typescript optional property with a getter

As of April 2020, there is NO way to implement this.

There is an inconclusive PR for this: https://github.com/microsoft/TypeScript/pull/16344

A proposed solution via an interface is presented here: https://github.com/microsoft/TypeScript/pull/16344

Personally, the solution did not meet my needs, and I rather declared the property as private.

Hopefully, we can have better luck in the future.

Very interesting. I think, you should report an issue to TypeScript, because methods can be optional (see below), but property getters not. It is strange.. As a workaround I can suggest two variants. A nice one:

class PersonParms {
    name:string;
    lastName:string;
    age?: number;

    getFullName?() {return this.name + " "+this.lastName;}
}

And a second one, that is hacky, because there we make all the properties optional when passing to constructor.

class PersonParms {
    name:string;
    lastName:string;
    age?: number;

    get fullName(){return this.name + " "+this.lastName;}
}

class Person{
    constructor(prms: Partial<PersonParms>){
    }
}