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A helper for getting tailwind values into css custom properties and switching them between media queries and classes. A quick example can be found here: https://tailwindcss-theme-swapper.crswll.now.sh/ and you can mess around with it yourself here https://play.tailwindcss.com/Hg9AO7mqWa

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tailwindcss-theme-swapper

Extend your tailwind config with CSS Custom Properties and trigger the updating of them with any type of selector or media query.

Requirements

  • Tailwind 1.2

Browser Support

Just needs to support CSS Custom Properties. IE11 can kind of work but only the base theme with something like postcss-preset-env.

Installation

yarn add tailwindcss-theme-swapper
# or
npm install tailwindcss-theme-swapper --save-dev

Try It Out

https://play.tailwindcss.com/Hg9AO7mqWa

Usage Example

In your tailwind.config.js:

const themeSwapper = require('tailwindcss-theme-swapper')

module.exports = {
  plugins: [
    themeSwapper({
      themes: [
        // The only required theme is `base`. Every property used in
        // other themes must exist in here.
        {
          name: 'base',
          selectors: [':root'],
          theme: {
            colors: {
              primary: '#f00',
            },
          },
        },
        {
          name: 'dark',
          selectors: ['.dark'],
          mediaQuery: '@media (prefers-color-scheme: dark)',
          theme: {
            colors: {
              primary: '#fff',
            },
          },
        },
        {
          name: 'matrix',
          selectors: ['.matrix'],
          theme: {
            colors: {
              primary: '#0f0',
            },
          },
        },
      ],
    }),
  ],
}

Theme Swapper Properties

{
  // The name of the theme. You only have to name `base`.
  name: 'dark',

  // Apply one of these selectors(?) to an element and all of its children to use that theme.
  // `<div class="dark">`, `<div data-theme="dark">`, `<div dark>`
  selectors: ['.dark', '[data-theme="dark"]', '[dark]', ],

  // If this media query matches the theme will apply to the entire page.
  mediaQuery: '@media (prefers-color-scheme: dark)',

  // This extends your tailwind theme.
  // Only keys/values defined here will be made into custom properties.
  theme: {
    colors: {
      // ...
    },
    spacing: {
      // ...
    },
    borderRadius: {
      // ...
    },
  },
}

Example I:O

Themes Input

const themes = [
  {
    name: 'base',
    selectors: [':root'],
    theme: {
      colors: {
        primary: '#222',
      },
    },
  },
  {
    name: 'dark',
    selectors: [
      '.dark',
      '[dark]',
      '[data-theme="dark"]'
    ],
    mediaQuery: '@media (prefers-color-scheme: dark)',
    theme: {
      colors: {
        primary: '#ddd',
      },
    },
  },
  {
    name: 'high-contrast',
    mediaQuery: '@media (prefers-contrast: high)',
    theme: {
      colors: {
        primary: '#ddd',
      },
    },
  },
]

CSS Output

:root {
  --colors-primary: 34 34 34
}

@media (prefers-color-scheme: dark) {
  :root {
    --colors-primary: 221 221 221
  }
}

.dark, [dark], [data-theme="dark"] {
  --colors-primary: 221 221 221
}

@media (prefers-contrast: high) {
  :root {
    --colors-primary: 255 255 255
  }
}

/* ... */

.text-primary {
  --tw-text-opacity: 1;
  color: rgb(var(--colors-primary) / var(--tw-text-opacity));
}

.bg-primary {
  --tw-bg-opacity: 1;
  background-color: rgb(var(--colors-primary) / var(--tw-bg-opacity));
}

.border-primary {
  --tw-border-opacity: 1;
  border-color: rgb(var(--colors-primary) / var(--tw-border-opacity));
}

About

A helper for getting tailwind values into css custom properties and switching them between media queries and classes. A quick example can be found here: https://tailwindcss-theme-swapper.crswll.now.sh/ and you can mess around with it yourself here https://play.tailwindcss.com/Hg9AO7mqWa

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