[Bug]: vitest fails on geting the config dir in Windows

[SalahAdDin]

Describe the bug

When we try to run the tests, it breaks with the following issue:

dirname: G:\Projects\sites\central-mosque-bogota\frontend G:\Projects\sites\central-mosque-bogota\frontend G:\Projects\sites\central-mosque-bogota\frontend\.storybook
│
▲  No story files found for the specified pattern: src\**\*.mdx
dirname: G:\Projects\sites\central-mosque-bogota\frontend G:\Projects\sites\central-mosque-bogota\frontend G:\Projects\sites\central-mosque-bogota\frontend\.storybook
dirname: G:\Projects\sites\central-mosque-bogota\frontend G:\Projects\sites\central-mosque-bogota\frontend G:\Projects\sites\central-mosque-bogota\frontend\.storybook

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Startup Error ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
AggregateError: Failed to initialize projects. There were errors during projects setup. See below for more details.
    at resolveProjects (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cli-api.Bxr1Nn49.js:11147:27)
    at Vitest._setServer (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cli-api.Bxr1Nn49.js:13128:20)
    at BasicMinimalPluginContext.handler (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cli-api.Bxr1Nn49.js:14127:5)
    at _createServer (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vite@7.3.1_@types+node@25.5_d593e592f2c5ffb07d977b636d83184a/node_modules/vite/dist/node/chunks/config.js:25603:86)
    at createViteServer (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cli-api.Bxr1Nn49.js:8820:17)
    at createVitest (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cli-api.Bxr1Nn49.js:14161:18)
    at prepareVitest (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cli-api.Bxr1Nn49.js:14528:14)
    at startVitest (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cli-api.Bxr1Nn49.js:14471:14)
    at start (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cac.DRKYQDPl.js:2328:15) {
  [errors]: [
    TypeError: The URL must be of scheme file
        at fileURLToPath (node:internal/url:1608:11)
        at file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/@storybook+addon-vitest@10._5bf1baf61ad87163f31bfb8f4422c6f7/node_modules/@storybook/addon-vitest/dist/vitest-plugin/index.js:2526:43
        at Array.map (<anonymous>)
        at BasicMinimalPluginContext.config (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/@storybook+addon-vitest@10._5bf1baf61ad87163f31bfb8f4422c6f7/node_modules/@storybook/addon-vitest/dist/vitest-plugin/index.js:2526:25)
        at runConfigHook (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vite@7.3.1_@types+node@25.5_d593e592f2c5ffb07d977b636d83184a/node_modules/vite/dist/node/chunks/config.js:35936:15)
        at resolveConfig (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vite@7.3.1_@types+node@25.5_d593e592f2c5ffb07d977b636d83184a/node_modules/vite/dist/node/chunks/config.js:35438:13)
        at _createServer (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vite@7.3.1_@types+node@25.5_d593e592f2c5ffb07d977b636d83184a/node_modules/vite/dist/node/chunks/config.js:25362:67)
        at createViteServer (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cli-api.Bxr1Nn49.js:8820:17)
        at initializeProject (file:///G:/Projects/sites/central-mosque-bogota/frontend/node_modules/.pnpm/vitest@4.1.2_@types+node@25_b9542e0439b0b4b9512483fb4c3e3fec/node_modules/vitest/dist/chunks/cli-api.Bxr1Nn49.js:11033:2)
        at async Promise.allSettled (index 1) {
      code: 'ERR_INVALID_URL_SCHEME'
    }
  ]
}

