flow like the river

BACK_BACK/node_modules/graphql/validation/rules/KnownDirectivesRule.d.ts

@@ -0,0 +1,12 @@
+import { ASTVisitor } from '../../language/visitor';
+import { ValidationContext, SDLValidationContext } from '../ValidationContext';
+
+/**
+ * Known directives
+ *
+ * A GraphQL document is only valid if all `@directives` are known by the
+ * schema and legally positioned.
+ */
+export function KnownDirectivesRule(
+  context: ValidationContext | SDLValidationContext,
+): ASTVisitor;