/**
 * ObjectQL
 * Copyright (c) 2026-present ObjectStack Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
/**
 * Optimized Metadata Registry with O(k) package uninstall complexity
 *
 * Uses secondary indexes to achieve O(k) complexity for unregisterPackage
 * operation (where k is the number of items in the package) instead of
 * O(n*m) (where n is types and m is items per type).
 */
export declare class MetadataRegistry {
    private items;
    private packageIndex;
    constructor();
    register(type: string, nameOrConfig: string | Record<string, unknown>, config?: Record<string, unknown>): void;
    get<T = unknown>(type: string, name: string): T;
    list<T = unknown>(type: string): T[];
    getTypes(): string[];
    getEntry<T = unknown>(type: string, name: string): T;
    unregister(type: string, name: string): void;
    /**
     * Optimized package unregistration with O(k) complexity
     * where k is the number of items in the package.
     *
     * Previous complexity: O(n*m) - iterate all types and all items
     * New complexity: O(k) - direct lookup via secondary index
     */
    unregisterPackage(packageName: string): void;
}
export type MetadataItem = Record<string, unknown>;
/**
 * Legacy Metadata interface - kept for backward compatibility
 * @deprecated Use MetadataItem from @objectstack/runtime instead
 */
export interface Metadata {
    type: string;
    id: string;
    path?: string;
    package?: string;
    content: unknown;
}