diff --git a/bin/elm-app-cli.js b/bin/elm-app-cli.js
index 40a8eaf1..a9e4d5c9 100755
--- a/bin/elm-app-cli.js
+++ b/bin/elm-app-cli.js
@@ -78,12 +78,15 @@ switch (script) {
  * @return {undefined}
  */
 function help(version) {
-  console.log('\nUsage: elm-app <command>\n');
+  console.log();
+  console.log('Usage: elm-app <command>');
+  console.log();
   console.log('where <command> is one of:');
-  console.log(
-    '    build, start, test, eject, ' + elmCommands.join(', ') + '\n'
-  );
-  console.log('\nElm ' + elmVersion + '\n');
+  console.log('    build, start, test, eject, ' + elmCommands.join(', '));
+  console.log();
+  console.log();
+  console.log('Elm ' + elmVersion);
+  console.log();
   console.log(
     'create-elm-app@' + version + ' ' + path.resolve(__dirname, '..')
   );
diff --git a/config/paths.js b/config/paths.js
index b84c7343..d0dc96ba 100644
--- a/config/paths.js
+++ b/config/paths.js
@@ -15,6 +15,9 @@ const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
 const explorer = cosmiconfig('elmapp');
 const result = explorer.searchSync(appDirectory);
 const config = result ? result.config : loadElmJson();
+const id = x => x;
+const configureWebpack =
+  typeof config.configureWebpack === 'function' ? config.configureWebpack : id;
 
 // WARNING:
 // We support config in elm.json only for legacy reasons.
@@ -76,5 +79,6 @@ module.exports = {
   elm: require.resolve('elm/bin/elm'),
   publicUrl: getPublicUrl(config),
   servedPath: getServedPath(config),
-  proxy: config.proxy
+  proxy: config.proxy,
+  configureWebpack
 };
diff --git a/scripts/build.js b/scripts/build.js
index 0662703a..fa0662f6 100644
--- a/scripts/build.js
+++ b/scripts/build.js
@@ -94,7 +94,9 @@ function build(previousFileSizes) {
     console.log(`Creating an optimized ${process.env.NODE_ENV} build...`);
   }
 
-  const compiler = webpack(config);
+  const compiler = webpack(
+    paths.configureWebpack(config, process.env.NODE_ENV)
+  );
   return new Promise((resolve, reject) => {
     compiler.run((err, stats) => {
       if (err) {
diff --git a/scripts/eject.js b/scripts/eject.js
index e5a9d94b..f4bd1a24 100644
--- a/scripts/eject.js
+++ b/scripts/eject.js
@@ -82,12 +82,14 @@ function performEject(pkg) {
   // Update or create new package.json
   fs.writeFileSync('package.json', JSON.stringify(pkg, null, 2));
 
-  console.log('\nPlease wait for npm to install all required dependencies...');
+  console.log();
+  console.log('Please wait for npm to install all required dependencies...');
 
   // Install npm packages
   spawn.sync('npm', ['install'], { stdio: 'inherit' });
 
-  console.log(chalk.green('\nEjected successfully!'));
+  console.log();
+  console.log(chalk.green('Ejected successfully!'));
 }
 
 // The following dependencies will be removed:
diff --git a/scripts/start.js b/scripts/start.js
index cc8b160b..fccb32da 100644
--- a/scripts/start.js
+++ b/scripts/start.js
@@ -160,7 +160,12 @@ choosePort(HOST, DEFAULT_PORT)
     const appName = path.basename(path.dirname(paths.elmJson));
     const urls = prepareUrls(protocol, HOST, port);
     // Create a webpack compiler that is configured with custom messages.
-    const compiler = createCompiler(webpack, config, appName, urls);
+    const compiler = createCompiler(
+      webpack,
+      paths.configureWebpack(config, process.env.NODE_ENV),
+      appName,
+      urls
+    );
     // Load proxy config
     const proxyConfig = prepareProxy(paths.proxy, paths.appPublic);
     // Serve webpack assets generated by the compiler over a web sever.