#tools.minifyCss

• Type: Object | Function | undefined
• Default:

const defaultOptions = {
  minimizerOptions: {
    preset: [
      'default',
      {
        mergeLonghand: false,
      },
    ],
  },
};

When building for production, Modern.js will minimize the CSS code through css-minimizer-webpack-plugin. The config of css-minimizer-webpack-plugin can be modified via tools.minifyCss.

#Object Type

When tools.minifyCss is Object type, it will be merged with the default config via Object.assign.

For example, modify the preset config of cssnano:

export default {
  tools: {
    minifyCss: {
      minimizerOptions: {
        preset: require.resolve('cssnano-preset-simple'),
      },
    },
  },
};

#Function Type

When tools.minifyCss is Function type, the default config is passed in as the first parameter, the config object can be modified directly, or a value can be returned as the final result.

export default {
   tools: {
    minifyCss: options => {
      options.minimizerOptions = {
        preset: require.resolve('cssnano-preset-simple'),
      },
    }
  }
};