Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/KnownFragmentNamesRule.js

@@ -0,0 +1,36 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true,
+});
+exports.KnownFragmentNamesRule = KnownFragmentNamesRule;
+
+var _GraphQLError = require('../../error/GraphQLError.js');
+
+/**
+ * Known fragment names
+ *
+ * A GraphQL document is only valid if all `...Fragment` fragment spreads refer
+ * to fragments defined in the same document.
+ *
+ * See https://spec.graphql.org/draft/#sec-Fragment-spread-target-defined
+ */
+function KnownFragmentNamesRule(context) {
+  return {
+    FragmentSpread(node) {
+      const fragmentName = node.name.value;
+      const fragment = context.getFragment(fragmentName);
+
+      if (!fragment) {
+        context.reportError(
+          new _GraphQLError.GraphQLError(
+            `Unknown fragment "${fragmentName}".`,
+            {
+              nodes: node.name,
+            },
+          ),
+        );
+      }
+    },
+  };
+}