add eslint ignore as there was before

Author: JoviDeCroock

src/jsutils/instanceOf.ts

@@ -1,6 +1,11 @@
 import { inspect } from './inspect';
 
-const isProduction = typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'production';
+/* c8 ignore next 4 */
+// eslint-disable-next-line no-undef
+const isProduction =
+  typeof process !== 'undefined' &&
+  process.env &&
+  process.env.NODE_ENV === 'production';
 
 /**
  * A replacement for instanceof which includes an error warning when multi-realm