使用css modules在生产环境下不起作用

Question

使用css-modules在开发环境下正常，在生产环境下；子样式丢失：

这是我的webpack配置:

{
        test: /\.css$/,
        loader: ExtractTextPlugin.extract(
          Object.assign(
            {
              fallback: require.resolve('style-loader'),
              use: [
                {
                  loader: require.resolve('css-loader'),
                  options: {
                    importLoaders: 1,
                    minimize: true,
                    sourceMap: true,
                    modules: true,
                    localIdentName: '[name]__[local]___[hash:base64:5]'
                  },
                },
                {
                  loader: require.resolve('postcss-loader'),
                  options: {
                    ident: 'postcss', // https://webpack.js.org/guides/migrating/#complex-options
                    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',
                      }),
                    ],
                  },
                },
              ],
            },
            extractTextPluginOptions
          )
        ),