import BN from 'bn.js';
export declare function bnToBase64Url(bn: BN): string;
export declare function bytesToBase64(b: Uint8Array): string;
export declare function bigintToBytes(n: bigint): Uint8Array;
export declare function strToBase64(str: string): string;
export declare function base64ToStr(str: string): string;
export declare function strToBase64Url(str: string): string;
export declare function objToBase64Url(obj: object): string;
export declare function base64UrlToStr(str: string): string;
export declare function base64UrlToObj(str: string): object | any;
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