export interface ProcessIdentity {
    pid: number;
    /** Linux /proc stat start time; prevents a reused PID matching the snapshot. */
    startTime: string;
}
/** Snapshot one root and all descendants by real PPID ancestry, never argv. */
export declare function snapshotProcessTree(rootPid: number): ProcessIdentity[];
export declare function isProcessIdentityAlive(identity: ProcessIdentity): boolean;
export declare function waitForProcessTreeExit(identities: readonly ProcessIdentity[], timeoutMs?: number): Promise<boolean>;
/** Synchronous twin used by the synchronous manual-GC teardown path. */
export declare function waitForProcessTreeExitSync(identities: readonly ProcessIdentity[], timeoutMs?: number): boolean;
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