/** A value, or a reported reason there is none. E defaults to a plain message. */
export type Result<T = void, E = string> = {
    ok: true;
    value: T;
} | {
    ok: false;
    error: E;
};
/** Success. Call with no argument for a unit result (Result<void, E>). */
export declare function ok(): Result<void, never>;
export declare function ok<T>(value: T): Result<T, never>;
/** Failure carrying error. */
export declare function err<E>(error: E): Result<never, E>;
/** Narrow to the success arm. */
export declare function isOk<T, E>(result: Result<T, E>): result is {
    ok: true;
    value: T;
};
/** Narrow to the failure arm. */
export declare function isErr<T, E>(result: Result<T, E>): result is {
    ok: false;
    error: E;
};
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