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fix(plugin-less): parallelLoader config is no longer needed in Rspack v2#7166

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chenjiahan merged 1 commit intomainfrom
less_parallel_0209
Feb 9, 2026
Merged

fix(plugin-less): parallelLoader config is no longer needed in Rspack v2#7166
chenjiahan merged 1 commit intomainfrom
less_parallel_0209

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Summary

The experiments.parallelLoader config is no longer needed in Rspack v2.

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Checklist

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

Copilot AI review requested due to automatic review settings February 9, 2026 06:39
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Summary of Changes

Hello @chenjiahan, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the plugin-less package to ensure compatibility with Rspack v2. It specifically addresses a change in Rspack's configuration requirements, preventing the application of an unnecessary parallelLoader setting for newer versions, thereby streamlining the build process.

Highlights

  • Rspack v2 Compatibility: The experiments.parallelLoader configuration is now conditionally applied, only being enabled for Rspack v1, as it is no longer required in Rspack v2. This prevents unnecessary configuration for newer Rspack versions.
Changelog
  • packages/plugin-less/src/index.ts
    • Modified the conditional logic for applying experiments.parallelLoader to only enable it when parallel is true AND the Rspack version is v1, aligning with Rspack v2's updated configuration needs.
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  • The pull request was created by chenjiahan.
  • No human activity (comments, reviews) has occurred yet.
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Pull request overview

Updates @rsbuild/plugin-less to avoid setting the deprecated/unnecessary experiments.parallelLoader flag when running on Rspack v2 (Rsbuild v2+), while preserving the legacy behavior for Rsbuild v1.

Changes:

  • Gate chain.experiments({ parallelLoader: true }) behind an isV1 check.
  • Add an inline comment explaining why the experiments flag is no longer applied for newer versions.
Comments suppressed due to low confidence (1)

packages/plugin-less/src/index.ts:294

  • This change alters behavior when pluginLess({ parallel: true }) is used: Rsbuild v2+ will no longer set experiments.parallelLoader. There are snapshot tests for this plugin but none covering the parallel option; please add a test that asserts the experiments config differs between Rsbuild v1 and v2 when parallel is enabled to prevent regressions.
      // `experiments.parallelLoader` is no longer required in Rspack 2.0+
      if (parallel && isV1) {
        chain.experiments({
          ...chain.get('experiments'),
          parallelLoader: true,
        });
      }

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Code Review

This pull request updates the less plugin to conditionally apply the parallelLoader configuration. The change correctly identifies that this configuration is no longer needed in newer Rspack versions. My review includes a suggestion to make the version check more robust by inspecting the Rspack version directly, rather than relying on the Rsbuild version as a proxy. This will improve the long-term maintainability of the code.

@chenjiahan chenjiahan merged commit 10ed5f5 into main Feb 9, 2026
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@chenjiahan chenjiahan deleted the less_parallel_0209 branch February 9, 2026 06:56
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