export declare const _ch: {
    isDef: <T>(v: T) => v is NonNullable<T>;
    isPromise: (val: any) => val is Promise<any>;
    isTrue: (v: any) => boolean;
    isFalse: (v: any) => boolean;
    isArray: (arg: any) => arg is any[];
    isUnDef: (v: any) => v is undefined | null;
    isObject: (obj: any) => boolean;
    isFunction: (value: any) => value is (...args: any[]) => any;
    isDate: (val: unknown) => val is Date;
    isMap: (val: unknown) => val is Map<any, any>;
    isSet: (val: unknown) => val is Set<any>;
    isSymbol: (val: unknown) => val is symbol;
    isNull: (value: any) => boolean;
    isEmptyArray: (arr: unknown) => boolean;
    isEmptyObject: (obj: unknown) => boolean;
};