tailwindcss/tests/color-opacity-modifiers.test.js

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

test('basic color opacity modifier', async () => {
  let config = {
    content: [{ raw: html`<div class="bg-red-500/50"></div>` }],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .bg-red-500\/50 {
        background-color: rgb(239 68 68 / 0.5);
      }
    `)
  })
})

test('colors with slashes are matched first', async () => {
  let config = {
    content: [{ raw: html`<div class="bg-red-500/50"></div>` }],
    theme: {
      extend: {
        colors: {
          'red-500/50': '#ff0000',
        },
      },
    },
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .bg-red-500\/50 {
        --tw-bg-opacity: 1;
        background-color: rgb(255 0 0 / var(--tw-bg-opacity));
      }
    `)
  })
})

test('arbitrary color opacity modifier', async () => {
  let config = {
    content: [{ raw: html`<div class="bg-red-500/[var(--opacity)]"></div>` }],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .bg-red-500\/\[var\(--opacity\)\] {
        background-color: rgb(239 68 68 / var(--opacity));
      }
    `)
  })
})

test('missing alpha generates nothing', async () => {
  let config = {
    content: [{ raw: html`<div class="bg-red-500/"></div>` }],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(``)
  })
})

test('arbitrary color with opacity from scale', async () => {
  let config = {
    content: [{ raw: 'bg-[wheat]/50' }],
    theme: {},
    plugins: [],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .bg-\[wheat\]\/50 {
        background-color: rgb(245 222 179 / 0.5);
      }
    `)
  })
})

test('arbitrary color with arbitrary opacity', async () => {
  let config = {
    content: [{ raw: 'bg-[#bada55]/[0.2]' }],
    theme: {},
    plugins: [],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .bg-\[\#bada55\]\/\[0\.2\] {
        background-color: rgb(186 218 85 / 0.2);
      }
    `)
  })
})

test('undefined theme color with opacity from scale', async () => {
  let config = {
    content: [{ raw: 'bg-garbage/50' }],
    theme: {},
    plugins: [],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(``)
  })
})

test('values not in the opacity config are ignored', async () => {
  let config = {
    content: [{ raw: html`<div class="bg-red-500/29"></div>` }],
    theme: {
      opacity: {
        0: '0',
        25: '0.25',
        5: '0.5',
        75: '0.75',
        100: '1',
      },
    },
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(``)
  })
})

test('function colors are supported', async () => {
  let config = {
    content: [{ raw: html`<div class="bg-blue/50"></div>` }],
    theme: {
      colors: {
        blue: ({ opacityValue }) => {
          return `rgba(var(--colors-blue), ${opacityValue})`
        },
      },
    },
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .bg-blue\/50 {
        background-color: rgba(var(--colors-blue), 0.5);
      }
    `)
  })
})

test('utilities that support any type are supported', async () => {
  let config = {
    content: [
      {
        raw: html`
          <div class="from-red-500/50"></div>
          <div class="fill-red-500/25"></div>
          <div class="placeholder-red-500/75"></div>
        `,
      },
    ],
    theme: {
      extend: {
        fill: (theme) => theme('colors'),
      },
    },
    plugins: [],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .from-red-500\/50 {
        --tw-gradient-from: rgb(239 68 68 / 0.5);
        --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgb(239 68 68 / 0));
      }
      .fill-red-500\/25 {
        fill: rgb(239 68 68 / 0.25);
      }
      .placeholder-red-500\/75::placeholder {
        color: rgb(239 68 68 / 0.75);
      }
    `)
  })
})