silphius/app/ecs/components/ttl.js

import Component from '@/ecs/component.js';

export default class Ttl extends Component {
  instanceFromSchema() {
    const {ecs} = this;
    return class TtlInstance extends super.instanceFromSchema() {
      $$elapsed = 0;
      destroy() {
        this.$$elapsed = 0;
      }
      get elapsed() {
        return this.$$elapsed;
      }
      set elapsed(elapsed) {
        this.$$elapsed = elapsed;
      }
      tick(elapsed) {
        this.$$elapsed += elapsed;
        if (this.$$elapsed >= this.ttl) {
          ecs.destroy(this.entity);
        }
      }
    }
  }
  static properties = {
    ttl: {type: 'float32'},
  };
}