Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/ScalarLeafsRule.d.ts

@@ -0,0 +1,9 @@
+import type { ASTVisitor } from '../../language/visitor';
+import type { ValidationContext } from '../ValidationContext';
+/**
+ * Scalar leafs
+ *
+ * A GraphQL document is valid only if all leaf fields (fields without
+ * sub selections) are of scalar or enum types.
+ */
+export declare function ScalarLeafsRule(context: ValidationContext): ASTVisitor;