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User code:

import styles from '@/index.less';

styles;

alias config:

alias: {
  '@/*': './intput/*'
}

Before:

import style from '@/index.less'
    ↓ (transform add `?modules`)
'@/index.less?modules'
    ↓ (alias resolve,query lost)
'./input/index.less'  ← without query `?modules`, lightningcss doesn't deal css as css modules

style = void 0  ❌

After:

import style from '@/index.less'
    ↓ (transform add `?modules`)
'@/index.less?modules'
    ↓ (alias resolve,query keep)
'./input/index.less?modules'`?modules` keep
    ↓
style = { nav: "index-less__xxx__nav" }  ✅

@gemini-code-assist
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Summary of Changes

Hello @fireairforce, 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 resolves a critical bug in Turbopack's alias resolution logic. Previously, any query parameters appended to an import request were inadvertently dropped when an alias was applied. This behavior prevented modules that rely on these parameters, such as CSS modules using ?modules, from being correctly processed. The change ensures that query parameters are now consistently retained throughout the alias resolution process, leading to correct module interpretation and functionality.

Highlights

  • Alias Resolution: Fixed an issue where query parameters (e.g., ?modules) were lost during alias resolution, ensuring they are now correctly preserved.
  • CSS Modules Support: This fix specifically addresses a problem where CSS modules were not being processed correctly due to the loss of the ?modules query parameter during alias resolution.
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Code Review

This pull request addresses an issue where query parameters were being dropped during alias resolution in Turbopack. The fix involves preserving the query string from the original import and applying it to the request generated from the alias. This is a good, targeted fix for the described problem, especially important for features like CSS modules which rely on query parameters. The implementation is clear, idiomatic, and appears correct.

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May post to upstream.

@xusd320 xusd320 merged commit 9911883 into utoo Jan 22, 2026
12 of 25 checks passed
@fireairforce
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May post to upstream.

yes, i am writing test case now

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3 participants