tailwindcss/tests/customConfig.test.js

import fs from 'fs'
import path from 'path'
import inTempDirectory from '../jest/runInTempDirectory'

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

const defaultConfigFile = 'tailwind.config.js'
const cjsConfigFile = 'tailwind.config.cjs'

crosscheck(() => {
  test('it uses the values from the custom config file', () => {
    let config = require(path.resolve(`${__dirname}/fixtures/custom-config.js`))

    return run('@tailwind utilities', config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        @media (min-width: 400px) {
          .mobile\:font-bold {
            font-weight: 700;
          }
        }
      `)
    })
  })

  test('custom config can be passed as an object', () => {
    let config = {
      content: [{ raw: html`<div class="mobile:font-bold"></div>` }],
      theme: {
        screens: {
          mobile: '400px',
        },
      },
    }

    return run('@tailwind utilities', config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        @media (min-width: 400px) {
          .mobile\:font-bold {
            font-weight: 700;
          }
        }
      `)
    })
  })

  test('custom config path can be passed using `config` property in an object', () => {
    let config = {
      config: path.resolve(`${__dirname}/fixtures/custom-config.js`),
    }

    return run('@tailwind utilities', config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        @media (min-width: 400px) {
          .mobile\:font-bold {
            font-weight: 700;
          }
        }
      `)
    })
  })

  test('custom config can be passed under the `config` property', () => {
    let config = {
      config: {
        content: [{ raw: html`<div class="mobile:font-bold"></div>` }],
        theme: {
          screens: {
            mobile: '400px',
          },
        },
      },
    }

    return run('@tailwind utilities', config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        @media (min-width: 400px) {
          .mobile\:font-bold {
            font-weight: 700;
          }
        }
      `)
    })
  })

  test('tailwind.config.cjs is picked up by default', () => {
    return inTempDirectory(() => {
      fs.writeFileSync(
        path.resolve(cjsConfigFile),
        javascript`module.exports = {
        content: [{ raw: '<div class="mobile:font-bold"></div>' }],
        theme: {
          screens: {
            mobile: '400px',
          },
        },
      }`
      )

      return run('@tailwind utilities').then((result) => {
        expect(result.css).toMatchFormattedCss(css`
          @media (min-width: 400px) {
            .mobile\:font-bold {
              font-weight: 700;
            }
          }
        `)
      })
    })
  })

  test('tailwind.config.js is picked up by default', () => {
    return inTempDirectory(() => {
      fs.writeFileSync(
        path.resolve(defaultConfigFile),
        javascript`module.exports = {
        content: [{ raw: '<div class="mobile:font-bold"></div>' }],
        theme: {
          screens: {
            mobile: '400px',
          },
        },
      }`
      )

      return run('@tailwind utilities').then((result) => {
        expect(result.css).toMatchFormattedCss(css`
          @media (min-width: 400px) {
            .mobile\:font-bold {
              font-weight: 700;
            }
          }
        `)
      })
    })
  })

  test('tailwind.config.cjs is picked up by default when passing an empty object', () => {
    return inTempDirectory(() => {
      fs.writeFileSync(
        path.resolve(cjsConfigFile),
        javascript`module.exports = {
        content: [{ raw: '<div class="mobile:font-bold"></div>' }],
        theme: {
          screens: {
            mobile: '400px',
          },
        },
      }`
      )

      return run('@tailwind utilities', {}).then((result) => {
        expect(result.css).toMatchFormattedCss(css`
          @media (min-width: 400px) {
            .mobile\:font-bold {
              font-weight: 700;
            }
          }
        `)
      })
    })
  })

  test('tailwind.config.js is picked up by default when passing an empty object', () => {
    return inTempDirectory(() => {
      fs.writeFileSync(
        path.resolve(defaultConfigFile),
        javascript`module.exports = {
        content: [{ raw: '<div class="mobile:font-bold"></div>' }],
        theme: {
          screens: {
            mobile: '400px',
          },
        },
      }`
      )

