tailwindcss/tests/dark-mode.test.js

import { run, html, css, defaults } from './util/run'

it('should be possible to use the darkMode "class" mode', () => {
  let config = {
    darkMode: 'class',
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind base;
    @tailwind components;
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      ${defaults}
      :is(:where(.dark) .dark\:font-bold) {
        font-weight: 700;
      }
    `)
  })
})

it('should be possible to change the class name', () => {
  let config = {
    darkMode: ['class', '.test-dark'],
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind base;
    @tailwind components;
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      ${defaults}
      :is(:where(.test-dark) .dark\:font-bold) {
        font-weight: 700;
      }
    `)
  })
})

it('should be possible to use the darkMode "media" mode', () => {
  let config = {
    darkMode: 'media',
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind base;
    @tailwind components;
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      ${defaults}
      @media (prefers-color-scheme: dark) {
        .dark\:font-bold {
          font-weight: 700;
        }
      }
    `)
  })
})

it('should default to the `media` mode when no mode is provided', () => {
  let config = {
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind base;
    @tailwind components;
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      ${defaults}
      @media (prefers-color-scheme: dark) {
        .dark\:font-bold {
          font-weight: 700;
        }
      }
    `)
  })
})

it('should default to the `media` mode when mode is set to `false`', () => {
  let config = {
    darkMode: false,
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind base;
    @tailwind components;
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      ${defaults}
      @media (prefers-color-scheme: dark) {
        .dark\:font-bold {
          font-weight: 700;
        }
      }
    `)
  })
})

it('should support legacy dark mode behavior', () => {
  let config = {
    darkMode: 'legacy',
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      :is(.dark .dark\:font-bold) {
        font-weight: 700;
      }
    `)
  })
})

it('should support custom classes with legacy dark mode', () => {
  let config = {
    darkMode: ['legacy', '.my-dark'],
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      :is(.my-dark .dark\:font-bold) {
        font-weight: 700;
      }
    `)
  })
})

it('should use legacy sorting when using darkMode: legacy', () => {
  let config = {
    darkMode: 'legacy',
    content: [{ raw: html`<div class="dark:text-green-100  hover:text-green-200 lg:text-green-300"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .hover\:text-green-200:hover {
        --tw-text-opacity: 1;
        color: rgb(187 247 208 / var(--tw-text-opacity));
      }
      :is(.dark .dark\:text-green-100) {
        --tw-text-opacity: 1;
        color: rgb(220 252 231 / var(--tw-text-opacity));
      }
      @media (min-width: 1024px) {
        .lg\:text-green-300 {
          --tw-text-opacity: 1;
          color: rgb(134 239 172 / var(--tw-text-opacity));
        }
      }
    `)
  })
})

it('should use modern sorting otherwise', () => {
  let config = {
    darkMode: 'class',
    content: [{ raw: html`<div class="dark:text-green-100  hover:text-green-200 lg:text-green-300"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .hover\:text-green-200:hover {
        --tw-text-opacity: 1;
        color: rgb(187 247 208 / var(--tw-text-opacity));
      }
      @media (min-width: 1024px) {
        .lg\:text-green-300 {
          --tw-text-opacity: 1;
          color: rgb(134 239 172 / var(--tw-text-opacity));
        }
      }
      :is(:where(.dark) .dark\:text-green-100) {
        --tw-text-opacity: 1;
        color: rgb(220 252 231 / var(--tw-text-opacity));
      }
    `)
  })
})

it('should allow customization of the dark mode variant', () => {
  let config = {
    darkMode: ['variant', '&:not(.light *)'],
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .dark\:font-bold:not(.light *) {
        font-weight: 700;
      }
    `)
  })
})

it('should support parallel selectors for the dark mode variant', () => {
  let config = {
    darkMode: ['variant', ['&:not(.light *)', '&:not(.extralight *)']],
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .dark\:font-bold:not(.light *),
      .dark\:font-bold:not(.extralight *) {
        font-weight: 700;
      }
    `)
  })
})

it('should support fn selectors for the dark mode variant', () => {
  let config = {
    darkMode: ['variant', () => ['&:not(.light *)', '&:not(.extralight *)']],
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .dark\:font-bold:not(.light *),
      .dark\:font-bold:not(.extralight *) {
        font-weight: 700;
      }
    `)
  })
})