[Bug]: MapSchema does not works without any @type

[Andrek25]

Bug description

In v2.0 we can have a MapSchema without any @type but it's not working for v3.0, i know there is not sense to have a Schema if you won't sync any data, but i was using it because in future i'll sync some data.

This is a problem in v3.0 so the stackblitz project won't fail, there is a example code:

export class MySchema extends Schema {
}

export class MyRoomState extends Schema {
  @type({ map: MySchema }) mySchema: MapSchema<MySchema> = new MapSchema<MySchema>();
}

export class MyRoom extends Room<MyRoomState> {
  onJoin() {
    this.state.mySchema.set('foo', new MySchema()); // <- Fail
  }
}

To make this example to work i just need to remove @type({ map: MySchema }).

Optional: Minimal reproduction

There is not a stackblitz project with v3.0

Here is an image to track the error:

[endel]

Thank you for reporting @Andrek25 - Just fixed it on @colyseus/[email protected] 🙌