node_modules/npm/node_modules/node-gyp/node_modules/path-array/node_modules/array-index/node_modules/es6-symbol/node_modules/es5-ext/error/is-error.js

'use strict';

var toString = Object.prototype.toString

  , id = toString.call(new Error());

module.exports = function (x) {
	return (x && ((x instanceof Error) || (toString.call(x)) === id)) || false;
};