This site describes solve-engine as it is on main: 2.43.0, which npm does not have yet. npm installs 2.40.0, so a page may show an answer that version does not give yet.
isErr
function isErr<T, E>(r): r is { error: E; ok: false };Defined in: packages/engine/src/errors/Result.ts:51
Narrow a Result to its failure arm.
Type Parameters
Section titled “Type Parameters”| Type Parameter |
|---|
T |
E |
Parameters
Section titled “Parameters”| Parameter | Type | Description |
|---|---|---|
r | Result<T, E> | The result to test. |
Returns
Section titled “Returns”r is { error: E; ok: false }
True when it failed, narrowing r so r.error is reachable.