From ab93bf496ac46c704305e71fb1b83a337457eed0 Mon Sep 17 00:00:00 2001
From: Ivan Goncharov <ivan.goncharov.ua@gmail.com>
Date: Wed, 22 May 2019 18:17:01 +0300
Subject: [PATCH] findBreakingChanges: Correctly document not reachable
 statement (#1896)

---
 src/utilities/findBreakingChanges.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/utilities/findBreakingChanges.js b/src/utilities/findBreakingChanges.js
index c55dfad874..54b9ec2949 100644
--- a/src/utilities/findBreakingChanges.js
+++ b/src/utilities/findBreakingChanges.js
@@ -8,6 +8,7 @@
  */
 
 import find from '../polyfills/find';
+import inspect from '../jsutils/inspect';
 import {
   type GraphQLNamedType,
   type GraphQLFieldMap,
@@ -292,7 +293,10 @@ function typeKindName(type: GraphQLNamedType): string {
   if (isInputObjectType(type)) {
     return 'an Input type';
   }
-  throw new TypeError('Unknown type ' + type.constructor.name);
+
+  // Not reachable. All possible named types have been considered.
+  /* istanbul ignore next */
+  throw new TypeError(`Unexpected type: ${inspect((type: empty))}.`);
 }
 
 function findFieldsThatChangedTypeOnObjectOrInterfaceTypes(