export type ProcessIdentity = {
    pid: number;
    startIdentity: string;
};
/**
 * Tracks supervised process groups by PID and operating-system start identity.
 * A later server kills a recorded process only when both values still match.
 */
export declare class ServerProcessRegistry {
    private readonly filePath;
    private readonly processes;
    constructor(storeDir: string);
    register(pid: number): ProcessIdentity;
    unregister(pid: number): void;
    get size(): number;
    /** Kill one exact registered process group and remove its durable record. */
    kill(pid: number): boolean;
    /** Kill every process that still has its registered start identity. */
    killAll(): void;
    /** Reap only exact stale process identities recorded by an older server. */
    reapOrphans(): number[];
    private readFile;
    private persist;
}
/** Return the operating-system parent PID for a live process. */
export declare function processParentPid(pid: number): number | undefined;
/** Return an operating-system process start value that fences PID reuse. */
export declare function processStartIdentity(pid: number): string | undefined;
export declare function matchesProcessIdentity(identity: ProcessIdentity): boolean;