Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/ExecutableDefinitionsRule.mjs

@@ -0,0 +1,34 @@
+import { GraphQLError } from '../../error/GraphQLError.mjs';
+import { Kind } from '../../language/kinds.mjs';
+import { isExecutableDefinitionNode } from '../../language/predicates.mjs';
+
+/**
+ * Executable definitions
+ *
+ * A GraphQL document is only valid for execution if all definitions are either
+ * operation or fragment definitions.
+ *
+ * See https://spec.graphql.org/draft/#sec-Executable-Definitions
+ */
+export function ExecutableDefinitionsRule(context) {
+  return {
+    Document(node) {
+      for (const definition of node.definitions) {
+        if (!isExecutableDefinitionNode(definition)) {
+          const defName =
+            definition.kind === Kind.SCHEMA_DEFINITION ||
+            definition.kind === Kind.SCHEMA_EXTENSION
+              ? 'schema'
+              : '"' + definition.name.value + '"';
+          context.reportError(
+            new GraphQLError(`The ${defName} definition is not executable.`, {
+              nodes: definition,
+            }),
+          );
+        }
+      }
+
+      return false;
+    },
+  };
+}