/**
 * Pid file management for the simulator.
 *
 * One sim process at a time per project. Long-lived commands (`mikro sim dev`,
 * `mikro sim repl`) claim the pid file and kill any predecessor. Short-lived
 * commands (`mikro sim deploy`, `mikro sim test`, etc.) check the pid file
 * and refuse to run if a sim is already alive — they would race on sim-fs
 * writes or yank files out from under the running process.
 */
export declare function isAlive(pid: number): boolean;
export declare function readPid(mikroDir: string): number | null;
export declare function clearPid(mikroDir: string): void;
export declare class SimAlreadyRunningError extends Error {
    pid: number;
    constructor(pid: number);
}
/**
 * Refuse to proceed if a sim is already running. Used by short-lived commands
 * (deploy, test, env, profile, clean, reset).
 */
export declare function checkPid(mikroDir: string): void;
/**
 * Claim the pid file for this process. If a predecessor is alive, kill it
 * first (SIGTERM, then SIGKILL after a short grace period). Registers exit
 * cleanup to remove the file on normal termination.
 *
 * Used by long-lived commands (dev, repl).
 */
export declare function claimPid(mikroDir: string): Promise<void>;
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