Any class that utilizes the interface `IGeneratable` must include an `IGeneratorConstructor<T>` where `T` represents the class implementing the `IGeneratable` interface

My goal is to enforce the requirement that any class implementing the IGeneratable interface must also provide a IGeneratorConstructor<T>, where T represents the class implementing IGeneratable.

Is this achievable in TypeScript (specifically version 3.8.3)? If so, how can it be done?

export class Example implements IGeneratable {
    public generator = ExampleGenerator;
}

export class ExampleGenerator implements IGenerator<Example> {
    private _component: Example;

    constructor(context: GeneratorContext<Example>) {
        this._component = context.component;
    }

    getId(): string {
        return 'myID';
    }

    build(): void {
        // Perform actions using information from this.component
    }
}

The following are the current types being used:

export interface IGeneratable {
    generator: IGeneratorConstructor<any>; // Assistance needed here
}

export interface GeneratorContext<TComponent extends IGeneratable> {
    scene: Scene;
    component: TComponent;
}

export interface IGenerator<TComponent extends IGeneratable> {
    getId(): string;

    build(): void;
}

export interface IGeneratorConstructor<TComponent extends IGeneratable> {
    new (context: GeneratorContext<TComponent>): IGenerator<TComponent>;
}

Answer №1

To introduce generic typing to the IGeneratable interface, you can define it with a type parameter:

export interface IGeneratable<TComponent extends IGeneratable<TComponent>> {
    generator: IGeneratorConstructor<TComponent>; // assistance needed here
}

export interface GeneratorContext<TComponent extends IGeneratable<TComponent>> {
    scene: Scene;
    component: TComponent;
}

export interface IGenerator<TComponent extends IGeneratable<TComponent>> {
    getId(): string;

    build(): void;
}

export interface IGeneratorConstructor<TComponent extends IGeneratable<TComponent>> {
    new (context: GeneratorContext<TComponent>): IGenerator<TComponent>;
}

The code below triggers an expected error message:

export class Example2 implements IGeneratable<Example2> {
    // no generator defined
}

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