isError

Check if the given value is an Error object.

This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to Error.

Signature

function isError(value: unknown): value is Error;

Parameters

• value(unknown): The value to test if it is an Error object.

Returns

(value is Error): True if the value is an Error object, otherwise false.

Examples

isError(new Error()); // true
isError('error'); // false
isError({ name: 'Error', message: '' }); // false