How can one define a getter within an interface?

One of my classes is structured like this (only showing a portion here):

export class LinkedListNode<t> extends windward.WrObject implements ILinkedListNode<t> {
   public get next(): LinkedListNode<t> {
        return this._next === this._list._first ? null : this._next;
    }
}

In the interface, I am attempting to declare `next` as a method. However, the following approach does not yield the desired outcome:

export interface ILinkedListNode<t> {
       get next(): LinkedListNode<t>;
}

The alternative solution works, but it lacks precision:

export interface ILinkedListNode<t> {
       next: LinkedListNode<t>;
}

Is there a way to define a getter within an interface? Getters have distinct characteristics from member variables, such as not being transmitted to a web worker when posting an object.

Thanks - Dave

Answer №1

Sorry, this functionality is not supported in TypeScript at the moment, unlike some other programming languages such as C#.

If you require similar functionality, consider implementing it as a method like so:

export interface ILinkedListNode<t> {
    getNext(): LinkedListNode<t>;
}

Answer №2

As of this moment, there is currently no way to achieve your desired outcome.

There has been an issue opened on TypeScript's Github since July 2014, and the functionality you are looking for will be made available once it is implemented.

The closest way to approximate what you need is by following David Sherret's suggestion in his response: creating a getter method.

export interface ILinkedListNode<t> {
  getNext(): LinkedListNode<t>;
}

However, I suggest only adding the property to your interface for now, and then updating it to a read-only or get version when it becomes accessible in the future.

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