/**
 * Docker update and restart handler
 *
 * Called when a container exits with DOCKER_UPDATE_EXIT_CODE.
 * Installs the new version on the host and re-execs the process.
 */
/**
 * Called on the host after a container exits with DOCKER_UPDATE_EXIT_CODE.
 * Reads the new version from a project-specific config dir (written by the container),
 * installs it on the host with npm, then re-execs the process so ensureImage()
 * picks up the newly installed version and rebuilds the Docker image.
 */
export declare function installUpdateAndRestart(projectConfigDir?: string): Promise<void>;
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