flow like the river

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

@@ -0,0 +1,34 @@
+"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: function Field(node) {
+      var 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 \"".concat(node.name.value, "\"."), node));
+      }
+    }
+  };
+}