Can an extension be developed in TypeScript that applies to all types of objects?

I am looking to achieve something similar in C# with the following example code snippet:

namespace CustomFramework
{
    public static class CustomExtensions
    {
        public static void CustomMethod(this object someObject)
        {
            // custom logic here
        }
    }
}

Answer №1

According to Alex Wayne, engaging in such practices is usually not recommended, unless it is solely for polyfill purposes.

It is indeed possible to achieve this in Typescript due to the extensibility of interfaces (see documentation). By extending the Object interface, you can introduce new functionalities to Object.prototype; alternatively, you can extend specific interfaces like Array without impacting every object.

interface Object {
    foo(): void;
}

Object.prototype.foo = () => console.log('bar');

const a: {} = {};
a.foo();

Access the example on the Typescript Playground via this link to the playground.

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