import type { ValidationTriggerSelector } from './ValidationTriggerSelector';
import type { INotifyCollectionChanged, INotifyCollectionReordered, INotifySetChanged, INotifyMapChanged } from '../../collections';
import type { INotifyPropertiesChanged } from '../../viewModels';
import { type IEvent } from '../../events';
/**
 * Represent a set of well-known validation triggers. These are used to simplify
 * object validator configurations as a view model or observable collection can
 * be directly passed as a trigger.
 *
 * @template TKey The type of keys the map contains.
 * @template TItem The type of items the collection, set, or map contains.
 *
 * @see {@link Form.validation}
 * @see {@link IObjectValidator}
 * @see {@link ValidationTrigger}
 */
export type WellKnownValidationTrigger<TKey = unknown, TItem = unknown> = INotifyPropertiesChanged | INotifyCollectionChanged<unknown> | INotifyCollectionReordered<unknown> | INotifySetChanged<unknown> | INotifyMapChanged<unknown, unknown> | [
    INotifyMapChanged<TKey, TItem> & Iterable<[TKey, TItem]>,
    ValidationTriggerSelector<TItem>
] | [
    (INotifyCollectionChanged<TItem> | INotifySetChanged<TItem>) & Iterable<TItem>,
    ValidationTriggerSelector<TItem>
];
/**
 * Represents a validation trigger. Generally, they wrap an observable object and whenever
 * it changes the {@linkcode validationTriggered} event is raised.
 *
 * @template TTrigger The concrete type that may trigger validations.
 */
export declare abstract class ValidationTrigger<TTrigger = unknown> {
    private readonly _validationTriggeredEventDispatcher;
    /**
     * Initializes a new instance of the {@linkcode ValidationTrigger} class.
     * @param trigger The source object that triggers validation.
     */
    protected constructor(trigger: TTrigger);
    /**
     * Gets the source object that triggers validation.
     */
    readonly trigger: TTrigger;
    /**
     * Gets an event that is raised whenever the source object triggers a validation.
     */
    readonly validationTriggered: IEvent<this>;
    /**
     * A plug-in method that handles the actual event subscription to the {@linkcode trigger}.
     */
    protected abstract subscribeToTarget(): void;
    /**
     * A plug-in method that handles the actual event unsubscription to the {@linkcode trigger}.
     */
    protected abstract unsubscribeFromTarget(): void;
    /**
     * Raises the {@linkcode validationTriggered} event, notifying that a validation should occur.
     */
    protected notifyValidationTriggered(): void;
}