feat: enable lazyCompilation.imports by default#5824
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chenjiahan merged 4 commits intomainfrom Aug 13, 2025
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Pull Request Overview
This PR enables lazy compilation imports by default in the development configuration. Lazy compilation is a webpack/Rspack feature that delays the compilation of certain modules until they are actually requested, which can improve development build performance.
- Added default lazy compilation configuration with imports enabled and entries disabled
- Updated test snapshots to reflect the new default configuration
- Simplified HMR client code by removing first compilation tracking logic
Reviewed Changes
Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| packages/core/src/defaultConfig.ts | Adds default lazy compilation configuration with imports enabled |
| packages/core/src/client/hmr.ts | Simplifies HMR logic by removing first compilation state tracking |
| packages/core/tests/snapshots/*.snap | Updates test snapshots to include new lazy compilation defaults |
| packages/compat/webpack/tests/snapshots/default.test.ts.snap | Updates webpack compatibility test snapshots |
| e2e/cases/nonce/dynamic-chunk/index.test.ts | Adds wait condition for dynamic chunk loading in tests |
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chenjiahan
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Aug 12, 2025
chenjiahan
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Aug 12, 2025
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Could you explain why you changed the HMR runtime code?
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Web socket connect too slow, so serve side will do first `lazyCompilation` completely quickly. But at this time, web socket is not connected.
So we need do a hmr action when web socket connect.
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Got it, great chart! This is very clear
chenjiahan
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Aug 12, 2025
chenjiahan
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Aug 13, 2025
This was referenced Aug 13, 2025
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Summary
Enable lazyCompilation.imports by default.
We need specify lazyCompilation.entries as false , because rspack will enable lazyCompilation.entries if you pass a object as lazyCompilation. more detail see: Rspack configuration.lazyCompilation
In lazyCompilation, we will do a hmr compile quickly, so we maybe complete the hmr compile before web socket connect done. It means we need do a hmr action when first web socket message send.
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