import { type Result } from "../Error/safeExecute";
/**
 * Transforms the value inside a successful Result using the provided
 * mapping function. If the Result is an error, it is returned unchanged.
 *
 * @param result - The Result to transform.
 * @param function_ - The function to apply to the success value.
 * @returns A new Result with the transformed value, or the original error.
 *
 * @example
 * ```typescript
 * const success = { type: "success", value: 5 } as const;
 * mapResult(success, (n) => n * 2);
 * // { type: "success", value: 10 }
 *
 * const error = { type: "error", error: new Error("fail") } as const;
 * mapResult(error, (n) => n * 2);
 * // { type: "error", error: Error("fail") }
 * ```
 */
export declare const mapResult: <V, E, U>(result: Result<V, E>, function_: (value: V) => U) => Result<U, E>;