avocado-old/packages/entity/traits/layered.trait.js

import {Trait} from '../trait';

export class Layered extends Trait {

  initialize() {
    this._layer = undefined;
  }

  destroy() {
    delete this._layer;
    this.entity.emit('removedFromLayer');
  }

  get layer() {
    return this._layer;
  }

  set layer(layer) {
    this._layer = layer;
    this.entity.emit('addedToLayer');
  }

}