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+// @flow strict
+import invariant from './invariant';
+import nodejsCustomInspectSymbol from './nodejsCustomInspectSymbol';
+
+/**
+ * The `defineInspect()` function defines `inspect()` prototype method as alias of `toJSON`
+ */
+export default function defineInspect(
+ classObject: Class<any> | ((...args: Array<any>) => mixed),
+): void {
+ const fn = classObject.prototype.toJSON;
+ invariant(typeof fn === 'function');
+
+ classObject.prototype.inspect = fn;
+
+ // istanbul ignore else (See: 'https://github.com/graphql/graphql-js/issues/2317')
+ if (nodejsCustomInspectSymbol) {
+ classObject.prototype[nodejsCustomInspectSymbol] = fn;
+ }
+}