diff --git a/extension/webpack/prod.config.babel.js b/extension/webpack/prod.config.babel.js
index ff04e735..a00daf7b 100644
--- a/extension/webpack/prod.config.babel.js
+++ b/extension/webpack/prod.config.babel.js
@@ -1,7 +1,7 @@
 import path from 'path';
 import baseConfig from './base.config';
 
-export default baseConfig({
+const config = baseConfig({
   mode: 'production',
   inputExtra: {
     page: [path.join(__dirname, '../src/browser/extension/inject/pageScript')],
@@ -18,3 +18,5 @@ export default baseConfig({
     '../src/browser/extension/manifest.json'
   ),
 });
+
+export default config;
diff --git a/extension/webpack/prod.firefox.config.babel.js b/extension/webpack/prod.firefox.config.babel.js
index 54fdf8b9..08611e43 100644
--- a/extension/webpack/prod.firefox.config.babel.js
+++ b/extension/webpack/prod.firefox.config.babel.js
@@ -1,7 +1,7 @@
 import path from 'path';
 import baseConfig from './base.config';
 
-export default baseConfig({
+const config = baseConfig({
   mode: 'production',
   output: { path: path.join(__dirname, '../build/extension') },
   globals: {
@@ -15,3 +15,5 @@ export default baseConfig({
     '../src/browser/firefox/manifest.json'
   ),
 });
+
+export default config;
diff --git a/extension/webpack/wrap.config.babel.js b/extension/webpack/wrap.config.babel.js
index 25b57d11..3e273c5a 100644
--- a/extension/webpack/wrap.config.babel.js
+++ b/extension/webpack/wrap.config.babel.js
@@ -1,7 +1,7 @@
 import path from 'path';
 import baseConfig from './base.config';
 
-export default baseConfig({
+const config = baseConfig({
   mode: 'production',
   input: {
     page: [path.join(__dirname, '../src/browser/extension/inject/pageScript')],
@@ -13,3 +13,5 @@ export default baseConfig({
     },
   },
 });
+
+export default config;