tailwindcss/tests/jit/custom-extractors.test.js

import postcss from 'postcss'
import fs from 'fs'
import path from 'path'

function run(input, config = {}) {
  jest.resetModules()
  const tailwind = require('../../src/jit/index.js').default
  return postcss(tailwind(config)).process(input, {
    from: path.resolve(__filename),
  })
}

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

const css = `
  @tailwind base;
  @tailwind components;
  @tailwind utilities;
`
const expectedPath = path.resolve(__dirname, './custom-extractors.test.css')
const expected = fs.readFileSync(expectedPath, 'utf8')

test('defaultExtractor', () => {
  let config = {
    mode: 'jit',
    purge: {
      content: [path.resolve(__dirname, './custom-extractors.test.html')],
      options: {
        defaultExtractor: customExtractor,
      },
    },
    corePlugins: { preflight: false },
    theme: {},
    plugins: [],
  }

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

test('extractors array', () => {
  let config = {
    purge: {
      content: [path.resolve(__dirname, './custom-extractors.test.html')],
      options: {
        extractors: [
          {
            extractor: customExtractor,
            extensions: ['html'],
          },
        ],
      },
    },
    mode: 'jit',
    corePlugins: { preflight: false },
    theme: {},
    plugins: [],
  }

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