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Configuration Types

Besides exporting a single config object, there are a few more ways that cover other needs as well.

Exporting a Function

Eventually you will find the need to disambiguate in your webpack.config.js between development and production builds. You have (at least) two options:

One option is to export a function from your webpack config instead of exporting an object. The function will be invoked with two arguments:

-module.exports = {
+module.exports = function(env, argv) {
+  return {
+    devtool: env.production ? 'source-maps' : 'eval',
     plugins: [
       new webpack.optimize.UglifyJsPlugin({
+        compress: argv['optimize-minimize'] // only if -p or --optimize-minimize were passed
+  };

Exporting a Promise

webpack will run the function exported by the configuration file and wait for a Promise to be returned. Handy when you need to asynchronously load configuration variables.

module.exports = () => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
        entry: './app.js',
        /* ... */
    }, 5000)

Exporting multiple configurations

Instead of exporting a single configuration object/function, you may export multiple configurations (multiple functions are supported since webpack 3.1.0). When running webpack, all configurations are built. For instance, this is useful for bundling a library for multiple targets such as AMD and CommonJS:

module.exports = [{
  output: {
    filename: './dist-amd.js',
    libraryTarget: 'amd'
  entry: './app.js',
}, {
  output: {
    filename: './dist-commonjs.js',
    libraryTarget: 'commonjs'
  entry: './app.js',