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

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import { type UnwrapErr, type UnwrapOk, type UnwrapWarn } from './types.mjs';
/**
 * Maps the Err variant while leaving Ok/Warn untouched.
 *
 * @example
 *
 * ```ts
 * const errValue = TernaryResult.err('boom');
 *
 * const mappedErr = TernaryResult.mapErr(errValue, (error) =>
 *   error.toUpperCase(),
 * );
 *
 * const warnPassthrough = TernaryResult.mapErr(
 *   TernaryResult.warn(2, 'slow'),
 *   (error: string) => `${error}!`,
 * );
 *
 * assert.deepStrictEqual(mappedErr, TernaryResult.err('BOOM'));
 *
 * assert.deepStrictEqual(warnPassthrough, TernaryResult.warn(2, 'slow'));
 * ```
 */
export declare function mapErr<R extends UnknownTernaryResult, E2>(result: R, mapFn: (error: UnwrapErr<R>) => E2): TernaryResult<UnwrapOk<R>, E2, UnwrapWarn<R>>;
export declare function mapErr<E, E2>(mapFn: (error: E) => E2): <S, W>(result: TernaryResult<S, E, W>) => TernaryResult<S, E2, W>;
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