export interface BuildLockHolder {
    pid: number;
    /** When the holder took the lock (epoch ms). */
    startedAt: number;
    lockPath: string;
}
export type BuildLock = {
    acquired: true;
    release: () => void;
} | {
    acquired: false;
    holder: BuildLockHolder | null;
};
export declare const buildLockPath: (dbPath: string) => string;
/** The process holding the build lock for `dbPath`, or null when no live build holds it. */
export declare function liveBuildLockHolder(dbPath: string): BuildLockHolder | null;
/** "(pid 123, running 2m)" — who holds a build lock, for log lines. */
export declare function describeBuildLockHolder(holder: BuildLockHolder): string;
export declare function acquireBuildLock(dbPath: string): BuildLock;
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