@rspack/cli 1.5.0-beta.0

on Node.js NPM

Highlights

Here's a sneak peek at the exciting new features coming in Rspack 1.5.0.

Module Federation Module Hoisting

#10524

This update introduces a runtime module that initializes federation during Rspack's runtime phase—similar to Webpack v1's Module Federation. The federation runtime is hoisted into runtime chunks, bypassing normal code-splitting rules, so it's eagerly available at startup.

Impact: In multi-entry applications using Module Federation, this can reduce bundle size by ~60%.

More details: https://gist.github.com/ScriptedAlchemy/a71ccbdfb933e8a4cd0131801a2c26b5#file-hoisted-runtime-internal-md

Rspack's Built-in Watcher

#10658

We've implemented a Rust-based file system watcher to improve performance in large-scale file change scenarios. Moving file watching into Rust also cuts down on overhead across the NAPI boundary.

Custom Native Binding

#10857

Want to build high-performance plugins for Rspack? This feature makes it easier. If writing a Rust plugin feels daunting, check out The Rspack Book—the first section covers customizing a Rspack binding step-by-step.

🎉 @rspack/browser

#10870

Yes, you can now run Rspack directly in the browser! We've even built a web REPL so you can try it instantly: repl.rspack.rs 🚀

Built-in Virtual Module Plugin

#11021

Thanks to @nilptr's contribution, Rspack now includes a built-in Virtual Modules plugin. If you work with a large number of virtual modules, this plugin helps Rspack maintain top performance even at scale.

Drop support for Node 16

#11338

@rspack/core v1.5 will no longer support Node 16, as Node.js reached end-of-life on September 11th, 2023. Many npm packages in the ecosystem have also dropped support for Node 16 (such as webpack-dev-server, css-loader, sass-loader, etc.), making it increasingly difficult to maintain compatibility.

Miscellaneous Updates

• Stabilized LazyCompilation feature—experiments.lazyCompilation is now available at the top level of Rspack's config.
• Deprecating experiments.topLevelAwait—setting it to false will now show a deprecation warning. This feature will be enabled by default and the config option removed in the next major release.

What's Changed

Performance Improvements ⚡

• perf: align number hash algorithm with webpack by @nilptr in #10643
• perf: improve bundle splitting part 2 by @LingyuCoder in #11233
• perf: improve process runtime requirements by @LingyuCoder in #11259
• perf: improve process concatenated configurations by @LingyuCoder in #11264
• perf: improve try_to_add of module concatenation by @LingyuCoder in #11279
• perf: improve add concatenated modules by parallelizing conneciton modifications by @LingyuCoder in #11286
• perf: parallel mangle exports by @LingyuCoder in #10877
• perf: Update swc and switch to wasmtime by @quininer in #11303
• perf: cache concatenated imports by @LingyuCoder in #11334

New Features 🎉

• feat: add resolver JavaScript API by @CPunisher in #11211
• feat(wasm): support @rspack/browser by @CPunisher in #10870
• feat: lazy make for reexport in side effects free barrel file by @ahabhgk in #11117
• feat: support persistent cache for lazy barrel by @ahabhgk in #11285
• feat: rspack cli add config path to build dependencies by @jerrykingxyz in #11288
• feat: expose experiments.swc in parallel loader context by @jbroma in #11300
• feat: propagate const for inline const by @ahabhgk in #11311
• feat!: update minimum Node.js version to 18.12.0 by @chenjiahan in #11338
• feat: module chunk HMR by @stormslowly in #11160
• feat: move experiments.lazyCompilation to configuration toplevel by @GiveMe-A-Name in #11337
• feat: add VirtualModulesPlugin by @nilptr in #11021

