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'use strict';
var objectToString = Object.prototype.toString;
var getPrototypeOf = Object.getPrototypeOf;
var ERROR_TYPE = '[object Error]';
module.exports = function isError(err) {
if (typeof err !== 'object') {
return false;
}
if (err instanceof Error) {
// Accept `AssertionError`s from the `assert` module that ships
// with Node.js v6.1.0, compare issue #4.
return true;
}
while (err) {
if (objectToString.call(err) === ERROR_TYPE) {
return true;
}
err = getPrototypeOf(err);
}
return false;
};
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