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TypeScript Property Decorators
A Property Decorator is declared just before a property declaration. A property decorator cannot be used in a declaration file, or in any other ambient context (such as in a declare class).
The expression for the property decorator will be called as a function at runtime, with the following two arguments:
Either the constructor function of the class for a static member, or the prototype of the class for an instance member.
The name of the member.
A Property Descriptor is not provided as an argument to a property decorator due to how property decorators are initialized in TypeScript. This is because there is currently no mechanism to describe an instance property when defining members of a prototype, and no way to observe or modify the initializer for a property. The return value is ignored too. As such, a property decorator can only be used to observe that a property of a specific name has been declared for a class.
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