Steps to using a decorator in Typescript (Angular) to add and declare a new property to a class

Attempting to enhance a class with a new property using a decorator. See the code below:

function classDecorator<T extends {new(...args: any[]): {}}>(constructor: T) {
    constructor.prototype.newProperty = 'some value';
}


@classDecorator
class MyClass {
  property1: string = 'value1';
  property2: string = 'value1';
}
const obj = new MyClass();

console.log(obj);
console.log(obj.property1);
console.log(obj.property2);
console.log(obj.newProperty); // error TS2551: Property 'newProperty' does not exist on type 'MyClass'

Is there a way to make Angular recognize that MyClass also includes newProperty? Can this be achieved through a .d.ts file?

Answer №1

this article may provide the solution you're looking for:

Tips on enhancing a class with a new property using class decorator

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