tailwindcss/tests/collapse-adjacent-rules.test.js

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

crosscheck(() => {
  test('collapse adjacent rules', () => {
    let config = {
      content: [
        {
          raw: html`
            <div class="custom-component"></div>
            <div class="sm:custom-component"></div>
            <div class="md:custom-component"></div>
            <div class="lg:custom-component"></div>
            <div class="font-bold"></div>
            <div class="sm:font-bold"></div>
            <div class="sm:text-center"></div>
            <div class="md:font-bold"></div>
            <div class="md:text-center"></div>
            <div class="lg:font-bold"></div>
            <div class="lg:text-center"></div>
            <div class="some-apply-thing"></div>
          `,
        },
      ],
      corePlugins: { preflight: false },
      theme: {},
      plugins: [
        function ({ addVariant }) {
          addVariant('foo-bar', '@supports (foo: bar)')
        },
      ],
    }

    let input = css`
      @tailwind base;
      @font-face {
        font-family: 'Inter';
        src: url('/fonts/Inter.woff2') format('woff2'), url('/fonts/Inter.woff') format('woff');
      }
      @font-face {
        font-family: 'Gilroy';
        src: url('/fonts/Gilroy.woff2') format('woff2'), url('/fonts/Gilroy.woff') format('woff');
      }
      @page {
        margin: 1cm;
      }
      @tailwind components;
      @tailwind utilities;
      @layer base {
        @font-face {
          font-family: 'Poppins';
          src: url('/fonts/Poppins.woff2') format('woff2'),
            url('/fonts/Poppins.woff') format('woff');
        }
        @font-face {
          font-family: 'Proxima Nova';
          src: url('/fonts/ProximaNova.woff2') format('woff2'),
            url('/fonts/ProximaNova.woff') format('woff');
        }
      }
      .foo,
      .bar {
        color: black;
      }
      .foo,
      .bar {
        font-weight: 700;
      }
      .some-apply-thing {
        @apply foo-bar:md:text-black foo-bar:md:font-bold foo-bar:text-black foo-bar:font-bold md:font-bold md:text-black;
      }
    `

    return run(input, config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        @font-face {
          font-family: Poppins;
          src: url('/fonts/Poppins.woff2') format('woff2'),
            url('/fonts/Poppins.woff') format('woff');
        }
        @font-face {
          font-family: Proxima Nova;
          src: url('/fonts/ProximaNova.woff2') format('woff2'),
            url('/fonts/ProximaNova.woff') format('woff');
        }
        ${defaults}
        @font-face {
          font-family: Inter;
          src: url('/fonts/Inter.woff2') format('woff2'), url('/fonts/Inter.woff') format('woff');
        }
        @font-face {
          font-family: Gilroy;
          src: url('/fonts/Gilroy.woff2') format('woff2'), url('/fonts/Gilroy.woff') format('woff');
        }
        @page {
          margin: 1cm;
        }
        .font-bold {
          font-weight: 700;
        }
        .foo,
        .bar {
          color: #000;
          font-weight: 700;
        }
        @supports (foo: bar) {
          .some-apply-thing {
            --tw-text-opacity: 1;
            color: rgb(0 0 0 / var(--tw-text-opacity));
            font-weight: 700;
          }
        }
        @media (min-width: 768px) {
          .some-apply-thing {
            --tw-text-opacity: 1;
            color: rgb(0 0 0 / var(--tw-text-opacity));
            font-weight: 700;
          }
        }
        @supports (foo: bar) {
          @media (min-width: 768px) {
            .some-apply-thing {
              --tw-text-opacity: 1;
              color: rgb(0 0 0 / var(--tw-text-opacity));
              font-weight: 700;
            }
          }
        }
        @media (min-width: 640px) {
          .sm\:text-center {
            text-align: center;
          }
          .sm\:font-bold {
            font-weight: 700;
          }
        }
        @media (min-width: 768px) {
          .md\:text-center {
            text-align: center;
          }
          .md\:font-bold {
            font-weight: 700;
          }
        }
        @media (min-width: 1024px) {
          .lg\:text-center {
            text-align: center;
          }
          .lg\:font-bold {
            font-weight: 700;
          }
        }
      `)
    })
  })

  test('duplicate url imports does not break rule collapsing', () => {
    let config = {
      content: [{ raw: html`` }],
      corePlugins: { preflight: false },
    }

    let input = css`
      @import url('https://example.com');
      @import url('https://example.com');
    `

    return run(input, config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        @import 'https://example.com';
      `)
    })
  })
})