Function: isError()
ts
function isError(value: unknown): value is Error;Returns true if value is an Error instance or satisfies the Error duck-type shape.
Parameters
| Parameter | Type | Description |
|---|---|---|
value | unknown | The value to test. |
Returns
value is Error
true when value conforms to the Error shape.
Remarks
Returns false for undefined and null — the Error contract requires an actual instance.