import type { RStringValue } from '../../../../r-bridge/lang-4.x/convert-values';
import type { Lift, Value, ValueString } from '../r-value';
export declare function stringFrom(str: RStringValue | string): ValueString;
export declare function liftString(str: Lift<RStringValue>): ValueString;
export declare function collectStrings(a: Value[]): string[] | undefined;
export declare const ValueEmptyString: ValueString<Lift<RStringValue>>;
export declare const ValueStringTop: ValueString<Lift<RStringValue>>;
export declare const ValueStringBot: ValueString<Lift<RStringValue>>;