Decorators

TypeScript decorators provide a powerful system for annotating class declarations and modifying functionality outside of the standard class inheritance mechanisms.

It provides you full control over a class declaration, along with the properties and methods declared in that class.

Class decorators

With decorator functions, you can take complete control over how a class declaration works. Notice in the example below that the classDecorator function is called before any instances of the class are created.

A common pattern for using decorators is to provide a decorator factory function, which produces a function whose type matches the global utility type ClassDecorator.

Property decorators

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Accessor decorators

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Method decorators

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Parameter decorators

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