type Left<T> = {
    error: T;
    result?: never;
};
type Right<U> = {
    error?: never;
    result: U;
};
export type Either<T, U> = NonNullable<Left<T> | Right<U>>;
export type ConversionMode = 'buffer' | 'atob-btoa';
export declare const base64urlToString: (base64url: string, mode?: ConversionMode) => string;
export declare const stringToBase64url: (value: string, mode?: ConversionMode) => string;
/**
 * Encodes JSON object to base64url
 * Compatible with both browser and node envs
 */
export declare const encodeCursor: (object: Record<string, unknown>) => string;
/**
 * Decodes base64url to JSON object
 * Compatible with both browser and node envs
 */
export declare const decodeCursor: (value: string) => Either<Error, Record<string, unknown>>;
export {};