export declare function toBase64URL(data: string): string;
export declare function toBase64URL(data: Uint8Array): string;
export declare function fromBase64(data: string): string;
export declare function fromBase64ToUint8Array(data: string): Uint8Array;
export declare function isBase64URL(str: string): boolean;
export declare function fromBase64ToBlob(data: string): Blob;
export declare function blobToDataURL(blob: Blob): Promise<string>;
