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