TypeScript - pass to constructor entire object

Question

I have a class at type script:

export class Child {
  name:string;
  age:number;
}

I want to force class instances to have only properties

Answer 1

What we want:

• one time declare class fields
• have methods in our class

Solution:

class Animal {
  name: string = 'default value';
  group: string = 'default value';

  constructor(data: Partial = {}) {
    Object.assign(this, data)
  }

  echo() {
    return `My name is ${this.name}, I'm from: ${this.group}`;
  }
}

class Dog extends Animal {
  echo() {
    return super.echo() + ' from Dog class';
  }
}

const dog = new Dog({name: 'Teddy'});
console.log(dog.echo());

Animal - root class

Dog - nested class

All works without typescript errors