/**
 * Structure of Unity's Packages/manifest.json
 */
interface PackageManifest {
    dependencies: Record<string, string>;
    [key: string]: unknown;
}
/**
 * Load and validate a Unity package manifest.
 * @returns The parsed manifest or an error string.
 */
export declare function load_manifest(project_path: string): {
    manifest: PackageManifest;
    path: string;
} | {
    error: string;
};
/**
 * Save a manifest to disk preserving original key order, with 2-space indent.
 */
export declare function save_manifest(manifest_path: string, manifest: PackageManifest): void;
/**
 * List packages from the manifest, optionally filtering by search pattern.
 */
export declare function list_packages(project_path: string, search?: string): {
    packages: {
        name: string;
        version: string;
    }[];
    count: number;
} | {
    error: string;
};
/**
 * Add or update a package in the manifest.
 */
export declare function add_package(project_path: string, name: string, version: string): {
    success: true;
    action: 'added' | 'updated';
    name: string;
    version: string;
} | {
    error: string;
};
/**
 * Remove a package from the manifest.
 */
export declare function remove_package(project_path: string, name: string): {
    success: true;
    name: string;
} | {
    error: string;
};
export {};
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