      return run('@tailwind utilities', {}).then((result) => {
        expect(result.css).toMatchFormattedCss(css`
          @media (min-width: 400px) {
            .mobile\:font-bold {
              font-weight: 700;
            }
          }
        `)
      })
    })
  })

  test('the default config can be overridden using the presets key', () => {
    let config = {
      content: [{ raw: html`<div class="min-h-primary min-h-secondary min-h-0"></div>` }],
      presets: [
        {
          theme: {
            extend: { minHeight: { secondary: '24px' } },
          },
        },
      ],
      theme: {
        extend: { minHeight: { primary: '48px' } },
      },
    }

    return run('@tailwind utilities', config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        .min-h-0 {
          min-height: 0;
        }
        .min-h-primary {
          min-height: 48px;
        }
        .min-h-secondary {
          min-height: 24px;
        }
      `)
    })
  })

  test('presets can be functions', () => {
    let config = {
      content: [{ raw: html`<div class="min-h-primary min-h-secondary min-h-0"></div>` }],
      presets: [
        () => ({
          theme: {
            extend: { minHeight: { secondary: '24px' } },
          },
        }),
      ],
      theme: {
        extend: { minHeight: { primary: '48px' } },
      },
    }

    return run('@tailwind utilities', config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        .min-h-0 {
          min-height: 0;
        }
        .min-h-primary {
          min-height: 48px;
        }
        .min-h-secondary {
          min-height: 24px;
        }
      `)
    })
  })

  test('the default config can be removed by using an empty presets key in a preset', () => {
    let config = {
      content: [{ raw: html`<div class="min-h-primary min-h-secondary min-h-0"></div>` }],
      presets: [
        {
          presets: [],
          theme: {
            extend: { minHeight: { secondary: '24px' } },
          },
        },
      ],
      theme: {
        extend: { minHeight: { primary: '48px' } },
      },
    }

    return run('@tailwind utilities', config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        .min-h-primary {
          min-height: 48px;
        }
        .min-h-secondary {
          min-height: 24px;
        }
      `)
    })
  })

  test('presets can have their own presets', () => {
    let config = {
      content: [{ raw: html`<div class="bg-red bg-transparent bg-black bg-white"></div>` }],
      presets: [
        {
          presets: [],
          theme: {
            colors: { red: '#dd0000' },
          },
        },
        {
          presets: [
            {
              presets: [],
              theme: {
                colors: {
                  transparent: 'transparent',
                  red: '#ff0000',
                },
              },
            },
          ],
          theme: {
            extend: {
              colors: {
                black: 'black',
                red: '#ee0000',
              },
              backgroundColor: (theme) => theme('colors'),
            },
          },
          corePlugins: ['backgroundColor'],
        },
      ],
      theme: {
        extend: { colors: { white: 'white' } },
      },
    }

    return run('@tailwind utilities', config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        .bg-black {
          background-color: #000;
        }
        .bg-red {
          background-color: #e00;
        }
        .bg-transparent {
          background-color: #0000;
        }
        .bg-white {
          background-color: #fff;
        }
      `)
    })
  })

  test('function presets can be mixed with object presets', () => {
    let config = {
      content: [{ raw: html`<div class="bg-red bg-transparent bg-black bg-white"></div>` }],
      presets: [
        () => ({
          presets: [],
          theme: {
            colors: { red: '#dd0000' },
          },
        }),
        {
          presets: [
            () => ({
              presets: [],
              theme: {
                colors: {
                  transparent: 'transparent',
                  red: '#ff0000',
                },
              },
            }),
          ],
          theme: {
            extend: {
              colors: {
                black: 'black',
                red: '#ee0000',
              },
              backgroundColor: (theme) => theme('colors'),
            },
          },
          corePlugins: ['backgroundColor'],
        },
      ],
      theme: {
        extend: { colors: { white: 'white' } },
      },
    }

    return run('@tailwind utilities', config).then((result) => {
      expect(result.css).toMatchFormattedCss(css`
        .bg-black {
          background-color: #000;
        }
        .bg-red {
          background-color: #e00;
        }
        .bg-transparent {
          background-color: #0000;
        }
        .bg-white {
          background-color: #fff;
        }
      `)
    })
  })
})