# rspack v2.2.0

- Product: rspack (https://whatsnew.fyi/product/rspack)
- Vendor: rspack
- Date: 2026-08-26
- Version: v2.2.0
- Original notes: https://github.com/web-infra-dev/rspack/releases/tag/v2.2.0
- Permalink: https://whatsnew.fyi/product/rspack/releases/v2.2.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Implement generation-based memory cache eviction
- **added** — Add idle cache compaction with interruption handling
- **changed** — Improve unicode handling and support more CSS modules cases, boost performance
- **added** — Integrate module code generation to the new cache
- **added** — Add fine-grained new cache options
- **added** — Add compat-hashed module ids
- **added** — Analyze dynamic imports in Promise.all destructuring
- **added** — Integrate new cache into source map devtool plugin
- **added** — Add compilation.runtimeTemplate
- **added** — Add compact chunk ids
- **added** — Support opt-in per-loader caching
- **changed** — Cache converted module original source
- **changed** — Batch splitChunks JavaScript callbacks
- **changed** — Avoid parsing concatenated module codegen
- **changed** — Preallocate identifier path buffers
- **changed** — Intern ArcPath as a single-allocation prehashed path
- **changed** — Use rayon parallel scheduling for new cache db
- **changed** — Skip the directory walk for glob patterns without metacharacters
- **fixed** — Pass HMR error to Preact refresh recovery handler
- **fixed** — Strip BOM from module content before concatenation in CSS extraction

##### What's Changed

##### 🎉 See [Announcing Rspack 2.2](https://rspack.rs/blog/announcing-2-2) for more details.

###### New Features 🎉
* feat: implement generation-based memory cache eviction by @ahabhgk in https://github.com/web-infra-dev/rspack/pull/15181
* feat: add idle cache compaction with interruption handling by @ahabhgk in https://github.com/web-infra-dev/rspack/pull/15182
* feat(css): improve unicode handling and support more css modules cases, boost performance by @intellild in https://github.com/web-infra-dev/rspack/pull/14809
* feat: integrate module code generation to the new cache by @ahabhgk in https://github.com/web-infra-dev/rspack/pull/15194
* feat(cache): add fine-grained new cache options by @hardfist in https://github.com/web-infra-dev/rspack/pull/15261
* feat(ids): add compat-hashed module ids by @LingyuCoder in https://github.com/web-infra-dev/rspack/pull/14926
* feat: analyze dynamic imports in Promise.all destructuring by @JSerFeng in https://github.com/web-infra-dev/rspack/pull/15249
* feat: integrate new cache into source map devtool plugin  by @ahabhgk in https://github.com/web-infra-dev/rspack/pull/15269
* feat(core): add compilation.runtimeTemplate by @kakiuwang-ui in https://github.com/web-infra-dev/rspack/pull/15305
* feat(ids): add compact chunk ids by @LingyuCoder in https://github.com/web-infra-dev/rspack/pull/14959
* feat(loader): support opt-in per-loader caching by @intellild in https://github.com/web-infra-dev/rspack/pull/15236
###### Performance 🚀
* perf(binding): cache converted module original source by @SyMind in https://github.com/web-infra-dev/rspack/pull/15174
* perf: batch splitChunks JavaScript callbacks by @JSerFeng in https://github.com/web-infra-dev/rspack/pull/15147
* perf(binding): exclude test loaders from release builds by @chenjiahan in https://github.com/web-infra-dev/rspack/pull/15209
* perf(binding): exclude perfetto from release WASI builds by @chenjiahan in https://github.com/web-infra-dev/rspack/pull/15221
* perf(binding): align release WASI optimizations by @chenjiahan in https://github.com/web-infra-dev/rspack/pull/15227
* perf(binding): optimize React Compiler crates for size by @chenjiahan in https://github.com/web-infra-dev/rspack/pull/15230
* perf: avoid parsing concatenated module codegen by @LingyuCoder in https://github.com/web-infra-dev/rspack/pull/14852
* perf: preallocate identifier path buffers by @intellild in https://github.com/web-infra-dev/rspack/pull/15220
* perf(paths): intern ArcPath as a single-allocation prehashed path by @stormslowly in https://github.com/web-infra-dev/rspack/pull/15205
* perf: use rayon parallel scheduling for new cache db by @ahabhgk in https://github.com/web-infra-dev/rspack/pull/15251
* perf(core): skip the directory walk for glob patterns without metacharacters by @lazerg in https://github.com/web-infra-dev/rspack/pull/15297
* perf(split-chunks): skip single-chunk used exports grouping by @LingyuCoder in https://github.com/web-infra-dev/rspack/pull/15312
* perf(core): precompile filename templates cache by @intellild in https://github.com/web-infra-dev/rspack/pull/15195
###### Bug Fixes 🐞
* fix: pass HMR error to Preact refresh recovery handler by @chenjiahan in https://github.com/web-infra-dev/rspack/pull/15179
* fix(cache): limit shutdown compaction to a single pass by @ahabhgk in https://github.com/web-infra-dev/rspack/pull/15188
* fix(types): add missing stats fields by @chenjiahan in https://github.com/web-infra-dev/rspack/pull/15206
* fix(css-extract): strip BOM from module content before concatenation by @doxxx93 in https://github.com/web-infra-dev/rspack/pull/15169
* fix(core): decouple incremental artifacts from cache! by @hardfist in https://github.com/web-infra-dev/rspack/pull/15229
* fix(asset): preserve ESM imports in module output for "preserve" importMode by @JSerFeng in https://github.com/web-infra-dev/rspack/pull/15165
* fix(css): CSS module dashed identifier a

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