export declare const isObj: (val: any) => boolean;
export declare const isFunc: (val: any) => boolean;
export declare const isStr: (val: any) => boolean;
export declare const isArr: (val: any) => boolean;
export declare const isUndef: (val: any) => boolean;
export declare const keyExists: (val: object, key: string) => boolean;
export declare const objIsEmpty: (val: object) => boolean;