isError

Checks if a value is an Error instance.

Available since v2.0.0

Import

import { isError } from '@helpers4/guard';
// or, from the all-in-one package (same code, one install):
import { isError } from 'helpers4/guard';

isError(value: unknown): value is Error

Parameter	Type	Description
`value`	`unknown`	The value to check

value is Error — True if value is an Error (or subclass like TypeError, RangeError, etc.)

isError(new Error('oops'))     // => true
isError(new TypeError('bad'))  // => true
isError({ message: 'fake' })  // => false