Does TypeScript support constructor with object initializer？

Question

For example, in c#, we have this snippet:

 class OrderLine
    {
        public OrderLine(){
          OrderId ="1",
          ItemTitle ="2"
        Console.WriteLine("constructing");
        }
        public string Platform { get; set; }
        public string OrderId { get; set; }
        public string ItemTitle { get; set; }
    }

    public static void Main()
    {
        var ol = new OrderLine 
        {
                Platform ="p"
        };
        Console.WriteLine(ol.Platform); 
    }

In Typescript, if I use {} to initialize an object, I won't be able to call the constrcuor which can give me some default value and do something else. if I use new key word to do some default construction, my compiler doesn't allow me to use object initializer(I am using angular 6), and I have to call ol.Platform to assign property value. When I have several properties to set value, writing multiple "ol." is not as fast as to use the object initializer syntax. is there a better way?

Answer 1

You can have the constructor accept an object for which each of its properties get assigned to the instance with Object.assign:

type Init = {
    age: number;
    gender: string;
};
class Foo {
    public name: string;
    public age: number | undefined;
    public gender: string | undefined;
    constructor(name: string, init?: Partial<Init>) {
        this.name = name;
        if (init) {
          Object.assign(this, init);
        }
    }
}
const f = new Foo('bob', { age: 10 });

Answer 2

Adding this to the original answer ...

You can define init as the same type, i.e. Partial<Foo>

@RoutingKey('abc')
class Foo {
    public name: string | undefined;
    public age: number | undefined;
    public gender: string | undefined;
    constructor(init?: Partial<Foo>) {
        if (init) {
            Object.assign(this, init);
        }
    }
}

const foo = new Foo({ name: 'something' });

This was useful to me as I had to call new to get the constructor decorator @RoutingKey() to fire