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Angular - Auto-unsubscribe

One of the nice underused features of Angular is the support for decorators (through Typescript).

From the Typescript documentation:

A Decorator is a special kind of declaration that can be attached to a class declaration, method, accessor, property, or parameter. Decorators use the form @expression, where expression must evaluate to a function that will be called at runtime with information about the decorated declaration. 

A nice example of the usage of decorators is the ngx-auto-unsubscribe library.  This Class decorator that will automatically unsubscribe from observable subscriptions when the component is destroyed.

An example:

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