function isError
Usage in Deno
```typescript import { isError } from "node:node__util.d.ts"; ```
isError(object: unknown): object is Error
Deprecated
Since v4.0.0 - Use [types.isNativeError](../.././node__util.d.ts/~/types.isNativeError) instead.
Returns `true` if the given `object` is an `Error`. Otherwise, returns `false`.
```js
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`.
```js
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