export declare const getQueryStringValue: (key: string) => string | null;
export declare const getPathnameValue: any;
export declare const isJsonString: (str: string) => boolean;
export declare const base64ToText: (base64: any) => string;
export declare const textToBase64: (text: string) => string;
export declare const getFileSuffix: (v: string) => string;
export declare const toBase64: (file: Blob) => Promise<string>;