strict execution order coverage (#10252) by @hyfdev
- code-splitting: add strict execution order regressions (#10253) by @hyfdev

### ⚙️ Miscellaneous Tasks

- deps: update github actions (#10241) by @renovate[bot]
- deps: update oxc to 0.140.0 (#10274) by @shulaoda
- update Yunfei's GitHub username (#10275) by @hyfdev
- deps: update napi (#10260) by @renovate[bot]
- deps: update test262 submodule for tests (#10266) by @rolldown-guard[bot]
- deps: update dependency vite-plus to v0.2.4 (#10256) by @renovate[bot]
- deps: update napi (#10240) by @renovate[bot]
- deps: update oxc resolver to v11.24.2 (#10245) by @renovate[bot]
- deps: update rust crates (#10244) by @renovate[bot]
- disable Renovate updates for idna_adapter (#10248) by @shulaoda
- deps: update oxc resolver to v11.24.1 (#10232) by @renovate[bot]
- deps: update rust crate oxc_sourcemap to v8.1.1 (#10233) by @renovate[bot]
- deps: update dependency rolldown-plugin-dts to ^0.27.0 (#10206) by @renovate[bot]
- deps: upgrade sugar_path to v3 (#10230) by @hyfdev
- add `dist-*` to `.gitignore` in sourcemap-filenames/hash-final-content fixture (#10216) by @sapphi-red
- deps: update dependency rust to v1.97.0 (#10209) by @renovate[bot]

### ❤️ New Contributors

* @satyamg1620 made their first contribution in [#10211](https://github.com/rolldown/rolldown/pull/10211)

Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>