Openlayers继承了通过webpack中的填充加载的自定义控件中未定义的方法

Question

我尝试在我的项目中包含LayerSwitcher Custom Control和webpack，但我总是收到ol.inhereits在此行中未定义的错误：

ol.inherits(ol.control.LayerSwitcher, ol.control.Control);

https://github.com/Viglino/ol3-ext/blob/ddc2f631348f8b1cfb5d24e8cf83ed13c262411d/dist/ol3-ext.js#L94

我已经在firefox 57中调试了这个（见截图），虽然模块已初始化/导入，但我不知道为什么找不到该方法。   遗失了什么吗？

我的webpack配置如下：

const path = require('path');
var webpack = require("webpack");
module.exports = {
    entry: './index.js',
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist'),
        libraryTarget: 'var',
        library: 'IndexJS'
    },
    devtool: 'source-map',
    module: {
        loaders: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loader: "babel-loader",
                query: {
                    presets: ['env']
                }
            }
        ],
        rules: [
        {
                test: require.resolve("./ol3-ext-1.0.1/dist/ol3-ext.js"),
                loader: "imports-loader?$=jquery,ol=ol,ol.control=ol/control"
            },
            {
                test: require.resolve("./ol3-ext-1.0.1/dist/ol3-ext.js"),
                loader: "exports-loader?LayerSwitcher=LayerSwitcher,LayerPopup=LayerPopup"
            }

        ]