Bug Fixes 🐞

• fix(types): change HotUpdateStatus from enum to union type by @chenjiahan in #11238
• fix: JsResolverFactory should cache Resolver instance based on different options by @SyMind in #11245
• fix: lifetime error by @LingyuCoder in #11260
• fix: avoid render weak import dependency by @ahabhgk in #11262
• fix: buildDependencies skip resolve nodejs builtin module by @jerrykingxyz in #11256
• fix: handle unwatch errors gracefully and improve native watcher integration by @GiveMe-A-Name in #11210
• fix: get resolve in externals should return query by @SyMind in #11276
• fix: CssGetFilenameRuntime should detect runtime requirements correctly by @JSerFeng in #11271
• fix: update lazy compilation middleware order to apply devServer Middleware by @GiveMe-A-Name in #11157
• fix: not changed related source-map when rename asset by @SyMind in #11293
• fix: swc transform api output sourcemaps by @jbroma in #11299
• fix: pass actual root context to parallel loader context by @jbroma in #11301
• fix: missing code generation report by @LingyuCoder in #11308
• fix: split chunks min chunks config with enforce by @SyMind in #11294
• fix: should not render export in modern-module when iife enabled by @Timeless0911 in #11317
• fix: export the missing PathData type by @colinaaa in #11315
• fix: rsdoctor multi compiler data scope by @LingyuCoder in #11310
• fix: batch rename_asset with parallel optimization by @SyMind in #11325
• fix: should synchronously bind html plugin hooks in sri plugin by @LingyuCoder in #11342

Refactor 🔨

• refactor: remove features that are not supported in stable Rust by @h-a-n-a in #11243
• refactor: move make dir by @jerrykingxyz in #11244
• refactor: bench external getResolve & remove ResolveClosureContext by @SyMind in #11171
• refactor: move builtin loader registration to plugin by @h-a-n-a in #11258
• refactor: limit exported symbols in rspack_binding_api by @h-a-n-a in #11263
• refactor: remove redundant PluginContext and async_trait from trait Plugin by @h-a-n-a in #11272
• refactor: streamline native watcher path management and API design by @GiveMe-A-Name in #11282
• refactor: remove __rust_probestack workaround by @h-a-n-a in #11326

Document Updates 📖

• docs: add docs for lazy barrel by @ahabhgk in #11274
• docs: add docs for custom binding crates by @h-a-n-a in #11290
• docs(rspress): upgrade to 2.0.0-beta.25 by @SoonIter in #11312
• docs: add Rslint to the list of Rstack tools by @chenjiahan in #11318
• docs: add version badges to Rstack tools table by @chenjiahan in #11321
• docs(quick-start): update runtime installation instructions by @chenjiahan in #11327

Other Changes

• chore: bump rust toolchain to 2025-07-28 by @h-a-n-a in #11217
• chore: release v1.4.11 by @GiveMe-A-Name in #11215
• chore(releasing): should not publish testing crates by @h-a-n-a in #11248
• chore: add crates.io badge by @h-a-n-a in #11250
• chore: upgrade rslint@0.1.0 by @hardfist in #11253
• chore: upgrade rslint to 0.1.1 by @hardfist in #11261
• chore: ignore moduleFederationDefaultRuntime.js in rslint by @stormslowly in #11269
• chore(wasm): release @rspack/browser by @CPunisher in #11254
• chore: supporting linux cache compressing with zstd by @stormslowly in #11270
• chore: upgrade rslint to 0.1.3 by @hardfist in #11267
• chore(deps): update github-actions by @renovate[bot] in #11295
• chore(deps): update napi by @renovate[bot] in #11296
• chore: deprecated experiments.topLevelAwait config by @stormslowly in #11284
• chore(deps): update dependency @playwright/test to v1.54.2 by @renovate[bot] in #11298
• chore: remove from rspack_binding_api in CODEOWNERS by @h-a-n-a in #11307
• chore: upgrade rslint@0.1.5 by @hardfist in #11316
• chore(ci): update test node matrix by @stormslowly in #10871
• chore(deps): update dependency prebundle to ^1.4.1 by @renovate[bot] in #11348
• chore(deps): update dependency memfs to v4.36.0 by @renovate[bot] in #11347
• chore(deps): update dependency typescript to ^5.9.2 by @renovate[bot] in #11323
• chore(ci): use npm trusted publish by @stormslowly in #11343

Full Changelog: v1.4.11...v1.5.0-beta.0