export interface ParsedDataUrl {
    mediaType: string;
    data: string;
    isBase64: boolean;
}
export interface ParsedBase64DataUrl {
    mediaType: string;
    data: string;
}
export declare function parseDataUrl(value: string): ParsedDataUrl | null;
export declare function parseBase64DataUrl(value: string): ParsedBase64DataUrl | null;
export declare function isBase64(data: string): boolean;
export declare function base64ByteLength(data: string): number;