import type { ValidationTriggerSelector } from './ValidationTriggerSelector';
import type { INotifyCollectionChanged } from '../../collections';
import { ValidationTrigger } from './ValidationTrigger';
/**
 * Represents the collection item validation trigger configuration.
 * @template TItem The type of items the collection contains.
 */
export interface ICollectionItemValidationTriggerConfig<TItem> {
    /**
     * Gets the collection containing the items that may trigger validation.
     */
    readonly collection: INotifyCollectionChanged<TItem> & Iterable<TItem>;
    /**
     * Gets the selector that provides the individual validation triggers for each item.
     */
    readonly validationTriggerSelector: ValidationTriggerSelector<TItem>;
    /**
     * Optional, a guard method which controls when a validation should be triggered.
     * @param item The item that changed which may trigger a validation.
     */
    shouldTriggerValidation?(item: TItem): boolean;
}
/**
 * Represents a collection item validation trigger. Instead of triggering a validation only when the collection changes,
 * a validation may be triggered by any of the contained items when they themselves change.
 *
 * This is useful when within the collection there is a field that needs to be unique,
 * such as a unique name for each item in the collection.
 *
 * @template TItem The type of items the collection contains.
 */
export declare class CollectionItemValidationTrigger<TItem> extends ValidationTrigger<INotifyCollectionChanged<TItem> & Iterable<TItem>> {
    private readonly _validationTriggerSelector;
    private readonly _shouldTriggerValidation;
    private readonly _itemValidationTriggersByItem;
    private readonly _collectionChangedEventHandler;
    private static _defaultShouldTriggerValidation;
    /**
     * Initializes a new instance of the {@linkcode CollectionItemValidationTrigger} class.
     * @param config The validation trigger config.
     */
    constructor(config: ICollectionItemValidationTriggerConfig<TItem>);
    /**
     * Subscribes to collection and item changes.
     */
    protected subscribeToTarget(): void;
    /**
     * Unsubscribes from collection and item changes.
     */
    protected unsubscribeFromTarget(): void;
    private _ensureItemValidationTriggers;
}