/**
 * A collection of graph categories in a schema.
 */
export declare class GraphCategoryCollection extends BaseCollection<GraphCategory> {
    private constructor();
    /**
     * Gets the schema that owns the collection.
     */
    get schema(): GraphSchema;
    /**
     * Gets the number of categories in the collection.
     */
    get size(): number;
    /**
     * Creates a subscription for a set of named events.
     */
    subscribe(events: GraphCategoryCollectionEvents): EventSubscription;
    /**
     * Determines whether the collection contains the specified category.
     */
    has(category: GraphCategory | GraphCategoryIdLike): boolean;
    /**
     * Gets the category with the provided id.
     */
    get(id: GraphCategoryIdLike): GraphCategory | undefined;
    /**
     * Gets the category with the provided id. If one does not exist, a new category is created.
     */
    getOrCreate(id: GraphCategoryIdLike, metadataFactory?: () => GraphMetadata): GraphCategory;
    /**
     * Adds a category to the collection.
     */
    add(category: GraphCategory): this;
    /**
     * Removes a category from the collection.
     */
    delete(category: GraphCategory): boolean;
    /**
     * Removes a category from the collection.
     */
    delete(category: GraphCategoryIdLike): GraphCategory | false;
    /**
     * Removes a category from the collection.
     */
    delete(category: GraphCategory | GraphCategoryIdLike): GraphCategory | boolean;
    /**
     * Removes all categories from the collection.
     */
    clear(): void;
    /**
     * Creates an iterator for the values in the collection.
     */
    values(categoryIds?: Iterable<GraphCategoryIdLike>): IterableIterator<GraphCategory>;
    /**
     * Creates an iterator for the categories in the collection based on the provided base category.
     */
    basedOn(base: GraphCategory | GraphCategoryIdLike): IterableIterator<GraphCategory>;
    /**
     * Creates an iterator for the values in the collection.
     */
    [Symbol.iterator](): IterableIterator<GraphCategory>;
}

export interface GraphCategoryCollectionEvents {
    /**
     * An event raised when a category is added to the collection.
     */
    onAdded?: (category: GraphCategory) => void;
    /**
     * An event raised when a category is removed from the collection.
     */
    onDeleted?: (category: GraphCategory) => void;
}