What is the process for triggering property decorators during runtime?

Wondering about dynamically invoking a property decorator at runtime. If we take a look at the code snippet below:

    function PropertyDecorator(
        target: Object, // The prototype of the class
        propertyKey: string | symbol // The name of the property
        ) {
        console.log("PropertyDecorator called on: ", target, propertyKey);
    }

    class PDE {
        @PropertyDecorator
        name: string;
    }

When this code is executed, it will log

PropertyDecorator called on:  PDE {} name
, indicating that the decorator is being called when the class is loaded. But what if we want to invoke it again on an instance of PDE like so:

const newPDE = PDE();
callDecoratorsOnProperties(newPDE);

How can we achieve that?

Answer №1

The feedback provided is accurate. Property decorators are only applicable during design time and cannot be utilized at runtime. The logging functionality in the example given executes solely during class loading and then remains inactive thereafter. It is essential for the 'load' event to facilitate additional mechanisms for handling instance validation, which is the primary objective in this scenario.

Adjusting the prototype of the class becomes necessary in order to incorporate an extra function that permits the validation of annotated class instances.

For those who are interested in exploring similar concepts, my subsequent inquiry delves into the topic of how to pass supplementary arguments to a decorator.

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