export interface PidEntry {
    pid?: number;
    task: string;
    spawnedAt: string;
}
export declare class PidSidecar {
    private readonly projectRoot;
    private readonly sessionId;
    constructor(projectRoot: string, sessionId: string);
    private path;
    /**
     * Read all pid entries for this session from disk.
     * Returns an empty map if the file is missing or malformed — never throws.
     */
    readAll(): Promise<Record<string, PidEntry>>;
    /**
     * Record a runId->PidEntry mapping persistently.
     * Reads existing entries, merges, and atomically rewrites the sidecar file.
     */
    record(runId: string, entry: PidEntry): Promise<void>;
}
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