import type { ChildPluginReference, PackageReference } from './manifest.js';
/**
 * Package whose `zhin.features` define the Stable Feature composition
 * (adapter / command / component / middleware / handler).
 *
 * Root inherits these when it depends on `@zhin.js/core` directly, or on the
 * `zhin.js` facade (which depends on `@zhin.js/core`).
 */
export declare const PLATFORM_FEATURE_CARRIER = "@zhin.js/core";
/**
 * Install facade that may declare default child plugins and re-exports core
 * authoring surfaces.
 */
export declare const PLATFORM_FEATURE_FACADE = "zhin.js";
/**
 * Merge user-declared features with inherited platform features.
 * User references for the same package win (pin / override).
 */
export declare function mergeFeatureReferences(declared: readonly PackageReference[], inherited: readonly PackageReference[]): readonly PackageReference[];
/**
 * Merge user-declared child plugins with facade defaults.
 * User references for the same instanceKey win (pin / override).
 */
export declare function mergeChildPluginReferences(declared: readonly ChildPluginReference[], inherited: readonly ChildPluginReference[]): readonly ChildPluginReference[];
export declare function declaredPackageDependency(dependencies: Readonly<Record<string, string>> | undefined, optionalDependencies: Readonly<Record<string, string>> | undefined, name: string): string | undefined;