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11 changes: 10 additions & 1 deletion src/jsutils/instanceOf.ts
Original file line number Diff line number Diff line change
@@ -1,5 +1,14 @@
import { inspect } from './inspect';

/* c8 ignore next 4 */
const isProduction =
// eslint-disable-next-line no-undef
typeof process !== 'undefined' &&
// eslint-disable-next-line no-undef
process.env &&
// eslint-disable-next-line no-undef
process.env.NODE_ENV === 'production';

/**
* A replacement for instanceof which includes an error warning when multi-realm
* constructors are detected.
Expand All @@ -9,7 +18,7 @@ import { inspect } from './inspect';
export const instanceOf: (value: unknown, constructor: Constructor) => boolean =
/* c8 ignore next 6 */
// FIXME: https://github.com/graphql/graphql-js/issues/2317
globalThis.process && globalThis.process.env.NODE_ENV === 'production'
isProduction
? function instanceOf(value: unknown, constructor: Constructor): boolean {
return value instanceof constructor;
}
Expand Down