/**
 * Tiny semaphore for bounded parallelism — avoids a p-limit dependency.
 * Limits concurrent async tasks to `concurrency` at a time.
 */
declare function makeSemaphore(concurrency: number): () => Promise<() => void>;
/**
 * Default concurrency for git-history tasks: CPU count clamped to [2, 8].
 * Each getDocHistoryAsync call issues one git process, so this saturates git
 * without spawning excessively on many-core machines. Load-bearing for the CLI
 * / postBuild per-file fan-out; the preBuild meta pass no longer uses it — it
 * walks history once via getAllFilesFirstLastMetaAsync (#2517).
 */
declare function defaultGitConcurrency(): number;

export { defaultGitConcurrency, makeSemaphore };