Avoid allocating new arrays when computing updated value in variables

Co-authored-by: Ben Newman <[email protected]>

Author: jerelmiller

src/link/remove-typename/removeTypenameFromVariables.ts

@@ -43,16 +43,17 @@ function maybeStripTypenameUsingConfig(
   const variableDefinitions = getVariableDefinitions(query);
 
   return Object.fromEntries(
-    Object.entries(variables).map(([key, value]) => {
+    Object.entries(variables).map(keyVal => {
+      const [key, value] = keyVal;
       const typename = variableDefinitions[key];
       const typenameConfig = config[typename];
 
-      return [
-        key,
-        typenameConfig
+      keyVal[1] = typenameConfig
           ? maybeStripTypename(value, typenameConfig)
-          : stripTypename(value),
-      ];
+          : stripTypename(value);
+      
+      return keyVal;
+    });
     })
   );
 }