only pass reference of contextValue to field resolvers

Author: joonlabs

src/Execution/ExecutionContext.php

@@ -19,7 +19,7 @@ public function __construct(
         Schema $schema,
         array $fragments,
         $rootValue,
-        $contextValue,
+        array $contextValue,
         $operation,
         $variableValues,
         $fieldResolver,
@@ -104,7 +104,7 @@ public function setRootValue($rootValue)
     /**
      * @return mixed
      */
-    public function getContextValue()
+    public function &getContextValue()
     {
         return $this->contextValue;
     }

src/Execution/Executor.php

@@ -211,7 +211,7 @@ public function resolveField(ExecutionContext $executionContext, GraphQLObjectTy
         try {
             $args = Values::getArgumentValues($fieldDef, $fieldNodes[0], $executionContext->getVariableValues());
 
-            $contextValue = $executionContext->getContextValue();
+            $contextValue = &$executionContext->getContextValue();
 
             $result = $resolveFn($source, $args, $contextValue, $info);
 
@@ -520,6 +520,9 @@ public function buildExecutionContext(Schema $schema, array $document, $rootValu
         $variableDefinitions = $operation["variableDefinitions"] ?? [];
         $coercedVariableValues = Values::getVariableValues($schema, $variableDefinitions, $rawVariableValues ?? []);
 
+        // default $contextValue to an empty array
+        $contextValue = $contextValue ?? [];
+        
         return new ExecutionContext(
             $schema,
             $fragments,