/**
 * 读取 package.json 或 package.json5
 */
export declare function readPackageJson(projectRoot: string): Promise<any | null>;
/**
 * 从 package.json 读取已安装的 features（基于 dependencies 和 devDependencies）
 * 返回已安装的包名列表
 */
export declare function getInstalledFeatures(projectRoot: string): Promise<string[]>;
/**
 * 检查指定的 feature 是否已安装
 */
export declare function isFeatureInstalled(projectRoot: string, featureId: string): Promise<boolean>;
/**
 * 合并 package.json
 */
export declare function mergePackageJson(projectRoot: string, newDependencies: Record<string, string>): Promise<void>;
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