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RxJS: Never subscribe in a subscription

During a code review of an Angular code base I noticed the following code snippet:

What’s wrong with this code?

We are subscribing inside a subscription. This makes it almost impossible to know what subscriptions are open at what moment. Good luck closing these subscriptions in the correct way(which you are doing, right?).

A solution is to rewrite this code to use only 1 subscription. Closing this subscription will automatically clean up all inner streams. Let’s apply some RxJS magic to fix this:

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