Function isErr

isErr<T, E>(result: Result<T, E>): result is Err<T, E>
Type-narrowing predicate: returns true when the result is Err.
Type Parameters
- T
- E
Parameters
- result: Result<T, E>
Returns result is Err<T, E>
Example
```
if (isErr(r)) {
  metrics.inc("error", { kind: r.error.kind });
}
```
- Defined in packages/result/src/result.ts:55