From 5f8e795d788929f605f830cdb68abdc0f984145f Mon Sep 17 00:00:00 2001
From: Christoph Zwerschke <cito@online.de>
Date: Sat, 14 Sep 2019 18:43:08 +0200
Subject: [PATCH] Make onError optional in SDLValidationContext

---
 src/validation/ValidationContext.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/validation/ValidationContext.js b/src/validation/ValidationContext.js
index a3a7bd0f08..19e3bd604d 100644
--- a/src/validation/ValidationContext.js
+++ b/src/validation/ValidationContext.js
@@ -149,7 +149,7 @@ export class SDLValidationContext extends ASTValidationContext {
   constructor(
     ast: DocumentNode,
     schema: ?GraphQLSchema,
-    onError: (err: GraphQLError) => void,
+    onError?: (err: GraphQLError) => void,
   ): void {
     super(ast, onError);
     this._schema = schema;