function isError
Usage in Deno
import { isError } from "node:util";
isError(object: unknown): object is Error
Deprecated
Since v4.0.0 - Use types.isNativeError instead.
Returns true if the given object is an Error. Otherwise, returns false.
import util from 'node:util';
util.isError(new Error());
// Returns: true
util.isError(new TypeError());
// Returns: true
util.isError({ name: 'Error', message: 'an error occurred' });
// Returns: false
This method relies on Object.prototype.toString() behavior. It is
possible to obtain an incorrect result when the object argument manipulates @@toStringTag.
import util from 'node:util';
const obj = { name: 'Error', message: 'an error occurred' };
util.isError(obj);
// Returns: false
obj[Symbol.toStringTag] = 'Error';
util.isError(obj);
// Returns: true
object is Error