Invalid configuration object when running npm run build with webpack 2.2.1

I don't know the details about migrating from webpack 1 to 2, but it seems that the "excludes" property that Isaac Lee puts in the webpack.config.js file at 3:32 in the video, changed to "exclude"(singular instead of plural). That small change made everything work for me.

webpack.config.js

var webpackConfig = {
  entry: "./src/index.js",
  output: {
    path: __dirname + "/build",
    filename: "index.js"
  },
  module: {
    loaders: [
        {
            loader: "babel-loader",
            test: /.js$/,
            exclude: /node_modules/
        } 
    ]
  }
};

module.exports = webpackConfig;

As of webpack 2.0, "loaders" should be renamed to "rules" and "excludes" should be "exclude". Check which version of webpack you installed by looking at your package.json file and change accordingly.

Best step is to view the webpack docs/guides: https://webpack.js.org/guides/ In case you've followed their docs in the past, rest assured, the docs in V2 are pretty well written ;)

Here are their steps for migrating: https://webpack.js.org/guides/migrating/