ts-data-forge/dist/functional/result/impl/result-is-err.d.mts

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import { type NarrowToErr } from './types.mjs';
/**
 * Type guard for the error variant.
 *
 * @example
 *
 * ```ts
 * const operation = Result.ok(3);
 *
 * const failure = Result.err('error');
 *
 * if (Result.isOk(operation)) {
 *   const value: number = operation.value;
 *
 *   assert.isTrue(value === 3);
 * }
 *
 * assert.isTrue(Result.isErr(failure));
 * ```
 */
export declare const isErr: <R extends UnknownResult>(result: R) => result is NarrowToErr<R>;
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