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

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import { type UnwrapErr, type UnwrapOk, type UnwrapWarn } from './types.mjs';
/**
 * Applies a function returning a `TernaryResult` to the Ok variant.
 *
 * @example
 *
 * ```ts
 * const parse = (value: string): TernaryResult<number, string, string> =>
 *   Number.isNaN(Number(value))
 *     ? TernaryResult.err('NaN')
 *     : TernaryResult.ok(Number(value));
 *
 * const doubled = TernaryResult.flatMap(TernaryResult.ok('3'), (text) =>
 *   TernaryResult.map(parse(text), (num) => num * 2),
 * );
 *
 * const warnPassthrough = TernaryResult.flatMap(
 *   TernaryResult.warn('3', 'retry'),
 *   parse,
 * );
 *
 * const errPassthrough = TernaryResult.flatMap(TernaryResult.err('oops'), parse);
 *
 * assert.deepStrictEqual(doubled, TernaryResult.ok(6));
 *
 * assert.deepStrictEqual(warnPassthrough, TernaryResult.warn(3, 'retry'));
 *
 * assert.deepStrictEqual(errPassthrough, TernaryResult.err('oops'));
 * ```
 */
export declare function flatMap<R extends UnknownTernaryResult, S2, W2, E2>(result: R, flatMapFn: (value: UnwrapOk<R>) => TernaryResult<S2, E2, W2>): TernaryResult<S2, E2 | UnwrapErr<R>, W2 | UnwrapWarn<R>>;
export declare function flatMap<S, S2, W2, E2>(flatMapFn: (value: S) => TernaryResult<S2, E2, W2>): <W, E>(result: TernaryResult<S, E, W>) => TernaryResult<S2, E | E2, W | W2>;
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