isErr API Reference

Signature

tsSignature

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export function isErr<T, E>(result: Result<T, E>): result is Err<E>;

tsImport

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import { isErr } from "@/lib/flow/core/result";
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import { isErr } from "@/lib/flow";

T

Success value type.

E

Expected error value type.

result

Result to inspect.

`true` when the result is `Err`.

Return type

result is Err<E>

Failed `Result` variant.

type

Explicit success-or-failure outcome used throughout Flow.

type

tsflow/core/result.ts:130-132

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export function isErr<T, E>(result: Result<T, E>): result is Err<E> {
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  return !result.ok;
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}