export declare function isObject(value: unknown): value is Record<string, any>;
export declare const isUndefined: (val: unknown) => val is undefined;
export declare const isFunction: (val: unknown) => val is Function;
export declare const isString: (val: unknown) => val is string;
export declare const isBoolean: (val: unknown) => val is boolean;
export declare const isArray: (arg: any) => arg is any[];