Initialisation

Added the packages and files for the backend server

node_modules/graphql/validation/rules/custom/NoSchemaIntrospectionCustomRule.js

@@ -0,0 +1,41 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true,
+});
+exports.NoSchemaIntrospectionCustomRule = NoSchemaIntrospectionCustomRule;
+
+var _GraphQLError = require('../../../error/GraphQLError.js');
+
+var _definition = require('../../../type/definition.js');
+
+var _introspection = require('../../../type/introspection.js');
+
+/**
+ * Prohibit introspection queries
+ *
+ * A GraphQL document is only valid if all fields selected are not fields that
+ * return an introspection type.
+ *
+ * Note: This rule is optional and is not part of the Validation section of the
+ * GraphQL Specification. This rule effectively disables introspection, which
+ * does not reflect best practices and should only be done if absolutely necessary.
+ */
+function NoSchemaIntrospectionCustomRule(context) {
+  return {
+    Field(node) {
+      const type = (0, _definition.getNamedType)(context.getType());
+
+      if (type && (0, _introspection.isIntrospectionType)(type)) {
+        context.reportError(
+          new _GraphQLError.GraphQLError(
+            `GraphQL introspection has been disabled, but the requested query contained the field "${node.name.value}".`,
+            {
+              nodes: node,
+            },
+          ),
+        );
+      }
+    },
+  };
+}