为什么ExtractTextPlugin.extract会产生“ __webpack_require __（...）不是函数”错误

我有假设SASS文件的标准Webpack规则：

        {
          test: /\.scss$/,
          use: ExtractTextPlugin.extract({
                  fallback: 'style-loader',
                  use: [
                      {
                          loader: 'css-loader',
                          options: {
                              minimize: isProduction,
                              sourceMap: true,
                              importLoaders: 1
                          },
                      },
                    {
                      loader: 'resolve-url-loader',
                    },
                    {
                        loader: 'sass-loader',
                        options: {
                          sourceMap: true,
                        },
                    },
                    {
                      loader: 'postcss-loader',
                      options: {
                          sourceMap: !!isProduction,
                          config: {
                              path: './postcss.config.js'
                          }
                      }
                  },
                ],
              })
      },

但是，这似乎会产生错误：

Module build failed: TypeError: __webpack_require__(...) is not a function
    at Object.<anonymous> (/Users/wichert/CurveTips/ws/display/node_modules/css-loader/index.js??ref--2-2!/Users/wichert/CurveTips/ws/display/node_modules/resolve-url-loader/index.js!/Users/wichert/CurveTips/ws/display/node_modules/sass-loader/lib/loader.js??ref--2-4!/Users/wichert/CurveTips/ws/display/node_modules/postcss-loader/lib/index.js??ref--2-5!/Users/wichert/CurveTips/ws/display/packages/display-site/src/assets/styles/curvetips.scss:102:50)
    at __webpack_require__ (/Users/wichert/CurveTips/ws/display/node_modules/css-loader/index.js??ref--2-2!/Users/wichert/CurveTips/ws/display/node_modules/resolve-url-loader/index.js!/Users/wichert/CurveTips/ws/display/node_modules/sass-loader/lib/loader.js??ref--2-4!/Users/wichert/CurveTips/ws/display/node_modules/postcss-loader/lib/index.js??ref--2-5!/Users/wichert/CurveTips/ws/display/packages/display-site/src/assets/styles/curvetips.scss:22:30)
    at module.exports.module.exports (/Users/wichert/CurveTips/ws/display/node_modules/css-loader/index.js??ref--2-2!/Users/wichert/CurveTips/ws/display/node_modules/resolve-url-loader/index.js!/Users/wichert/CurveTips/ws/display/node_modules/sass-loader/lib/loader.js??ref--2-4!/Users/wichert/CurveTips/ws/display/node_modules/postcss-loader/lib/index.js??ref--2-5!/Users/wichert/CurveTips/ws/display/packages/display-site/src/assets/styles/curvetips.scss:65:18)
    at Object.<anonymous> (/Users/wichert/CurveTips/ws/display/node_modules/css-loader/index.js??ref--2-2!/Users/wichert/CurveTips/ws/display/node_modules/resolve-url-loader/index.js!/Users/wichert/CurveTips/ws/display/node_modules/sass-loader/lib/loader.js??ref--2-4!/Users/wichert/CurveTips/ws/display/node_modules/postcss-loader/lib/index.js??ref--2-5!/Users/wichert/CurveTips/ws/display/packages/display-site/src/assets/styles/curvetips.scss:68:10)
    at Module._compile (module.js:660:30)
    at Object.exec (/Users/wichert/CurveTips/ws/display/node_modules/webpack/lib/NormalModule.js:129:12)
    at /Users/wichert/CurveTips/ws/display/node_modules/extract-text-webpack-plugin/dist/loader.js:131:26
    at compile (/Users/wichert/CurveTips/ws/display/node_modules/webpack/lib/Compiler.js:300:11)
    at applyPluginsAsync.err (/Users/wichert/CurveTips/ws/display/node_modules/webpack/lib/Compiler.js:510:14)
    at next (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:202:11)
    at Compiler.<anonymous> (/Users/wichert/CurveTips/ws/display/node_modules/extract-text-webpack-plugin/dist/loader.js:112:7)
    at next (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:204:14)
    at Compiler.<anonymous> (/Users/wichert/CurveTips/ws/display/node_modules/awesome-typescript-loader/src/instance.ts:442:13)
    at next (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:204:14)
    at Compiler.<anonymous> (/Users/wichert/CurveTips/ws/display/node_modules/webpack/lib/CachePlugin.js:78:5)
    at Compiler.applyPluginsAsyncSeries (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:206:13)
    at compilation.seal.err (/Users/wichert/CurveTips/ws/display/node_modules/webpack/lib/Compiler.js:507:11)
    at Compilation.applyPluginsAsyncSeries (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:195:46)
    at self.applyPluginsAsync.err (/Users/wichert/CurveTips/ws/display/node_modules/webpack/lib/Compilation.js:680:19)
    at Compilation.applyPluginsAsyncSeries (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:195:46)
    at self.applyPluginsAsync.err (/Users/wichert/CurveTips/ws/display/node_modules/webpack/lib/Compilation.js:671:11)
    at next (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:202:11)
    at Compilation.<anonymous> (/Users/wichert/CurveTips/ws/display/node_modules/uglifyjs-webpack-plugin/dist/index.js:244:6)
    at next (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:204:14)
    at Compilation.compilation.plugin (/Users/wichert/CurveTips/ws/display/node_modules/webpack/lib/BannerPlugin.js:67:5)
    at next (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:204:14)
    at Compilation.<anonymous> (/Users/wichert/CurveTips/ws/display/node_modules/uglifyjs-webpack-plugin/dist/index.js:244:6)
    at Compilation.applyPluginsAsyncSeries (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:206:13)
    at self.applyPluginsAsync.err (/Users/wichert/CurveTips/ws/display/node_modules/webpack/lib/Compilation.js:666:10)
    at Compilation.applyPluginsAsyncSeries (/Users/wichert/CurveTips/ws/display/node_modules/tapable/lib/Tapable.js:195:46)

删除ExtractTextPlugin.extract调用并直接使用我的加载程序列表可以很好地工作，这使我怀疑ExtractTextPlugin.extract中缺少某些内容。