tailwindcss/integrations/vite/tests/integration.test.js

require('isomorphic-fetch')

let $ = require('../../execute')
let { css, html, javascript } = require('../../syntax')

let { readOutputFile, appendToInputFile, writeInputFile } = require('../../io')({
  output: 'dist',
  input: '.',
})

let PORT = 1337

async function fetchCSS() {
  let response = await fetch(`http://0.0.0.0:${PORT}/index.css`, {
    headers: {
      Accept: 'text/css',
    },
  })
  return response.text()
}

describe('static build', () => {
  it('should be possible to generate tailwind output', async () => {
    await writeInputFile(
      'index.html',
      html`
        <link rel="stylesheet" href="./index.css" />
        <div class="font-bold"></div>
      `
    )

    await $('vite build', {
      env: { NODE_ENV: 'production' },
    })

    expect(await readOutputFile(/index.\w+\.css$/)).toIncludeCss(
      css`
        .font-bold {
          font-weight: 700;
        }
      `
    )
  })
})

describe('watcher', () => {
  test('classes are generated when the html file changes', async () => {
    await writeInputFile(
      'index.html',
      html`
        <link rel="stylesheet" href="./index.css" />
        <div class="font-bold"></div>
      `
    )

    let runningProcess = $(`vite --port ${PORT}`, {
      env: { TAILWIND_MODE: 'watch' },
    })
    await runningProcess.onStdout((message) => message.includes('ready in'))

    expect(await fetchCSS()).toIncludeCss(
      css`
        .font-bold {
          font-weight: 700;
        }
      `
    )

    await appendToInputFile('index.html', html`<div class="font-normal"></div>`)
    await runningProcess.onStdout((message) => message.includes('hmr update /index.css'))

    expect(await fetchCSS()).toIncludeCss(
      css`
        .font-bold {
          font-weight: 700;
        }
        .font-normal {
          font-weight: 400;
        }
      `
    )

    await appendToInputFile('index.html', html`<div class="bg-red-500"></div>`)
    await runningProcess.onStdout((message) => message.includes('hmr update /index.css'))

    expect(await fetchCSS()).toIncludeCss(
      css`
        .bg-red-500 {
          --tw-bg-opacity: 1;
          background-color: rgba(239, 68, 68, var(--tw-bg-opacity));
        }
        .font-bold {
          font-weight: 700;
        }
        .font-normal {
          font-weight: 400;
        }
      `
    )

    return runningProcess.stop()
  })

  test('classes are generated when the tailwind.config.js file changes', async () => {
    await writeInputFile(
      'index.html',
      html`
        <link rel="stylesheet" href="./index.css" />
        <div class="font-bold md:font-medium"></div>
      `
    )

    let runningProcess = $(`vite --port ${PORT}`, {
      env: { TAILWIND_MODE: 'watch' },
    })
    await runningProcess.onStdout((message) => message.includes('ready in'))

    expect(await fetchCSS()).toIncludeCss(
      css`
        .font-bold {
          font-weight: 700;
        }
        @media (min-width: 768px) {
          .md\\:font-medium {
            font-weight: 500;
          }
        }
      `
    )

    await writeInputFile(
      'tailwind.config.js',
      javascript`
        module.exports = {
          purge: ['./index.html'],
          mode: 'jit',
          darkMode: false, // or 'media' or 'class'
          theme: {
            extend: {
              screens: {
                md: '800px'
              },
              fontWeight: {
                bold: 'bold'
              }
            },
          },
          variants: {
            extend: {},
          },
          corePlugins: {
            preflight: false,
          },
          plugins: [],
        }
      `
    )
    await runningProcess.onStdout((message) => message.includes('hmr update /index.css'))

    expect(await fetchCSS()).toIncludeCss(
      css`
        .font-bold {
          font-weight: bold;
        }
        @media (min-width: 800px) {
          .md\\:font-medium {
            font-weight: 500;
          }
        }
      `
    )

    return runningProcess.stop()
  })

  test('classes are generated when the index.css file changes', async () => {
    await writeInputFile(
      'index.html',
      html`
        <link rel="stylesheet" href="./index.css" />
        <div class="font-bold btn"></div>
      `
    )

    let runningProcess = $(`vite --port ${PORT}`, {
      env: { TAILWIND_MODE: 'watch' },
    })
    await runningProcess.onStdout((message) => message.includes('ready in'))

    expect(await fetchCSS()).toIncludeCss(
      css`
        .font-bold {
          font-weight: 700;
        }
      `
    )

    await writeInputFile(
      'index.css',
      css`
        @tailwind base;
        @tailwind components;
        @tailwind utilities;

        @layer components {
          .btn {
            @apply px-2 py-1 rounded;
          }
        }
      `
    )
    await runningProcess.onStdout((message) => message.includes('hmr update /index.css'))

    expect(await fetchCSS()).toIncludeCss(
      css`
        .btn {
          border-radius: 0.25rem;
          padding-left: 0.5rem;
          padding-right: 0.5rem;
          padding-top: 0.25rem;
          padding-bottom: 0.25rem;
        }
        .font-bold {
          font-weight: 700;
        }
      `
    )

    await writeInputFile(
      'index.css',
      css`
        @tailwind base;
        @tailwind components;
        @tailwind utilities;

        @layer components {
          .btn {
            @apply px-2 py-1 rounded bg-red-500;
          }
        }
      `
    )
    await runningProcess.onStdout((message) => message.includes('hmr update /index.css'))

    expect(await fetchCSS()).toIncludeCss(
      css`
        .btn {
          border-radius: 0.25rem;
          --tw-bg-opacity: 1;
          background-color: rgba(239, 68, 68, var(--tw-bg-opacity));
          padding-left: 0.5rem;
          padding-right: 0.5rem;
          padding-top: 0.25rem;
          padding-bottom: 0.25rem;
        }
        .font-bold {
          font-weight: 700;
        }
      `
    )

    return runningProcess.stop()
  })
})