All files model.mixin.js

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  import HtmlMarker from './html-marker.js'
export default function ModelMixin(Base) {
  return class Model extends Base {
 
    constructor() {
      super()
      this.model = this.defaultModel
      this.htmlMarker = new HtmlMarker(this.model)
    }
 
    get defaultModel() {
      return {}
    }
 
    updateModel(obj = {}) {
      const lastModelUpdates = {}
      Object.entries(obj).forEach(([prop, newValue]) => {
        if (this.model[prop] !== newValue) {
          lastModelUpdates[prop] = newValue
        }
      })
      Object.assign(this.model, obj)
      this.onModelUpdate(lastModelUpdates)
    }
 
    onModelUpdate() { }
 
  }
}