postcss-property-mapping

PostCSS plugin Allow CSS Custom Properties To Pull Their Value From The Same Objects Computed Styles.

.foo {
  /* Input example */
}

.foo {
  /* Output example */
}

Usage

Step 1: Install plugin:

npm install --save-dev postcss postcss-property-mapping

Step 2: Check you project for existed PostCSS config: postcss.config.js in the project root, "postcss" section in package.json or postcss in bundle config.

If you do not use PostCSS, add it according to official docs and set this plugin in settings.

Step 3: Add the plugin to plugins list:

module.exports = {
  plugins: [
+   require('postcss-property-mapping'),
    require('autoprefixer')
  ]
}