Скачать или смотреть Typescript Tutorial #71 Creating Method Decorators typescript

The method decorator is attached before a method is declared and has three arguments to help observe, replace or modify the method declaration. These arguments are:

Target: Usually points to the prototype of a class or its constructor function
Property key: Points to the name of the method that is attached to it.
Descriptor: Acts as a Property Descriptor of the method.

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