module-examples/top-level-await/modules/canvas.js

class Canvas {
  constructor(id, parent, width, height) {
    this.id = id;
    this.listId = null;
    this.parent = parent;
    this.width = width;
    this.height = height;
    this.ctx = null;
  }

  // new class stuff above here

  create() {
    if(this.ctx !== null) {
      console.log('Canvas already created!');
      return;
    } else {
      let divWrapper = document.createElement('div');
      let canvasElem = document.createElement('canvas');
      this.parent.appendChild(divWrapper);
      divWrapper.appendChild(canvasElem);

      divWrapper.id = this.id;
      canvasElem.width = this.width;
      canvasElem.height = this.height;

      this.ctx = canvasElem.getContext('2d');
    }
  }

  createReportList() {
    if(this.listId !== null) {
      console.log('Report list already created!');
      return;
    } else {
      let list = document.createElement('ul');
      list.id = this.id + '-reporter';

      let canvasWrapper = document.getElementById(this.id);
      canvasWrapper.appendChild(list);

      this.listId = list.id;
    }
  }
}

export { Canvas };