We have the following test configuration:

import { storybookTest } from "@storybook/addon-vitest/vitest-plugin";
import { playwright } from "@vitest/browser-playwright";
import { getViteConfig } from "astro/config";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { coverageConfigDefaults } from "vitest/config";

const dirname =
  typeof __dirname !== "undefined"
    ? __dirname
    : path.dirname(fileURLToPath(import.meta.url));

export default getViteConfig({
  build: {
    rollupOptions: {
      output: {
        banner:
          "/* ﷽ - In the name of Allah, the Most Gracious, the Most Merciful */",
      },
    },
  },
  test: {
    globals: true,
    css: true,
    clearMocks: true,
    restoreMocks: true,
    passWithNoTests: true,
    coverage: {
      exclude: [...coverageConfigDefaults.exclude],
      provider: "v8",
      reporter: ["html", "verbose"],
      thresholds: {
        branches: 90,
        functions: 95,
        lines: 80,
        statements: 80,
      },
    },
    projects: [
      {
        extends: true,
        test: {
          name: "unit",
          include: ["src/**/*.{test,spec}.{astro,js,jsx,ts,tsx}"],
          exclude: ["tests"],
          environment: "node",
          setupFiles: ["./src/vitest.setup.ts"],
        },
      },
      {
        extends: true,
        plugins: [
          storybookTest({
            configDir: path.join(dirname, ".storybook"),
            storybookScript: "pnpm storybook --no-open",
          }),
        ],
        test: {
          name: "storybook",
          browser: {
            enabled: true,
            headless: true,
            provider: playwright({}),
            instances: [
              {
                browser: "chromium",
              },
            ],
          },
        },
      },
    ],
  },
});

As you see in the logs, __dirname is defined, as well as the config directory, but vitest fails to run cause in this addon fails, and it seems to happen on Windows.

Reproduction link

https://github.com/SalahAdDin/central-mosque-bogota/tree/main/frontend

Reproduction steps

1. Set up the project.
2. Configure the tests with Vitest.
3. Install Storybook.
4. Configure it.
5. Install the Vitest addon.
6. Add addon configuration to the tests.
7. Run the tests.

System

│
│  
│  Storybook Environment Info:
│

│  System:
│  OS: Windows 11 10.0.26200
│  CPU: (32) x64 Intel(R) Core(TM) i9-14900HX
│  Binaries:
│  Node: 24.13.1 -
│  C:\Users\alagu\AppData\Local\fnm_multishells\69064_1774906487606\node.EXE
│  npm: 11.8.0 -
│  C:\Users\alagu\AppData\Local\fnm_multishells\69064_1774906487606\npm.CMD
│  pnpm: 10.33.0 -
│  C:\Users\alagu\AppData\Local\fnm_multishells\69064_1774906487606\pnpm.CMD <-----
│  active
│  Browsers:
│  Edge: Chromium (140.0.3485.54)
│  npmPackages:
│  @storybook/addon-a11y: 10.3.3 => 10.3.3
│  @storybook/addon-designs: 11.1.3 => 11.1.3
│  @storybook/addon-docs: 10.3.3 => 10.3.3
│  @storybook/addon-themes: 10.3.3 => 10.3.3
│  @storybook/addon-vitest: 10.3.3 => 10.3.3
│  @storybook/builder-vite: 10.3.3 => 10.3.3
│  eslint-plugin-storybook: 10.3.3 => 10.3.3
│  storybook: 10.3.3 => 10.3.3
│  storybook-addon-rtl: 3.0.1 => 3.0.1
│  storybook-addon-tag-badges: 3.1.0 => 3.1.0

Additional context

We are using Storybook in an Astro project.

[dosubot]

This matches a bug tracked in #34256 [1]. The root cause is that @storybook/addon-vitest's vitest plugin passes raw absolute Windows paths (like G:\Projects\...\.storybook\preview.ts) through import.meta.resolve(), which only accepts bare module specifiers or file:// URLs — not raw filesystem paths. This causes the ERR_INVALID_URL_SCHEME error [2].

PR #34361 removes the problematic code path entirely, but it hasn't been merged yet [3].

Workaround until a fix ships: You can patch @storybook/addon-vitest locally. In the built file (node_modules/@storybook/addon-vitest/dist/vitest-plugin/index.js), find the .map call around line 2526 that does fileURLToPath(import.meta.resolve(filePath)) and replace it with:

.map((filePath) => {
  const path = require('node:path');
  if (path.isAbsolute(filePath)) {
    return filePath;
  }
  return fileURLToPath(import.meta.resolve(filePath));
})

If you're using pnpm, you can apply this more durably via pnpm patch.

To reply, just mention @dosu.

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