type Error<T> = {
    error: T;
    value?: never;
};
type Success<U> = {
    error?: never;
    value: U;
};
export type Result<T, U> = NonNullable<Error<T> | Success<U>>;
export type UnwrapResult = <T, U>(e: Result<T, U>) => NonNullable<T | U>;
export declare const unwrapResult: UnwrapResult;
export declare const isError: <T, U>(e: Result<T, U>) => e is Error<T>;
export declare const isSuccess: <T, U>(e: Result<T, U>) => e is Success<U>;
export declare const makeError: <T>(value: T) => Error<T>;
export declare const makeSuccess: <U>(value: U) => Success<U>;
export {};
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