/** Something outside this process will restart it when it exits. */
export declare function isSupervised(): boolean;
/** Start the successor. Caller exits right after. */
export declare function relaunchSelf(mode: "global" | "npx" | "dev" | "unknown"): void;
/** In the successor: block until the process that spawned us has exited.
 *  No-op when we were not spawned by relaunchSelf. Gives up after 20s rather
 *  than hang forever behind a predecessor that will not die. */
export declare function waitForPredecessor(): Promise<void>;