Definition of a class in Typescript when used as a property of an object

Question

Definition of a class in Typescript when used as a property of an object

Currently working on a brief .d.ts for this library, but encountered an issue with the following:

class Issuer {
    constructor(metadata) {
        // ...
        const self = this;
        Object.defineProperty(this, 'Client', {
            value: class Client extends BaseClient {
                static get issuer() {
                    return self;
                }
                get issuer() {
                    return this.constructor.issuer;
                }
            },
        });
    }
    // ...
}

In the user facing API, it is utilized like this (where googleIssuer is an instance of Issuer).

const client = new googleIssuer.Client({
    // ...
})

I attempted extending the Issuer class definition with a namespace of the same name, but it did not work as expected.

What would be the most straightforward way to represent this in my definition?

javascript typescript typescript-definitions

Answer 1

Answer №1

By utilizing class and namespace merging, you can achieve the functionality of a static class (a class that is accessed using the class itself, not through an instance of the class):

declare class Issuer {

}

declare namespace Issuer {
    class Client{}
}
declare class GoogleIssuer extends Issuer {
}
let d = new GoogleIssuer.Client() // This works fine
let googleIssuer = new GoogleIssuer();
let c = new googleIssuer.Client() // This will result in an error

If you are looking for a way to define a class that is associated with an instance of the class, you can simply declare the class as a field within the Issuer class:

// Define the structure of client separately 
declare class Client {

}
declare class Issuer {
    Client: typeof Client; // Declare a field that is of the type class
}
declare class GoogleIssuer extends Issuer {
}
let googleIssuer = new GoogleIssuer();
let c = new googleIssuer.Client() // This is acceptable

Answer 2

By utilizing class and namespace merging, you can achieve the functionality of a static class (a class that is accessed using the class itself, not through an instance of the class):

declare class Issuer {

}

declare namespace Issuer {
    class Client{}
}
declare class GoogleIssuer extends Issuer {
}
let d = new GoogleIssuer.Client() // This works fine
let googleIssuer = new GoogleIssuer();
let c = new googleIssuer.Client() // This will result in an error

If you are looking for a way to define a class that is associated with an instance of the class, you can simply declare the class as a field within the Issuer class:

// Define the structure of client separately 
declare class Client {

}
declare class Issuer {
    Client: typeof Client; // Declare a field that is of the type class
}
declare class GoogleIssuer extends Issuer {
}
let googleIssuer = new GoogleIssuer();
let c = new googleIssuer.Client() // This is acceptable

Definition of a class in Typescript when used as a property of an object

Answer №1

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