perf: Reduce runtime prototype traversal for hasOwnProperty (enisdenj…

…o#52)

src/utils.ts

@@ -5,6 +5,9 @@
  */
 import { GraphQLError } from 'graphql';
 
+// Extremely small optimisation, reduces runtime prototype traversal
+const baseHasOwnProperty = Object.prototype.hasOwnProperty;
+
 export function isObject(val: unknown): val is Record<PropertyKey, unknown> {
   return typeof val === 'object' && val !== null;
 }
@@ -29,31 +32,26 @@ export function hasOwnProperty<
   O extends Record<PropertyKey, unknown>,
   P extends PropertyKey
 >(obj: O, prop: P): obj is O & Record<P, unknown> {
-  return Object.prototype.hasOwnProperty.call(obj, prop);
+  return baseHasOwnProperty.call(obj, prop);
 }
 
 export function hasOwnObjectProperty<
   O extends Record<PropertyKey, unknown>,
   P extends PropertyKey
 >(obj: O, prop: P): obj is O & Record<P, Record<PropertyKey, unknown>> {
-  return Object.prototype.hasOwnProperty.call(obj, prop) && isObject(obj[prop]);
+  return baseHasOwnProperty.call(obj, prop) && isObject(obj[prop]);
 }
 
 export function hasOwnArrayProperty<
   O extends Record<PropertyKey, unknown>,
   P extends PropertyKey
 >(obj: O, prop: P): obj is O & Record<P, unknown[]> {
-  return (
-    Object.prototype.hasOwnProperty.call(obj, prop) && Array.isArray(obj[prop])
-  );
+  return baseHasOwnProperty.call(obj, prop) && Array.isArray(obj[prop]);
 }
 
 export function hasOwnStringProperty<
   O extends Record<PropertyKey, unknown>,
   P extends PropertyKey
 >(obj: O, prop: P): obj is O & Record<P, string> {
-  return (
-    Object.prototype.hasOwnProperty.call(obj, prop) &&
-    typeof obj[prop] === 'string'
-  );
+  return baseHasOwnProperty.call(obj, prop) && typeof obj[prop] === 'string';
 }