Repository: vitejs/vite
File: playground/lib/__tests__/lib.spec.ts (TypeScript)

Code before:
    expect(iife).toMatch('process.env.NODE_ENV')
    expect(umd).toMatch('process.env.NODE_ENV')
  })

  test('terser minification for es lib mode', () => {
    const terserEs = readFile('dist/terser/my-lib-custom-filename.js')

    // Should not contain console.log since drop_console is true
    expect(terserEs).not.toMatch('console.log')

    // Should be minified - contains function but no excessive whitespace/newlines
    expect(terserEs).toMatch(/function/)

    // Should be minified (very compact, less than 5 lines)
    expect(terserEs.split('\n').length).toBeLessThan(5)
  })

  test('pure annotations respected by terser for tree-shaking', () => {
    const terserEs = readFile('dist/terser/my-lib-custom-filename.js')

    // createObject function should be included (not tree-shaken) since it's used
    expect(terserEs).toMatch(/created.*Date\.now/)

    // The pure annotation should work functionally - terser should respect it for optimization
    // This verifies the pure annotation mechanism is working correctly
    expect(terserEs).toMatch(/function/)
  })

  test('single entry with css', () => {
    const css = readFile('dist/css-single-entry/test-my-lib.css')
    const js = readFile('dist/css-single-entry/test-my-lib.js')
    const umd = readFile('dist/css-single-entry/test-my-lib.umd.cjs')
    expect(css).toMatch('entry-1.css')
    expect(js).toMatch('css-entry-1')
    expect(umd).toContain('css-entry-1')
  })

  test('multi entry with css', () => {
    const css = readFile('dist/css-multi-entry/test-my-lib.css')
    const js1 = readFile('dist/css-multi-entry/css-entry-1.js')
    const js2 = readFile('dist/css-multi-entry/css-entry-2.js')
    const cjs1 = readFile('dist/css-multi-entry/css-entry-1.cjs')
    const cjs2 = readFile('dist/css-multi-entry/css-entry-2.cjs')
    expect(css).toMatch('entry-1.css')
    expect(css).toMatch('entry-2.css')
    expect(js1).toMatch('css-entry-1')
    expect(js2).toMatch('css-entry-2')
    expect(cjs1).toContain('css-entry-1')
    expect(cjs2).toContain('css-entry-2')
  })


Review comment (suggestion):
```suggestion
    const terserEs = readFile('dist/terser/my-lib-custom-filename.js')
    expect(terserEs).toMatch(/[#@]__PURE__/)
```

Code after:
    expect(iife).toMatch('process.env.NODE_ENV')
    expect(umd).toMatch('process.env.NODE_ENV')
  })

  test('debugger statements are removed by terser for es', () => {
    const terserEs = readFile('dist/terser/my-lib-custom-filename.js')
    expect(terserEs).not.toMatch('debugger')
  })

  test('pure annotations are not removed by terser for es', () => {
    const terserEs = readFile('dist/terser/my-lib-custom-filename.js')
    expect(terserEs).toMatch(/[@#]__PURE__/)
  })

  test('pure annotations are removed by terser for non-es output', () => {
    const terserIife = readFile('dist/terser/my-lib-custom-filename.iife.js')
    expect(terserIife).not.toMatch(/[@#]__PURE__/)
  })

  test('single entry with css', () => {
    const css = readFile('dist/css-single-entry/test-my-lib.css')
    const js = readFile('dist/css-single-entry/test-my-lib.js')
    const umd = readFile('dist/css-single-entry/test-my-lib.umd.cjs')
    expect(css).toMatch('entry-1.css')
    expect(js).toMatch('css-entry-1')
    expect(umd).toContain('css-entry-1')
  })

  test('multi entry with css', () => {
    const css = readFile('dist/css-multi-entry/test-my-lib.css')
    const js1 = readFile('dist/css-multi-entry/css-entry-1.js')
    const js2 = readFile('dist/css-multi-entry/css-entry-2.js')
    const cjs1 = readFile('dist/css-multi-entry/css-entry-1.cjs')
    const cjs2 = readFile('dist/css-multi-entry/css-entry-2.cjs')
    expect(css).toMatch('entry-1.css')
    expect(css).toMatch('entry-2.css')
    expect(js1).toMatch('css-entry-1')
    expect(js2).toMatch('css-entry-2')
    expect(cjs1).toContain('css-entry-1')
    expect(cjs2).toContain('css-entry-2')
  })

  test('multi entry with css and code split', () => {
    const css1 = readFile('dist/css-code-split/css-entry-1.css')
    const css2 = readFile('dist/css-code-split/css-entry-2.css')
    const js1 = readFile('dist/css-code-split/css-entry-1.js')
    const js2 = readFile('dist/css-code-split/css-entry-2.js')
    const cjs1 = readFile('dist/css-code-split/css-entry-1.cjs')
    const cjs2 = readFile('dist/css-code-split/css-entry-2.cjs')
    expect(css1).toMatch('entry-1.css')
    expect(css2).toMatch('entry-2.css')