[bug]: can not work with vite8

[lisonge]

Describe the bug

    "unplugin-auto-import": "21.0.0",
    "vite": "8.0.0",

// vite.config.ts
import { defineConfig } from 'vite';
import autoImport from 'unplugin-auto-import/vite';

export default defineConfig({
  plugins: [
    autoImport({
      imports: [
        {
          vue: ['h', 'Teleport', 'ref'],
        },
      ],
    }),
  ],
});

// main.ts
export const x = () => {
  const h = 1;
  const Teleport = 1;
};
document.body.innerText = JSON.stringify({
  h: typeof h,
  Teleport: typeof Teleport,
  ref: typeof ref,
});

output

{
    "h": "undefined",
    "Teleport": "undefined",
    "ref": "function"
}

Reproduction

https://stackblitz.com/edit/vitejs-vite-ck7bskoq

System Info

System:
    OS: Windows 11 10.0.26200
    CPU: (32) x64 Intel(R) Core(TM) i9-14900HX
    Memory: 10.67 GB / 31.71 GB
  Binaries:
    Node: 24.8.0 - C:\Users\lisonge\scoop\apps\volta\current\appdata\tools\image\node\24.8.0\node.EXE
    npm: 11.6.0 - C:\Users\lisonge\scoop\apps\volta\current\appdata\tools\image\node\24.8.0\npm.CMD
    pnpm: 10.23.0 - C:\Users\lisonge\scoop\apps\volta\current\appdata\tools\image\pnpm\10.23.0\bin\pnpm.CMD
    Deno: 2.6.6 - C:\Users\lisonge\scoop\shims\deno.EXE
  Browsers:
    Edge: Chromium (143.0.3650.75)
    Internet Explorer: 11.0.26100.7309

Used Package Manager

pnpm

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• The provided reproduction is a minimal reproducible of the bug.

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Start a new pull request in StackBlitz Codeflow.

• vitejs-vite-ck7bskoq (Open reproduction)

[ilyaliao]

I think this comes from the different behavior between Rolldown and esbuild.

Vite 7 (esbuild): esbuild renames h and Teleport to h2 and Teleport2, so unimport’s excludeRE no longer treats them as “already defined.” They stay in the occurrence map and get auto-imported.

Vite 8 (Rolldown): Rolldown keeps the original names. excludeRE matches const h and const Teleport, removes them from the occurrence map, and unimport skips auto-importing them. ref is still imported because it’s never defined locally.

I’m not sure if this is intentional in Rolldown, but I don’t think it’s a bug in unplugin-auto-import.

[lisonge]

I think the scope of unplugin-auto-import is module scope, which should not be affected by locally declared variables with the same name. Essentially, its logic is flawed from the start. It's just that esbuild modifies local variables with the same name, which prematurely masks the issue.

[lisonge]

Hello, what is the current progress? From the perspective of the global scope in TypeScript, this variable is still available. However, due to the presence of a variable with the same name in the local function scope, this plugin does not work in the current file. This results in inconsistent behavior between compile time and runtime. Is this the intended behavior of the plugin?

[ilyaliao]

Sorry, there's very little we can do on our side since this is decided by the upstream. I've already seen a related issue on unimport (unjs/unimport#520), so let's continue tracking this over there.