export type PortableUpdateSwap = {
    parentPid: number;
    installRoot: string;
    stagedRoot: string;
    backupRoot: string;
    helperRoot: string;
    nodeRelativePath: string;
};
export declare function waitForProcessExit(pid: number, timeoutMs?: number): Promise<void>;
export declare function swapPortableInstall(swap: PortableUpdateSwap): Promise<void>;
export declare function runPortableUpdateHelper(configPath: string): Promise<void>;