Enhancing TypeScript Types with a custom method within an Angular 2 context

I am working on an Angular 2 project using the CLI. Currently, I am trying to add a custom method to the String type as shown below.

interface String {
    customMethod(): number;
}

String.prototype.customMethod = function() {
   return 0;
}

Despite my efforts, the compiler is still throwing errors. Can anyone provide guidance on where I should place this code in the project for it to work correctly? Your help is greatly appreciated.

Answer №1

When working with Angular CLI, it's important to inform TypeScript about certain things. In order to do this, you can add the following code snippet to your typings.d.ts file:

  interface String {
    bar(): string;
  }

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