Astro typecheck prevents astro components from being loaded

Describe the bug

I've created an astro project with basic vite configuration:

/// <reference types="vitest" />
import { getViteConfig } from 'astro/config';
import tsconfigPaths from 'vite-tsconfig-paths';

export default getViteConfig({
  plugins: [tsconfigPaths()],
  // @ts-expect-error - Vitest config is merged
  test: {
    include: ['tests/**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}'],
    typecheck: {
      enabled: true,
      checker: 'tsc',
      include: ['tests/**/*.{test,spec}-d.{ts,mts,cts}'],
    },
  },
});

I've created a polymorphic component and testing for the tests:

import type { ComponentProps, HTMLTag } from 'astro/types';
import { expectTypeOf, test } from 'vitest';
import type Polymorphic from '@/components/html/_polymorphic.astro';

test('Polymorphic types', () => {
  type PolymorphicProps<Tag extends HTMLTag> = ComponentProps<
    typeof Polymorphic<Tag>
  >;
  type ButtonProps = PolymorphicProps<'button'>;

  expectTypeOf<ButtonProps['as']>().toEqualTypeOf<'button' | undefined>();

  // Check specific attributes
  type AnchorProps = PolymorphicProps<'a'>;
  expectTypeOf<AnchorProps['as']>().toEqualTypeOf<'a' | undefined>();

  // href should exist on anchor
  expectTypeOf<AnchorProps['href']>().not.toBeNever();

  // Test invalid usage
  // @ts-expect-error - 'href' is not valid on button (if strict)
  const _: ButtonProps = { as: 'button', href: 'bad' };
});

I'm receiving:

 ❯  TS  tests/html/_polymorphic.test-d.ts (1 test | 1 failed)
   × Polymorphic types

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Failed Tests 1 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
 FAIL  tests/html/_polymorphic.test-d.ts > Polymorphic types
TypeCheckError: Cannot find module '@/components/html/_polymorphic.astro' or its corresponding type declarations.
 ❯ tests/html/_polymorphic.test-d.ts:3:30
      1| import type { ComponentProps, HTMLTag } from 'astro/types';
      2| import { expectTypeOf, test } from 'vitest';
      3| import type Polymorphic from '@/components/html/_polymorphic.astro';
       |                              ^
      4| 
      5| test('Polymorphic types', () => {

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[1/1]⎯

Reproduction

Generally doesn't matter any import of an astro component inside vite causes this. Whilst astro check with the plugin works. Maybe astro needs a plugin but the issue is the difference that was being created.

System Info

System:
    OS: Linux 6.18 Arch Linux
    CPU: (20) x64 12th Gen Intel(R) Core(TM) i7-12700H
    Memory: 53.10 GB / 62.50 GB
    Container: Yes
    Shell: 5.9 - /usr/bin/zsh
  Binaries:
    Node: 24.11.0 - /home/sagi/.local/share/mise/installs/node/24.11.0/bin/node
    Yarn: 1.22.22 - /usr/bin/yarn
    npm: 11.6.1 - /home/sagi/.local/share/mise/installs/node/24.11.0/bin/npm
    pnpm: 10.27.0 - /home/sagi/.local/share/pnpm/pnpm
    bun: 1.3.1 - /home/sagi/.local/share/mise/installs/bun/1.3.1/bin/bun
  Browsers:
    Chromium: 143.0.7499.109
    Firefox: 146.0.1
    Firefox Developer Edition: 146.0.1
  npmPackages:
    vitest: ^4.0.16 => 4.0.16

Used Package Manager

npm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• 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 open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

Start with the shown getViteConfig setup and the failing tests/html/_polymorphic.test-d.ts import of the Astro component. Compare Vitest's typecheck behavior with the Astro check/plugin path that reportedly works. Done means Astro component imports resolve during Vitest typecheck without the reported module error.