export declare type SuccessParameterReducerResult<T, S> = {
    valid: true;
    rest: string[];
    parsed: Omit<S, keyof T> & {
        [key in keyof T]?: T[key] | (key extends keyof S ? S[key] : never);
    };
};
export declare type ParameterReducerResult<T, S> = undefined | SuccessParameterReducerResult<T, S> | {
    valid: false;
    reason: string;
};
export declare type ParameterReducer<TParsed> = <TAlreadyParsed>(input: string[], parsed: TAlreadyParsed) => ParameterReducerResult<TParsed, TAlreadyParsed>;
export declare type ParsedString<TParsed> = {
    readonly valid: true;
    readonly value: TParsed;
} | {
    readonly valid: false;
    readonly reason: string;
};