diff --git a/babel.client.config.js b/babel.client.config.js
new file mode 100644
index 0000000..3de8f70
--- /dev/null
+++ b/babel.client.config.js
@@ -0,0 +1,14 @@
+const common = require('./babel.common.config');
+
+module.exports = function(api) {
+  const config = common(api);
+  // Presets.
+  config.presets.push('@babel/preset-react');
+  config.presets.push('@babel/preset-env');
+  // Plugins.
+  config.plugins.push('@babel/plugin-proposal-object-rest-spread');
+  if (process.argv.find((arg) => '--hot' === arg)) {
+    config.plugins.push('react-hot-loader/babel');
+  }
+  return config;
+}
diff --git a/babel.common.config.js b/babel.common.config.js
new file mode 100644
index 0000000..5da11a5
--- /dev/null
+++ b/babel.common.config.js
@@ -0,0 +1,9 @@
+module.exports = function (api) {
+  api.cache(true);
+  const presets = [];
+  const plugins = [];
+  return {
+    presets,
+    plugins
+  };
+}
diff --git a/babel.config.js b/babel.config.js
deleted file mode 100644
index e8f732b..0000000
--- a/babel.config.js
+++ /dev/null
@@ -1,19 +0,0 @@
-module.exports = function (api) {
-  api.cache(true);
-
-  const presets = [
-    '@babel/preset-react',
-    '@babel/preset-env',
-  ];
-  const plugins = [
-    '@babel/plugin-proposal-object-rest-spread',
-  ];
-  if (process.argv.find((arg) => '--hot' === arg)) {
-    plugins.push('react-hot-loader/babel');
-  }
-
-  return {
-    presets,
-    plugins
-  };
-}
diff --git a/babel.server.config.js b/babel.server.config.js
new file mode 100644
index 0000000..3495972
--- /dev/null
+++ b/babel.server.config.js
@@ -0,0 +1,15 @@
+const common = require('./babel.common.config');
+
+module.exports = function(api) {
+  const config = common(api);
+  // Presets.
+  config.presets.push([
+    '@babel/preset-env',
+    {
+      targets: {
+        node: 'current',
+      },
+    },
+  ]);
+  return config;
+}
diff --git a/package.json b/package.json
index 3866000..14254fd 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,12 @@
   "version": "1.0.0",
   "author": "cha0s",
   "license": "MIT",
+  "browserslist": [
+    "last 1 version",
+    "> 1%",
+    "maintained node versions",
+    "not dead"
+  ],
   "devDependencies": {
     "@babel/core": "7.3.4",
     "@babel/plugin-proposal-object-rest-spread": "7.3.4",
diff --git a/webpack.client.config.js b/webpack.client.config.js
index f2ec55a..2adbc38 100644
--- a/webpack.client.config.js
+++ b/webpack.client.config.js
@@ -36,6 +36,10 @@ config.devServer = {
   watchContentBase: true,
 };
 config.devtool = 'eval-source-map';
+// Babel config file.
+config.module.rules[0].use.options.configFile = path.resolve(
+  __dirname, 'babel.client.config.js'
+);
 config.module.rules[1].use.options.paths.push(
   path.resolve(__dirname, 'client'),
 );
diff --git a/webpack.common.config.js b/webpack.common.config.js
index b1ad7e0..dba6c61 100644
--- a/webpack.common.config.js
+++ b/webpack.common.config.js
@@ -15,6 +15,7 @@ const config = {
         ],
         use: {
           loader: 'babel-loader',
+          options: {},
         },
       },
       {
diff --git a/webpack.server.config.js b/webpack.server.config.js
index 9484511..f6c51ce 100644
--- a/webpack.server.config.js
+++ b/webpack.server.config.js
@@ -24,6 +24,10 @@ config.externals = [
     whitelist: /(?:@avocado|webpack\/hot\/signal)/,
   }),
 ];
+// Babel config file.
+config.module.rules[0].use.options.configFile = path.resolve(
+  __dirname, 'babel.server.config.js'
+);
 config.module.rules[1].use.options.paths.push(
   path.resolve(__dirname, 'server'),
 );