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Using platformBrowserDynamic with Angular Universal is a bit of a hack. All we are doing is providing configuration to the application server module so that it has configuration server-side before platformBrowserDynamic can load it on the client.

Scenarios where configuration will be injected only into services and components work well with the APP_INITIALIZER technique. If however we need to configure an application consisting of multiple modules, with each requiring configuration, even partial configuration, then an alternative is necessary.

The APP_INITIALIZER token in Angular can also be used to delay the bootstrapping of the application for Angular Universal

Although the standard out-of-the-box Angular application makes it easy to create and configure options for your application using 'environment' files, this approach has a few issues