Can't get Composition to work

I’m getting the following error, but I don’t know why: @jsonMember on Person.anotherClass: ReflectDecorators is required if no 'constructor' option is specified.

Here’s the example, where I am trying to use composition. Based on the tests, I added the knownTypes, but it’s still not working:

import { jsonObject, jsonMember, jsonArrayMember, TypedJSON } from "typedjson";
import "reflect-metadata";

@jsonObject()
class AnotherClass {
  private _arr: Array<string> = ["str1", "str2"];

  constructor() {}

  @jsonArrayMember(String)
  get arr(): Array<string> {
    return this._arr;
  }

  set arr(arr: Array<string>) {
    this._arr = arr;
  }

  methodB(): string {
    return "something";
  }
}

@jsonObject({
  knownTypes: [AnotherClass]
})
class Person {
  constructor(name?: string) {
    this._name = name || "some default name";
  }

  private _name: string;

  @jsonMember
  public anotherClass: AnotherClass = new AnotherClass();

  @jsonMember({ constructor: String })
  get name() {
    return this._name;
  }

  set name(name: string) {
    this._name = name;
  }

  static testSerialization() {
    let serializer = new TypedJSON(Person);
    let object = new Person("LLP");

    console.log("original", object);

    let json = serializer.stringify(object);

    console.log(json);

    let object2 = serializer.parse(json);

    console.log("restored", object2);

    console.log("instance of", object2 instanceof Person); // true
  }

  get lang() {
    return "JavaScript";
  }
}

I have installed reflect-metadata both locally and globally, but doesn’t seem to affect the result.

Any ideas? thanks!

[Neos3452]

Hey Apidcloud, you are right reflect-metadata is basically just to skip the need to type a constructor every time. It is completely optional.

Funny thing, in typescript compiler there is a big if statement that changes the format of emitted metadata which will break all the code that is using the current format. I am not sure how they are going to handle that since the present version is marked as experimental. Let’s just hope they will add a flag for that.

[Apidcloud]

Yeah, I don’t think the metadata is in the output. Couldn’t find those functions you mentioned before. How can I try this without the reflect-metadata? What else would I need to set?

It works with strings.

Edit: I think I was having some cache issues in the browser, as it is now working with arrays too. So the only downside is to specify constructor property in the jsonMembers? You can close the issue I think. I will reopen if I face any other issues!

Thank you for your time!