create-react-app eject 之后 配置less

在

// style files regexes下添加如下两个常量

 

const lessRegex =/.less$/;

const lessModuleRegex=/.module.less$/;

 

如下

// Check if TypeScript is setup
const useTypeScript = fs.existsSync(paths.appTsConfig);

// style files regexes
const cssRegex = /.css$/;
const cssModuleRegex = /.module.css$/;
const sassRegex = /.(scss|sass)$/;
const sassModuleRegex = /.module.(scss|sass)$/;

//在此添加如下两个常量
const lessRegex =/.less$/;
const lessModuleRegex=/.module.less$/;

// This is the production and development configuration.
// It is focused on developer experience, fast rebuilds, and a minimal bundle.
module.exports = function(webpackEnv) {

在

{

test: cssRegex,

....

}

后面

仿照上面添加如下代码

//在这之后仿照上面添加如下代码
            {
                test: lessRegex,
                exclude: lessModuleRegex,
                use: getStyleLoaders(
                    {
                        importLoaders: 2,
                        sourceMap: isEnvProduction && shouldUseSourceMap,
                    },
                    'less-loader'
                ),
                sideEffects: true,
              },
              {
                test: lessModuleRegex,
                use: getStyleLoaders(
                    {
                        importLoaders: 2,
                        sourceMap: isEnvProduction && shouldUseSourceMap,
                        modules: true,
                        getLocalIdent: getCSSModuleLocalIdent,
                    },
                    'less-loader'
                ),
               
              },

代码如下：

{
              test: cssRegex,
              exclude: cssModuleRegex,
              use: getStyleLoaders({
                importLoaders: 1,
                sourceMap: isEnvProduction && shouldUseSourceMap,
              }),
              // Don't consider CSS imports dead code even if the
              // containing package claims to have no side effects.
              // Remove this when webpack adds a warning or an error for this.
              // See https://github.com/webpack/webpack/issues/6571
              sideEffects: true,
            },
            // Adds support for CSS Modules (https://github.com/css-modules/css-modules)
            // using the extension .module.css
            {
              test: cssModuleRegex,
              use: getStyleLoaders({
                importLoaders: 1,
                sourceMap: isEnvProduction && shouldUseSourceMap,
                modules: {
                  getLocalIdent: getCSSModuleLocalIdent,
                },
              }),
            },

            //在这之后仿照上面添加如下代码
            {
                test: lessRegex,
                exclude: lessModuleRegex,
                use: getStyleLoaders(
                    {
                        importLoaders: 2,
                        sourceMap: isEnvProduction && shouldUseSourceMap,
                    },
                    'less-loader'
                ),
                sideEffects: true,
              },
              {
                test: lessModuleRegex,
                use: getStyleLoaders(
                    {
                        importLoaders: 2,
                        sourceMap: isEnvProduction && shouldUseSourceMap,
                        modules: true,
                        getLocalIdent: getCSSModuleLocalIdent,
                    },
                    'less-loader'
                ),
               
              },
  
            // Opt-in support for SASS (using .scss or .sass extensions).
            // By default we support SASS Modules with the
            // extensions .module.scss or .module.sass
            {
              test: sassRegex,
              exclude: sassModuleRegex,
              use: getStyleLoaders(
                {
                  importLoaders: 3,
                  sourceMap: isEnvProduction && shouldUseSourceMap,
                },
                'sass-loader'
              ),
              // Don't consider CSS imports dead code even if the
              // containing package claims to have no side effects.
              // Remove this when webpack adds a warning or an error for this.
              // See https://github.com/webpack/webpack/issues/6571
              sideEffects: true,
            },
            // Adds support for CSS Modules, but using SASS
            // using the extension .module.scss or .module.sass
            {
              test: sassModuleRegex,
              use: getStyleLoaders(
                {
                  importLoaders: 3,
                  sourceMap: isEnvProduction && shouldUseSourceMap,
                  modules: {
                    getLocalIdent: getCSSModuleLocalIdent,
                  },
                },
                'sass-loader'
              ),
            },