Interfaces and Accessor Methods

Here is my code snippet:

interface ICar {
    brand():string;
    brand(brand:string):void;
}

class Car implements ICar {
    private _brand: string;

    get brand():string {
        return this._brand;
    }

    set brand(brand:string) {
        this._brand = brand;
    }


}

var car = new Car();
car.brand = 'Toyota';

Upon closer inspection, it seems like the interface is properly implemented. However, when trying to compile with tsc, an error is thrown:

C:\Users\User>tsc interfaces.ts --target "es5"
interfaces.ts(11,7): error TS2420: Class 'Car' incorrectly implements interface 'ICar'.
  Types of property 'brand' are incompatible.
    Type 'string' is not assignable to type '{ (): string; (brand: string): void; }'.

Answer №1

When creating a property, make sure it is implemented in the interface like this:

interface IEngine {
    type:string;
}

Answer №2

Typescript interfaces provide a useful way to outline the structure of an object you need. For instance, if you require an object with a property named type, you can achieve this by declaring:

interface ICar {
    type: string;
}

The implementation specifics, such as getters and setters, are left to be defined within objects that adhere to the interface, like the Car type referenced in your inquiry.

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