How to add and declare new property to class using decorator in typescript angular

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I'm trying to add new property to class using decorator. Here is my code

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 any way to make angular to understand that MyClass also have newProperty ? Can I do it with .d.ts file?

Jul 5, 2022 in TypeSript by Logan
• 2,140 points
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