fix: convert resolveConfig default export to named function for webpack/babel compatibility (#10891)

Co-authored-by: Jay <jasonsaayman@gmail.com>

lib/helpers/resolveConfig.js

@@ -35,7 +35,7 @@ const encodeUTF8 = (str) =>
     String.fromCharCode(parseInt(hex, 16))
   );
 
-export default (config) => {
+function resolveConfig(config) {
   const newConfig = mergeConfig({}, config);
 
   // Read only own properties to prevent prototype pollution gadgets
@@ -103,4 +103,6 @@ export default (config) => {
   }
 
   return newConfig;
-};
+}
+
+export default resolveConfig;