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TypeScript - interface constructor

11 points
Created by:
AnnLen
9180

In TypeScript interface with a constructor can not be implemeneted by any class, but it is possible use constructor interface in following way.

Constructor interface example

interface ISquare {
    getName() : string;
    
    // other method declarations...
}

interface ISquareConstructor {
    new (name : string) : ISquare;
}

class LocalSquare implements ISquare {
    
    public constructor(private name : string) {
        // nothing here...
    }

    public getName() : string {
        return this.name;
    }

    // other method definitions...
}

function createSquare(builder : ISquareConstructor, name : string) : ISquare {
    // ISquareConstructor -> new (name : string) : ISquare
    return new builder(name);
}

let square = createSquare(LocalSquare, 'Square');

console.log(square.getName());
// other method usage...

Output:

Square

Run it online here.

References

  1. Difference between the static and instance sides of classes - Microsoft Docs

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