only require babel register on dev

index.js

@@ -1,30 +1,32 @@
 const path = require("path");
 const dirPath = path.join(__dirname);
 
-require("@babel/register")({
-  presets: [
-    [require.resolve("@babel/preset-env")],
-    [
-      require.resolve("next/babel"),
-      {
-        "preset-env": {},
-        "transform-runtime": {},
-        "styled-jsx": {},
-        "class-properties": {},
-      },
-    ],
-  ],
-  plugins: [
-    [
-      require.resolve("babel-plugin-module-resolver"),
-      {
-        alias: {
-          "~": dirPath,
+if (process.env.NODE_ENV !== "production") {
+  require("@babel/register")({
+    presets: [
+      [require.resolve("@babel/preset-env")],
+      [
+        require.resolve("next/babel"),
+        {
+          "preset-env": {},
+          "transform-runtime": {},
+          "styled-jsx": {},
+          "class-properties": {},
         },
-      },
+      ],
     ],
-  ],
-  ignore: ["node_modules", ".next"],
-});
+    plugins: [
+      [
+        require.resolve("babel-plugin-module-resolver"),
+        {
+          alias: {
+            "~": dirPath,
+          },
+        },
+      ],
+    ],
+    ignore: ["node_modules", ".next"],
+  });
+}
 
 module.exports = require("./server.js");

scripts/index.js

@@ -1,10 +1,10 @@
 if (process.env.NODE_ENV !== "production") {
   require("dotenv").config();
+
+  require("@babel/register")({
+    presets: ["@babel/preset-env"],
+    ignore: ["node_modules", ".next"],
+  });
 }
 
-require("@babel/register")({
-  presets: ["@babel/preset-env"],
-  ignore: ["node_modules", ".next"],
-});
-
 module.exports = require("./" + process.argv[2] + ".js");