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    `add` Inner Subscriptions to Outer Subscribers to `unsubscribe` in RxJS

    rxjsRxJS
    ^6.0.0

    When subscribers create new "inner" sources and subscriptions, you run the risk of losing control of them when the outer subscriber unsubscribes. This is handled easily enough if you use the add method from the Subscriber class to add the "inner" subscription to the Subscriber.