How to use the mapv.baiduMapLayer.__proto__ function in mapv

/* Copyright© 2000 - 2019 SuperMap Software Co.Ltd. All rights reserved.
 * This program are made available under the terms of the Apache License, Version 2.0
 * which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
import ol from 'openlayers';
import {
    MapvCanvasLayer
} from './MapvCanvasLayer';
import {
    baiduMapLayer
} from "mapv";

var BaiduMapLayer = baiduMapLayer ? baiduMapLayer.__proto__ : Function;

/**
 * @class MapvLayer
 * @classdesc MapV 图层类。
 * @private
 * @param {Object} map - 地图。
 * @param {Mapv.DataSet} [dataSet] - 数据集。
 * @param {Object} options - 参数。
 * @param {number} mapWidth - 地图宽度。
 * @param {number} mapHeight - 地图高度。
 * @param {Object} source - 资源。
 * @param {number} options.width - 画布宽。
 * @param {number} options.height - 画布高。
 * @param {string} [options.paneName='mapPane'] - 窗口名。
 * @param {string} [options.context] - 内容。
 * @param {number} [options.zIndex] - 层级。

/* Copyright© 2000 - 2019 SuperMap Software Co.Ltd. All rights reserved.
 * This program are made available under the terms of the Apache License, Version 2.0
 * which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
import L from 'leaflet';
import { baiduMapLayer } from 'mapv';
import { getMeterPerMapUnit } from '../../core/Util';

var BaseLayer = baiduMapLayer ? baiduMapLayer.__proto__ : Function;

/**
 * @class L.supermap.MapVRenderer
 * @classdesc 地图渲染类。
 * @category Visualization MapV
 * @private
 * @extends mapv.BaseLayer
 * @param {L.Map} map - 待渲染的地图。
 * @param {L.Layer} layer - 待渲染的图层。
 * @param {DataSet} dataSet - 待渲染的数据集。
 * @param {Object} options - 渲染的参数。
 */
export class MapVRenderer extends BaseLayer {

    constructor(map, layer, dataSet, options) {
        super(map, dataSet, options);

/* Copyright© 2000 - 2019 SuperMap Software Co.Ltd. All rights reserved.
 * This program are made available under the terms of the Apache License, Version 2.0
 * which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
import { baiduMapLayer } from 'mapv';
import mapboxgl from 'mapbox-gl';
import { getMeterPerMapUnit } from '@supermap/iclient-common';

var BaseLayer = baiduMapLayer ? baiduMapLayer.__proto__ : Function;

/**
 * @private
 * @class MapvRenderer
 * @classdesc MapV图层渲染。
 * @param {Object} map - 地图。
 * @param {Object} layer - 图层。
 * @param {MapV.DataSet} dataSet - 数据集。
 * @param {Object} options - 交互时所需可选参数。
 * @extends {MapV.BaseLayer}
 *
 */
export class MapvRenderer extends BaseLayer {
    constructor(map, layer, dataSet, options) {
        super(map, dataSet, options);
        if (!BaseLayer) {

* which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
import {SuperMap} from '../../SuperMap';
import {baiduMapLayer, DataSet} from 'mapv';
import { getMeterPerMapUnit } from '@supermap/iclient-common';

/**
 * @class MapVRenderer
 * @classdesc MapV渲染器。
 * @private
 * @extends {mapv.baiduMapLayer}
 * @param {SuperMap.Map} map - 待渲染的地图。
 * @param {SuperMap.Layer.MapVLayer} layer - 待渲染的图层。
 * @param {Mapv.DataSet} dataSet - 待渲染的数据集，数据所属坐标系要求与 map 保持一致。
 * @param {Object} options - 渲染的参数。
 */
var MapVBaseLayer = baiduMapLayer ? baiduMapLayer.__proto__ : Function;

export class MapVRenderer extends MapVBaseLayer {
    constructor(map, layer, dataSet, options) {
        super(map, dataSet, options);
        if (!MapVBaseLayer) {
            return this;
        }

        var self = this;
        options = options || {};

        self.init(options);
        self.argCheck(options);
        this.canvasLayer = layer;
        this.clickEvent = this.clickEvent.bind(this);
        this.mousemoveEvent = this.mousemoveEvent.bind(this);