feat(deps): update @rspack/core to 1.4.0-beta.1

[chenjiahan]

Summary

Update @rspack/core to 1.4.0-beta.1 and adapt the latest the lazy compilation usage.

Related Links

• https://github.com/web-infra-dev/rspack/releases/tag/v1.4.0-beta.1
• refactor!: lazy compilation middleware supports multiCompiler and use config from compiler instance rspack#9828
• feat: integrate Rspack lazy compilation middleware #4881

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR updates @rspack/core to version 1.4.0-beta.1 and adapts the lazy compilation integration by removing the old middleware argument and adding a dedicated plugin.

• Bump @rspack/core dependency to 1.4.0-beta.1
• Remove deprecated dev.lazyCompilation argument from lazyCompilationMiddleware
• Introduce and register pluginLazyCompilation to configure the experiment via the bundler chain

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
packages/core/src/server/devMiddlewares.ts	Removed passing of dev.lazyCompilation argument to the middleware
packages/core/src/plugins/lazyCompilation.ts	Added pluginLazyCompilation to apply the lazyCompilation experiment
packages/core/src/createRsbuild.ts	Registered pluginLazyCompilation in the default plugin list
packages/core/package.json	Updated @rspack/core version to 1.4.0-beta.1

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (2)

packages/core/src/server/devMiddlewares.ts:148

• The lazyCompilationMiddleware signature has changed in v1.4.0-beta.1 and no longer accepts the lazyCompilation options as a third argument. Update this call to use the new API (e.g., pass options via an options object or chain configuration).

dev.lazyCompilation,

packages/core/src/plugins/lazyCompilation.ts:3

• Add unit tests covering pluginLazyCompilation to verify that it correctly applies the lazyCompilation experiment when config.dev.lazyCompilation is set.

export const pluginLazyCompilation = (): RsbuildPlugin => ({