enhance(tools): do not add _v prefix if there is only one

Author: ardatan

.changeset/grumpy-cows-burn.md

@@ -0,0 +1,5 @@
+---
+'@graphql-tools/utils': patch
+---
+
+Do not add `_v` prefix if there is only one argument/variable

packages/utils/src/index.ts

@@ -30,6 +30,7 @@ export * from './renameType.js';
 export * from './transformInputValue.js';
 export * from './mapAsyncIterator.js';
 export * from './updateArgument.js';
+export * from './astFromType.js';
 export * from './implementsAbstractType.js';
 export * from './errors.js';
 export * from './observableToAsyncIterable.js';

packages/utils/src/updateArgument.ts

@@ -57,7 +57,7 @@ export function createVariableNameGenerator(
   return (argName: string): string => {
     let varName: string;
     do {
-      varName = `_v${(varCounter++).toString()}_${argName}`;
+      varName = varCounter === 0 ? argName : `_v${(varCounter++).toString()}_${argName}`;
     } while (varName in variableDefinitionMap);
     return varName;
   };