安装less，less-loader"；在lessRegex里面配置modules,里面配置localIdentName

{
              test: lessRegex,
              exclude: lessModuleRegex,
              use: getStyleLoaders(
                {
                  importLoaders: 3,
                  sourceMap: isEnvProduction && shouldUseSourceMap,
                  modules: {
                    localIdentName: '[local]___[hash:base64:5]',
                  },
                },
                'less-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,
            },

同理less。但最好不要同时配置less和sass。如果同时配置，且引入第三方插件及其样式，那么该插件的样式既不用less，也不能用sass,因为都会被转化。

{
              test: sassRegex,
              exclude: sassModuleRegex,
              use: getStyleLoaders(
                {
                  importLoaders: 3,
                  sourceMap: isEnvProduction && shouldUseSourceMap,
                  modules: {
                    localIdentName: '[path][name]__[local]--[hash:base64:5]'
                  }
                },
                '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,
            },