export declare function isNumber(value: any): value is number;
export declare function isString(value: any): value is string;
export declare function isUndefined(value: any): boolean;
export declare function isNullOrUndefined(value: any): boolean;
export declare function last<T>(array: T[]): T;
export declare type Comparator<T> = (x: T, y: T) => number;
export declare function max<T>(array: T[], comparator: Comparator<T>): T;