create-react-app 配置 less

安装less-loader 和 less

npm install less-loader less --save-dev
修改 webpack.config.dev.js 和 webpack.config-prod.js 配置文件

exclude: [
  /\.html$/,
  /\.(js|jsx)$/,
  /\.(css|less)$/,   //需要修改的地方
  /\.json$/,
  /\.bmp$/,
  /\.gif$/,
  /\.jpe?g$/,
  /\.png$/,
],
{
  test: /\.(css|less)$/,   //需要修改的地方
  use: [
    require.resolve('style-loader'),
    {
      loader: require.resolve('css-loader'),
      options: {
        importLoaders: 1,
      },
    },
    {
      loader: require.resolve('postcss-loader'),
      options: {
        // Necessary for external CSS imports to work
        // https://github.com/facebookincubator/create-react-app/issues/2677
        ident: 'postcss',
        plugins: () => [
          require('postcss-flexbugs-fixes'),
          autoprefixer({
            browsers: [
              '>1%',
              'last 4 versions',
              'Firefox ESR',
              'not ie < 9', // React doesn't support IE8 anyway
            ],
            flexbox: 'no-2009',
          }),
        ],
      },
    },
    //需要修改的地方
    {
      loader: require.resolve('less-loader') // compiles Less to CSS
    }
  ],
}