import { Observable } from 'rxjs';
import { scrollPosition } from "./models/scrollPosition";
/**
 * Returns all the entities are distinct by the
 * `property` value argument.
 *
 * Note that the implementation uses a `Map<string, E>` to
 * index the entities by key.  Therefore the more recent occurences
 * matching a key instance will overwrite the previous ones.
 *
 * @param property The name of the property to check for distinct values by.
 * @param entities The entities in the array.
 *
 * @example
 ```
  let todos: Todo[] = [
    { id: 1, title: "Lets do it!" },
    { id: 1, title: "Lets do it again!" },
    { id: 2, title: "All done!" }
  ];

  let todos2: Todo[] = [
    { id: 1, title: "Lets do it!" },
    { id: 2, title: "All done!" }
  ];

  expect(distinct(todos, "id").length).toEqual(2);
  expect(distinct(todos2, "id").length).toEqual(2);

 ```
 */
export declare function distinct<E, K extends keyof E>(entities: E[], property: K): E[];
/**
 * Returns true if all the entities are distinct by the
 * `property` value argument.
 *
 * @param property The name of the property to check for distinct values by.
 * @param entities The entities in the array.
 *
 * @example
 *
 ```
  let todos: Todo[] = [
    { id: 1, title: "Lets do it!" },
    { id: 1, title: "Lets do it again!" },
    { id: 2, title: "All done!" }
  ];

  let todos2: Todo[] = [
    { id: 1, title: "Lets do it!" },
    { id: 2, title: "All done!" }
  ];

  expect(unique(todos, "id")).toBeFalsy();
  expect(unique(todos2, "id")).toBeTruthy();
 ```
 */
export declare function unique<E>(entities: E[], property: keyof E): boolean;
/**
 * Create a global ID
 * @return The global id.
 *
 * @example
 * let e.guid = GUID();
 */
export declare function GUID(): string;
/**
 * Set the global identfication property on the instance.
 *
 * @param e Entity we want to set the global identifier on.
 * @param gid The name of the `gid` property.  If not specified it defaults to `ESTORE_CONFIG_DEFAULT.guidKey`.
 */
export declare function attachGUID<E>(e: E, gid?: string): string;
/**
 * Set the global identfication property on the instance.
 *
 * @param e[] Entity array we want to set the global identifiers on.
 * @param gid The name of the `gid` property.  If not specified it defaults to `gid`.
 */
export declare function attachGUIDs<E>(e: E[], gid?: string): void;
/**
 * Create a shallow copy of the argument.
 * @param o The object to copy
 */
export declare function shallowCopy<E>(o: E): E;
/**
 * Create a deep copy of the argument.
 * @param o The object to copy
 */
export declare function deepCopy<E>(o: E): any;
/**
 * Gets the current active value from the `active`
 * Map.
 *
 * This is used for the scenario where we are managing
 * a single active instance.  For example
 * when selecting a book from a collection of books.
 *
 * The selected `Book` instance becomes the active value.
 *
 * @example
 * const book:Book = getActiveValue(bookStore.active);
 * @param m
 */
export declare function getActiveValue<E>(m: Map<any, E>): any;
/**
 * The method can be used to exclude keys from an instance
 * of type `E`.
 *
 * We can use this to exclude values when searching an object.
 *
 * @param entity An instance of type E
 * @param exclude The keys to exclude
 *
 * @example
 * todo = { id: '1', description: 'Do it!' }
 * let keys = excludeKeys<Todo>(todo, ['id]);
 * // keys = ['description']
 */
export declare function excludeKeys<E>(entity: any, exclude: string[]): string[];
/**
 *
 * @param entities The entity to search
 * @param exclude Keys to exclude from each entity
 *
 * @return E[] Array of entities with properties containing the search term.
 */
export declare function search<E>(query: string | undefined, entities: E[], exclude?: string[]): E[];
/**
 * @param scrollable The element being scrolled
 * @param debounceMS The number of milliseconds to debounce scroll events
 * @param sp The function returning the scroll position coordinates.
 * @return A boolean valued observable indicating whether the element is scrolling up or down
 */
export declare function scrollingUp(scrollable: any, debounceMS: number, sp: scrollPosition): Observable<boolean>;
/**
 * Filters the entities properties to the set contained in the
 * `keys` array.
 *
 * @param keys The array of keys that the entity be limited to
 * @param entity The entity to map
 * @return An entity instance that has only the keys provided in the keys array
 */
export declare function mapEntity(keys: string[], entity: any): any;
/**
 * Returns an `Observable<E>` instance that
 * filters for arguments where the property
 * value matches the provided value.
 *
 * @param value The value targeted
 * @param propertyName The name of the property to contain the value
 * @param obs The Slice Object Store Observable
 * @returns Observable<E>
 */
export declare function onFilteredEvent<E>(value: any, propertyName: string, obs: Observable<E>): Observable<E>;