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

import postcss from 'postcss'
import fs from 'fs'
import path from 'path'
import tailwind from '../../src/jit/index.js'

function run(input, config = {}) {
  return postcss(tailwind(config)).process(input, {
    from: path.resolve(__filename),
  })
}

test('custom separator', () => {
  let config = {
    darkMode: 'class',
    mode: 'jit',
    purge: [path.resolve(__dirname, './custom-separator.test.html')],
    separator: '_',
    corePlugins: {},
    theme: {},
    plugins: [],
  }

  let css = `@tailwind utilities`

  return run(css, config).then((result) => {
    let expectedPath = path.resolve(__dirname, './custom-separator.test.css')
    let expected = fs.readFileSync(expectedPath, 'utf8')

    expect(result.css).toMatchFormattedCss(expected)
  })
})

test('dash is not supported', () => {
  let config = {
    darkMode: 'class',
    mode: 'jit',
    purge: [{ raw: 'lg-hover-font-bold' }],
    separator: '-',
    corePlugins: {},
    theme: {},
    plugins: [],
  }

  let css = `@tailwind utilities`

  return expect(run(css, config)).rejects.toThrowError(
    "The '-' character cannot be used as a custom separator in JIT mode due to parsing ambiguity. Please use another character like '_' instead."
  )
})