export declare const INSTALL_TERMINATION_FAILED = -1;
export declare function safeProcessGroup(pid: number | undefined): number | undefined;
export declare function installExitCode(code: number | null, timedOut: boolean): number;
export declare function startInstallHeartbeat(): NodeJS.Timeout;
export type ProcessGroupSupervisor = {
    isAlive: (processGroup: number) => boolean;
    signal: (processGroup: number, signal: NodeJS.Signals) => void;
    waitForExit: (processGroup: number, timeoutMs: number) => Promise<boolean>;
};
export declare function terminateProcessGroup(processGroup: number, supervisor?: ProcessGroupSupervisor): Promise<boolean>;
export declare function terminateSafeProcessGroup(pid: number | undefined): Promise<boolean>;