Ways to broaden your understanding of TypeScript's latest inheritance features

How can I ensure that TypeScript is aware of all the inheritances that occur in the Base variable of the Factory class so that I don't encounter any errors? It seems like there should be a way to achieve this since I do get the desired result in the end, but I keep getting errors like

Property 'X' does not exist on type 'Rect'
.

interface IPrintable {
    print(): void;
}

interface ILoggable {
    log(): void;
}

class Factory<T extends new (...args: any) => IShape> {
    constructor(public Base: T) {}

    Printable() {
        this.Base = class extends this.Base implements IPrintable {
            print() {
                console.log(`${this.x}:${this.y}`);
            }
        }

        return this;
    }

    Loggable() {
        this.Base = class extends this.Base implements ILoggable {
            log() {
                console.log(`${this.x}:${this.y}`);
            }
        }

        return this;
    }
}

interface IShape {
    x: number,
    y: number
}

class Rect implements IShape {
    constructor(
        public x: number,
        public y: number
    ) {}
}

const RectMaxed = new Factory(Rect).Printable().Loggable().Base;
const rectMaxed = new RectMaxed(10, 20);
rectMaxed.print();
rectMaxed.log();

Answer №1

To incorporate a new method, it is essential to generate a fresh factory instance each time. Test the following code snippet:

interface IPrintable {
    print(): void;
}

interface ILoggable {
    log(): void;
}

type Constructor<T> = new (...args: any[]) => T;

class Factory<T extends new (...args: any) => IShape> {
    constructor(public Base: T) {}

    Printable() {
        return new Factory<T & Constructor<IPrintable>>(class extends this.Base implements IPrintable {
            print() {
                console.log(`${this.x}:${this.y}`);
            }
        });
    }

    Loggable() {
        return new Factory<T & Constructor<ILoggable>>(class extends this.Base implements ILoggable {
            log() {
                console.log(`${this.x}:${this.y}`);
            }
        });
    }
}

interface IShape {
    x: number,
    y: number
}

class Rect implements IShape {
    constructor(
        public x: number,
        public y: number
    ) {}
}

const RectMaxed = new Factory(Rect).Printable().Loggable().Base;
const rectMaxed = new RectMaxed(10, 20);
rectMaxed.print();
rectMaxed.log();

A custom type Constructor<T> has been added to represent a class entity. Feel free to experiment with it here.

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