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node_modules/graphql/jsutils/defineToJSON.js.flow

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+// @flow strict
+
+import nodejsCustomInspectSymbol from './nodejsCustomInspectSymbol';
+
+/**
+ * The `defineToJSON()` function defines toJSON() and inspect() prototype
+ * methods, if no function provided they become aliases for toString().
+ */
+export default function defineToJSON(
+  classObject: Class<any> | ((...args: Array<any>) => mixed),
+  fn?: () => mixed = classObject.prototype.toString,
+): void {
+  classObject.prototype.toJSON = fn;
+  classObject.prototype.inspect = fn;
+  if (nodejsCustomInspectSymbol) {
+    classObject.prototype[nodejsCustomInspectSymbol] = fn;
+  }
+}