import { CacheHelper } from './CacheHelper.js';
export declare const INJECT_COMPONENT_CACHE_CONTEXT: unique symbol;
export declare class ComponentCacheHelper extends CacheHelper {
    payloadKeys: string[];
    /**
     * Add payload keys for which the value should be extracted and stored
     * in cache.
     */
    addPayloadKeys(keys: string | string[]): this;
}