API ClientsTypeScript SDKAPI ReferenceCoreFunctionsisErr()Version: 8.9 (unreleased)On this pageFunction: isErr() function isErr<T, E>(r): r is { error: E; ok: false }; Defined in: resultClient.ts:6 Type Parameters T T E E Parameters r Result<T, E> Returns r is { error: E; ok: false }Was this helpful?