code: function getEaseType(type){
    switch(type) {
      case KeyframeInterpolationType.BEZIER:
        return EASE_TYPE.BEZIER;
      break;
  
      case KeyframeInterpolationType.LINEAR:
        return EASE_TYPE.LINEAR;
      break;
  
      case KeyframeInterpolationType.HOLD:
        return EASE_TYPE.HOLD;
      break;
  
      default:
        throw new Error('unknown ease type');
      break;
    }
  }
docs: get ease type