tailwindcss/tests/blocklist.test.js

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

crosscheck(({ stable, oxide }) => {
  it('can block classes matched literally', () => {
    let config = {
      content: [
        {
          raw: html`<div
            class="font-bold uppercase sm:hover:text-sm hover:text-sm bg-red-500/50 my-custom-class"
          ></div>`,
        },
      ],
      blocklist: ['font', 'uppercase', 'hover:text-sm', 'bg-red-500/50', 'my-custom-class'],
    }

    let input = css`
      @tailwind utilities;
      .my-custom-class {
        color: red;
      }
    `

    return run(input, config).then((result) => {
      return expect(result.css).toMatchFormattedCss(css`
        .font-bold {
          font-weight: 700;
        }
        .my-custom-class {
          color: red;
        }
        @media (min-width: 640px) {
          .sm\:hover\:text-sm:hover {
            font-size: 0.875rem;
            line-height: 1.25rem;
          }
        }
      `)
    })
  })

  it('can block classes inside @layer', () => {
    let config = {
      content: [
        {
          raw: html`<div class="font-bold my-custom-class"></div>`,
        },
      ],
      blocklist: ['my-custom-class'],
    }

    let input = css`
      @tailwind utilities;
      @layer utilities {
        .my-custom-class {
          color: red;
        }
      }
    `

    return run(input, config).then((result) => {
      return expect(result.css).toMatchFormattedCss(css`
        .font-bold {
          font-weight: 700;
        }
      `)
    })
  })

  it('blocklists do NOT support regexes', async () => {
    let config = {
      content: [{ raw: html`<div class="font-bold bg-[#f00d1e]"></div>` }],
      blocklist: [/^bg-\[[^]+\]$/],
    }

    let result = await run('@tailwind utilities', config)

    stable.expect(result.css).toMatchFormattedCss(css`
      .bg-\[\#f00d1e\] {
        --tw-bg-opacity: 1;
        background-color: rgb(240 13 30 / var(--tw-bg-opacity));
      }
      .font-bold {
        font-weight: 700;
      }
    `)

    oxide.expect(result.css).toMatchFormattedCss(css`
      .bg-\[\#f00d1e\] {
        background-color: #f00d1e;
      }
      .font-bold {
        font-weight: 700;
      }
    `)

    expect().toHaveBeenWarnedWith(['blocklist-invalid'])
  })

  it('can block classes generated by the safelist', () => {
    let config = {
      content: [{ raw: html`<div class="font-bold"></div>` }],
      safelist: [{ pattern: /^bg-red-(400|500)$/ }],
      blocklist: ['bg-red-500'],
    }

    return run('@tailwind utilities', config).then((result) => {
      stable.expect(result.css).toMatchFormattedCss(css`
        .bg-red-400 {
          --tw-bg-opacity: 1;
          background-color: rgb(248 113 113 / var(--tw-bg-opacity));
        }
        .font-bold {
          font-weight: 700;
        }
      `)
      oxide.expect(result.css).toMatchFormattedCss(css`
        .bg-red-400 {
          background-color: #f87171;
        }
        .font-bold {
          font-weight: 700;
        }
      `)
    })
  })
})