tailwindcss/tests/custom-extractors.test.js

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

function customExtractor(content) {
  let matches = content.match(/class="([^"]+)"/)
  return matches ? matches[1].split(/\s+/) : []
}

let sharedHtml = html`
  <div class="text-indigo-500 bg-white">hello world</div>
  <span>text-red-500 shouldn't appear in the output</span>
`

let expected = css`
  .bg-white {
    --tw-bg-opacity: 1;
    background-color: rgb(255 255 255 / var(--tw-bg-opacity));
  }
  .text-indigo-500 {
    --tw-text-opacity: 1;
    color: rgb(99 102 241 / var(--tw-text-opacity));
  }
`

describe('modern', () => {
  test('extract.DEFAULT', () => {
    let config = {
      content: {
        files: [{ raw: sharedHtml }],
        extract: {
          DEFAULT: customExtractor,
        },
      },
    }

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

  test('extract.{extension}', () => {
    let config = {
      content: {
        files: [{ raw: sharedHtml }],
        extract: {
          html: customExtractor,
        },
      },
    }

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

  test('extract function', () => {
    let config = {
      content: {
        files: [{ raw: sharedHtml }],
        extract: customExtractor,
      },
    }

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

  test('raw content with extension', () => {
    let config = {
      content: {
        files: [
          {
            raw: sharedHtml,
            extension: 'html',
          },
        ],
        extract: {
          html: () => ['invisible'],
        },
      },
      corePlugins: { preflight: false },
    }

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

describe('legacy', () => {
  test('defaultExtractor', () => {
    let config = {
      content: {
        files: [{ raw: sharedHtml }],
        options: {
          defaultExtractor: customExtractor,
        },
      },
    }

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

  test('extractors array', () => {
    let config = {
      content: {
        files: [{ raw: sharedHtml }],
        options: {
          extractors: [
            {
              extractor: customExtractor,
              extensions: ['html'],
            },
          ],
        },
      },
    }

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