declare module "utils/types" {
    /**
     * A function that checks if something is a valid string.
     * @param value The value which will be checked.
     * Returns true if value is a string.
     */
    export function isString(value: any): boolean;

    /**
     * A function that checks if something is a valid number.
     * @param value The value which will be checked.
     * Returns true if value is a number.
     */
    export function isNumber(value: any): boolean;

    /**
     * A function that checks if something is a function.
     * @param value The value which will be checked.
     * Returns true if value is a function.
     */
    export function isFunction(value: any): boolean;

    /**
     * A function that checks if something is an object.
     * @param value The value which will be checked.
     * Returns true if value is an object.
     */
    export function isObject(value: any): boolean;
    
    /**
     * A function that checks if something is "undefined".
     * @param value The value which will be checked.
     * Returns true if value is "undefined".
     */
    export function isUndefined(value: any): boolean;

    /**
     * A function that checks if something is defined (not undefined).
     * @param value The value which will be checked.
     * Returns true if value is defined.
     */
    export function isDefined(value: any): boolean;

    /**
     * A function that checks if something is not defined (null or undefined).
     * @param value The value which will be checked.
     * Returns true if value is null or undefined.
     */
    export function isNullOrUndefined(value: any): boolean;

    /**
     * A function that checks if something is a valid function.
     * @param value The value which will be checked.
     * Throws exception if passed value is not a valid function.
     */
    export function verifyCallback(value: any): void;

    /**
     * A function that gets the class name of an object.
     * @param object The object which class will be get.
     * Returns a string with the name of the class.
     */
    export function getClass(object): string;

    /**
     * A function that gets the entire class hierarchy of an object.
     * @param object The object which class hierarchy will be get.
     * Return an array of strings with the name of all classes.
     */
    export function getBaseClasses(object): Array<string>;

    /**
     * A function that gets the ClassInfo for an object.
     * @param object The object for which the ClassInfo will be get.
     * Returns a ClassInfo for the object.
     */
    export function getClassInfo(object: Object): ClassInfo;

    /**
     * A Class holding information about a class
     */
    export class ClassInfo {
        /**
         * Gets the name of the class.
         */
        name: string;

        /**
         * Gets the ClassInfo for the base class of the current info.
         */
        baseClassInfo: ClassInfo;
    }

    /**
     * Returns a string representation of a string to be shown in UI.
     * @param object The object which class hierarchy will be get.
     */
    export function toUIString(object): string;
}