export declare const isDef: <T>(val: T | null | undefined) => val is T;
export declare const isFunc: (val: any) => val is CallableFunction;
export declare const isNum: (val: any) => val is number;
export declare const isStr: (val: any) => val is string;
export declare const isArray: (val: any) => val is any[];
export declare const isElement: (val: any) => val is Element;
export declare const isObj: (val: any) => val is Record<any, any>;