export interface InstanceMarker {
    path: string;
    version: string | null;
    pid: number;
    ts: number;
}
/** Returns the conflicting instance's marker when a dual load is detected. */
export declare function detectDualInstance(selfPath: string, now?: number): InstanceMarker | undefined;
export declare function stampInstance(selfPath: string, version: string | null, pid?: number, now?: number): void;
/** Stamp ourselves; report a conflicting live marker if one exists. Stamp
 *  order matters: the OTHER instance's stamp may be from this same process
 *  (both loaded), so we overwrite only after reading the conflict. */
export declare function stampAndDetect(selfPath: string, version: string | null, now?: number): InstanceMarker | undefined;