src/lib/utils/PropTypeError.js

/**
 * We use an Error-like object for backward compatibility as people may call
 * PropTypes directly and inspect their output. However we don't use real
 * Errors anymore. We don't inspect their stack anyway, and creating them
 * is prohibitively expensive if they are created too often, such as what
 * happens in oneOfType() for any type before the one that matched.
 */
function PropTypeError(message) {
  this.message = message;
  this.stack = '';
}
// Make `instanceof Error` still work for returned errors.
PropTypeError.prototype = Error.prototype;

module.exports = PropTypeError;