import { OnDestroy, ViewRef } from '@angular/core';
import * as i0 from "@angular/core";
/**
 * A service that caches templates and placeholders to optimize view rendering.
 * It makes sure that all cached resources are cleared when the service is destroyed.
 *
 * @developerPreview
 */
export declare class VirtualViewCache implements OnDestroy {
    #private;
    /**
     * Stores a placeholder view in the cache. When the cache reaches its limit,
     * the oldest entry is removed.
     *
     * @param key - The key used to identify the placeholder in the cache.
     * @param view - The ViewRef of the placeholder to cache.
     */
    storePlaceholder(key: unknown, view: ViewRef): void;
    /**
     * Retrieves a cached placeholder view using the specified key.
     *
     * @param key - The key of the placeholder to retrieve.
     * @returns The ViewRef of the cached placeholder, or undefined if not found.
     */
    getPlaceholder(key: unknown): ViewRef;
    /**
     * Stores a content view in the cache. When the cache reaches its limit,
     * the oldest entry is removed.
     *
     * @param key - The key used to identify the content in the cache.
     * @param view - The ViewRef of the content to cache.
     */
    storeContent(key: unknown, view: ViewRef): void;
    /**
     * Retrieves a cached content view using the specified key.
     *
     * @param key - The key of the content to retrieve.
     * @returns The ViewRef of the cached content, or undefined if not found.
     */
    getContent(key: unknown): ViewRef;
    /**
     * Clears both content and placeholder caches for a given key.
     *
     * @param key - The key of the content and placeholder to remove.
     */
    clear(key: unknown): void;
    /**
     * Clears all cached resources when the service is destroyed.
     */
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<VirtualViewCache, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<VirtualViewCache>;
}