Before going further, the webpack.config.vendor.js file needs to be updated as well in order to fix a nasty bug that would prevent it from working as expected with Angular 5. Open that file and add the following line to the already existing sharedConfig.plugin array in the following way (new line highlighted):
[...]plugins: [ new webpack.ProvidePlugin({ $: 'jquery', jQuery: 'jquery' }), // Maps these identifiers to the jQuery package (because Bootstrap expects it to be a global variable) new webpack.ContextReplacementPlugin(/\@angular\b.*\b(bundles|linker)/, path.join(__dirname, './ClientApp')), // Workaround for https://github.com/angular/angular/issues/11580 new webpack.ContextReplacementPlugin(/angular(\\|\/)core(\\|\/)@angular/, ...
