Fix smoke tests.

webpack.config.js

@@ -73,7 +73,7 @@ class LodashTemplatePlugin {
   }
 }
 
-module.exports = {
+const config = {
   entry: {
     lobby: path.join(__dirname, "src", "lobby.js"),
     room: path.join(__dirname, "src", "room.js"),
@@ -201,3 +201,30 @@ module.exports = {
     })
   ]
 };
+
+module.exports = () => {
+  if (process.env.GENERATE_SMOKE_TESTS && process.env.BASE_ASSETS_PATH) {
+    const smokeConfig = Object.assign({}, config, {
+      // Set the public path for to point to the correct assets on the smoke-test build.
+      output: Object.assign({}, config.output, {
+        publicPath: process.env.BASE_ASSETS_PATH.replace("://", "://smoke-")
+      }),
+      // For this config
+      plugins: config.plugins.map(plugin => {
+        if (plugin instanceof HTMLWebpackPlugin) {
+          return new HTMLWebpackPlugin(
+            Object.assign({}, plugin.options, {
+              filename: "smoke-" + plugin.options.filename
+            })
+          );
+        }
+
+        return plugin;
+      })
+    });
+
+    return [config, smokeConfig];
+  } else {
+    return config;
+  }
+};