charlike/templates/node_modules/es5-ext/error/is-error.js

Small, fast, simple and streaming project scaffolder for myself, but not only. Supports hundreds of template engines through the @JSTransformers API or if you want custom `render` function passed through options

'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;
};