reduce collission

Author: JoviDeCroock

src/utilities/substituteFragmentArguments.ts

@@ -54,14 +54,14 @@ export function fragmentArgumentSubstitutions(
   }
 
   for (const variableDefinition of variableDefinitions) {
-    const argumentName = variableDefinition.variable.name.value;
-    if (substitutions.has(argumentName)) {
+    const variableName = variableDefinition.variable.name.value;
+    if (substitutions.has(variableName)) {
       continue;
     }
 
     const defaultValue = variableDefinition.defaultValue;
     if (defaultValue) {
-      substitutions.set(argumentName, defaultValue);
+      substitutions.set(variableName, defaultValue);
     } else {
       // We need a way to allow unset arguments without accidentally
       // replacing an unset fragment argument with an operation
@@ -72,9 +72,9 @@ export function fragmentArgumentSubstitutions(
       //    - make unset fragment arguments invalid
       // Requiring the spread to pass all non-default-defined arguments is nice,
       // but makes field argument default values impossible to use.
-      substitutions.set(argumentName, {
+      substitutions.set(variableName, {
         kind: Kind.VARIABLE,
-        name: { kind: Kind.NAME, value: '__UNSET' },
+        name: { kind: Kind.NAME, value: variableName + '__UNSET' },
       });
     }
   }