TypeScript Functional Inheritance with Prototypes working

FunctionalInheritance.ts

const MyConstructor: IMyConstructor = function (this: MyConstructorInstance, name: string) {
    this.name = name;
} as IMyConstructor;

MyConstructor.prototype.name = 'default';
MyConstructor.prototype._char = 'default';
Object.defineProperty(MyConstructor.prototype, 'char', {
    get(this: MyConstructorInstance) {
        return this._char;
    },
    set(this: MyConstructorInstance, value: string) {
        this._char = value;
    }
});

interface IMyConstructor {
    new (name: string): MyConstructorInstance
    (name: string): never
    prototype: MyConstructorInstance
}
interface MyConstructorInstance {
    _char: string
    name: string
    char: string
}

const myConstructorInstance = new MyConstructor('ready');
// myConstructorInstance.missing = 'something'; // will handle missing field
console.log('default field', myConstructorInstance.char);
console.log('replaced field', myConstructorInstance.name);
const myConstructorInstanceProto: MyConstructorInstance = Object.getPrototypeOf(myConstructorInstance);
console.log('previous value of replaced field', myConstructorInstanceProto.name);

FunctionalInheritanceGenerics.ts

const MyConstructor = function (this: MyConstructorInstance, name: string) {
    this.name = name;
} as IMyConstructor<MyConstructorInstance>;

(() => {
    let char = 'default';
    MyConstructor.prototype.name = 'default';
    Object.defineProperty(MyConstructor.prototype, 'char', {
        get(this: MyConstructorInstance) {
            return char;
        },
        set(this: MyConstructorInstance, value: string) {
            char = value;
        }
    });
})();

interface IMyConstructor <A> {
    new(name: string): A
    (name: string): void
    prototype: A
}
type MyConstructorInstance = {
    name: string
    char: string
    constructor: IMyConstructor<MyConstructorInstance>
}

const myConstructorInstance = new MyConstructor('ready');
// myConstructorInstance.missing = 'something'; // will handle missing field
console.log('default field', myConstructorInstance.char);
console.log('replaced field', myConstructorInstance.name);
const myConstructorInstanceProto: MyConstructorInstance = Object.getPrototypeOf(myConstructorInstance);
console.log('previous value of replaced field', myConstructorInstanceProto.name);

FunctionalInheritancePrivateFields.ts

const MyConstructor: IMyConstructor = function (this: MyConstructorInstance, name: string) {
    this.name = name;
} as IMyConstructor;

(() => {
    let char = 'default';
    MyConstructor.prototype.name = 'default';
    Object.defineProperty(MyConstructor.prototype, 'char', {
        get(this: MyConstructorInstance) {
            return char;
        },
        set(this: MyConstructorInstance, value: string) {
            char = value;
        }
    });
})();

interface IMyConstructor {
    new(name: string): MyConstructorInstance
    (name: string): never
    prototype: MyConstructorInstance
}
interface MyConstructorInstance {
    name: string
    char: string
}

const myConstructorInstance = new MyConstructor('ready');
// myConstructorInstance.missing = 'something'; // will handle missing field
console.log('default field', myConstructorInstance.char);
console.log('replaced field', myConstructorInstance.name);
const myConstructorInstanceProto: MyConstructorInstance = Object.getPrototypeOf(myConstructorInstance);
console.log('previous value of replaced field', myConstructorInstanceProto.name);