import { StateCache } from './index.js';
import { State } from '../state/index.js';
/**
 * The NeverCache caches absolutely nothing.
 *
 * This should usually only be used in testing scenarios or if you really
 * know what you're doing.
 *
 * Using it could cause excessive requests, and will cause embedded items
 * to be ignored.
 */
export declare class NeverCache implements StateCache {
    /**
     * Store a State object.
     *
     * This function will clone the state object before storing
     */
    store(state: State): void;
    /**
     * Retrieve a State object from the cache by its absolute uri
     */
    get(uri: string): null;
    /**
     * Return true if a State object with the specified uri exists in the cache
     */
    has(uri: string): boolean;
    /**
     * Delete a State object from the cache, by its uri
     */
    delete(uri: string): void;
    /**
     * Purge the entire cache
     */
    clear(): void;
}