export declare const isFunction: (obj: any) => obj is Function;
export declare const isNaN: (num: string | number) => boolean;
export declare const isString: (obj: any) => obj is string;
export declare const isEmptyObject: (obj: any) => boolean;
export declare function safeJSONStringify<T = any>(value: any): T;
export declare function safeJSONParse<T = any>(str: string | null | undefined, dft: T): T;
export declare const upFirst: (word: string) => string;
export declare const isIOS: boolean;
export declare function notice(text: string): void;