export declare const base64: {
    fromBytes(src: Uint8Array, addPad?: boolean): string;
    toBytes(src: string, requirePad?: boolean): Uint8Array;
};
export declare const base64url: {
    fromBytes(src: Uint8Array, addPad?: boolean): string;
    toBytes(src: string, requirePad?: boolean): Uint8Array;
};
export declare const b64: {
    fromBytes(src: Uint8Array, addPad?: boolean): string;
    toBytes(src: string, requirePad?: boolean): Uint8Array;
};