import { type PathEnvironment } from '../config/paths.js';
export type PidLiveness = (pid: number) => boolean | Promise<boolean>;
export interface InstanceLockOptions extends PathEnvironment {
    runtimeDirectory?: string;
    pid?: number;
    instanceId?: string;
    isPidAlive?: PidLiveness;
}
export interface InstanceLock {
    path: string;
    instanceId: string;
    release(): Promise<boolean>;
}
export declare function isPidAlive(pid: number): Promise<boolean>;
export declare function acquireInstanceLock(databasePath: string, options?: InstanceLockOptions): Promise<InstanceLock>;
export declare function releaseInstanceLock(lockFilePath: string, expectedInstanceId: string): Promise<boolean>;
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