/**
 * Run `handler` while holding an advisory lock file, so concurrent CLI processes (dev sessions,
 * e2e runs in other worktrees) never interleave a read-modify-write of shared state such as the
 * Caddy config. Locks from dead processes and locks older than `staleMs` are taken over, and after
 * `timeoutMs` the lock is stolen rather than failing the caller: a stuck lock file must never make
 * `stam dev` or an e2e run unusable.
 */
export declare function withFileLock<T>(lockPath: string, handler: () => Promise<T>, options?: {
    timeoutMs?: number;
    staleMs?: number;
}): Promise<T>;
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