Using Observable in APP_INITIALIZER

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    • Note: This feature was added in v12.0.0-next.2.

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    • Up until now, if you wanted to execute something asynchronous as part of APP_INITIALIZER, say an HTTP request to get some configuration, your only option was to convert it to a Promise. Often times using toPromise() (which, btw, is deprecated in the upcoming RxJS v7).

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