OverlappingFieldsCanBeMergedRule: simplify argument comparison

src/validation/rules/OverlappingFieldsCanBeMergedRule.ts

@@ -588,12 +588,8 @@ function findConflict(
       ];
     }
 
-    // FIXME https://github.com/graphql/graphql-js/issues/2203
-    const args1 = /* c8 ignore next */ node1.arguments ?? [];
-    const args2 = /* c8 ignore next */ node2.arguments ?? [];
-
     // Two field calls must have the same arguments.
-    if (!sameArguments(args1, args2)) {
+    if (stringifyArguments(node1) !== stringifyArguments(node2)) {
       return [
         [responseName, 'they have differing arguments'],
         [node1],
@@ -639,26 +635,19 @@ function findConflict(
   }
 }
 
-function sameArguments(
-  arguments1: ReadonlyArray<ArgumentNode>,
-  arguments2: ReadonlyArray<ArgumentNode>,
-): boolean {
-  if (arguments1.length !== arguments2.length) {
-    return false;
-  }
-  return arguments1.every((argument1) => {
-    const argument2 = arguments2.find(
-      (argument) => argument.name.value === argument1.name.value,
-    );
-    if (!argument2) {
-      return false;
-    }
-    return stringifyValue(argument1.value) === stringifyValue(argument2.value);
-  });
-}
-
-function stringifyValue(value: ValueNode): string {
-  return print(sortValueNode(value));
+function stringifyArguments(fieldNode: FieldNode): string {
+  // FIXME https://github.com/graphql/graphql-js/issues/2203
+  const args = /* c8 ignore next */ fieldNode.arguments ?? [];
+
+  const inputObjectWithArgs = {
+    kind: Kind.OBJECT,
+    fields: args.map((argNode) => ({
+      kind: Kind.OBJECT_FIELD,
+      name: argNode.name,
+      value: argNode.value,
+    })),
+  };
+  return print(sortValueNode(inputObjectWithArgs));
 }
 
 // Two types conflict if both types could not apply to a value simultaneously.