includeSource

• Type: string[]
• Default: []

A list of glob patterns that match your in-source test files. These patterns are resolved relative to the root (process.cwd() by default).

When defined, Vitest will run all matched files that have import.meta.vitest inside.

WARNING

Vitest performs a simple text-based inclusion check on source files. If a file contains import.meta.vitest, even in a comment, it will be matched as an in-source test file.

Vitest uses the tinyglobby package to resolve the globs.

Example

import { defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    includeSource: ['src/**/*.{js,ts}'],
  },
})

Then you can write tests inside your source files:

src/index.ts

export function add(...args: number[]) {
  return args.reduce((a, b) => a + b, 0)
}

// #region in-source test suites
if (import.meta.vitest) {
  const { it, expect } = import.meta.vitest
  it('add', () => {
    expect(add()).toBe(0)
    expect(add(1)).toBe(1)
    expect(add(1, 2, 3)).toBe(6)
  })
}
// #endregion

For your production build, you need to replace the import.meta.vitest with undefined, letting the bundler do the dead code elimination.

vite.config.ts

import { defineConfig } from 'vite'

export default defineConfig({
  define: { 
    'import.meta.vitest': 'undefined', 
  }, 
})

rolldown.config.js

import { defineConfig } from 'rolldown/config'

export default defineConfig({
  transform: {
    define: { 
      'import.meta.vitest': 'undefined', 
    }, 
  },
})

rollup.config.js

import replace from '@rollup/plugin-replace'

export default {
  plugins: [
    replace({ 
      'import.meta.vitest': 'undefined', 
    }) 
  ],
  // other options
}

build.config.js

import { defineBuildConfig } from 'unbuild'

export default defineBuildConfig({
  replace: { 
    'import.meta.vitest': 'undefined', 
  }, 
  // other options
})

webpack.config.js

const webpack = require('webpack')

module.exports = {
  plugins: [
    new webpack.DefinePlugin({ 
      'import.meta.vitest': 'undefined', 
    })
  ],
}

TIP

To get TypeScript support for import.meta.vitest, add vitest/importMeta to your tsconfig.json:

tsconfig.json

{
  "compilerOptions": {
    "types": ["vitest/importMeta"]
  }
}