interface RuntimePackage {
    resolve: NodeJS.RequireResolve;
    manifest: string;
}
export declare class RuntimeInstallError extends Error {
}
/** Reuse an exact installed payload when available, otherwise install only on
 * demand. Pi may already ship the JS engine; its dependency is not our guarantee. */
export declare function runtimePackage(name: string, version: string, agentDir: string, mode: string, signal?: AbortSignal): Promise<RuntimePackage>;
export {};