export declare const isArray: (arg: any) => arg is any[];
export declare const isString: (val: unknown) => val is string;
export declare const isOn: (key: string) => boolean;
export declare const isObject: (val: unknown) => val is Record<any, any>;
export declare const EMPTY_OBJ: {
    readonly [key: string]: any;
};
export declare const EMPTY_ARR: any[];