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node_modules.graphql.jsutils.isInvalid.js.flow Maven / Gradle / Ivy

/* @flow */
/**
 *  Copyright (c) 2015, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 */

/**
 * Returns true if a value is undefined, or NaN.
 */
export default function isInvalid(value: mixed): boolean {
  return value === undefined || value !== value;
}