Webpack stopped transpiling React - reactjs

Question

I've been using WebPack v2.6.1 to transpile and bundle my react jsx code. I did not change anything. All of a sudden, WebPack stopped transpiling and bundling my React code for production.
Below is a part of the error messages I'm getting:
When I use webpack dev server, everything works perfectly fine. This is happening when I try to go to production. WebPack seems to be producing the bundled output files but when I try to pull up the page, they don't come up. I'm issuing the same webpack --env.process command I've always used. In the browser, this is the error I'm getting which is preventing my React component from displaying.
My webpack.config.js file is below. Any idea what's happening here?
var IS_DEV = false; // change to false if building production files
var webpack = require('webpack');
var path = require("path");
// Define plugins needed for production and dev cases
var _pluginsDev = [
new webpack.ProvidePlugin({
'fetch': 'imports-loader?this=>global!exports-loader?global.fetch!whatwg-fetch',
moment: 'moment',
ps: 'perfect-scrollbar'
}),
];
var _pluginsProd = [
new webpack.ProvidePlugin({
'fetch': 'imports-loader?this=>global!exports-loader?global.fetch!whatwg-fetch',
moment: 'moment',
ps: 'perfect-scrollbar'
}),
new webpack.DefinePlugin({ // Minimizer, removing multiple occurances of imports et.c
'process.env': {
'NODE_ENV': JSON.stringify('production')
}
}),
new webpack.optimize.UglifyJsPlugin({
minimize: true,
compress: true,
output: { comments: false }
})
];
var _devtool = IS_DEV ? 'eval' : 'cheap-module-source-map';
var _plugins = IS_DEV ? _pluginsDev : _pluginsProd;
var _fileName = IS_DEV ? "./build/[name]-bundle.js" : "./dist/[name]-bundle.js";
var _bundles = {
home: './UI/components/home/home.jsx',
accounts: './UI/components/accounts/accounts.jsx',
contacts: './UI/components/contacts/contacts.jsx',
projectsList: './UI/components/projects/projects_list/projectsList.jsx'
};
module.exports = {
entry: _bundles,
output: {
path: path.resolve(__dirname, "wwwroot"),
publicPath: "/",
filename: _fileName
},
devtool: _devtool,
plugins: _plugins,
module: {
rules: [
{
test: /\.jsx?$/,
exclude: /(node_modules|bower_components)/,
use: {
loader: "babel-loader",
options: {
presets: ['es2015', 'stage-2', 'stage-0', 'react']
}
}
}
]
},
resolve: {
extensions: ['.js', '.jsx']
}
}