/**
 * Global concurrency gate for external parser processes (Python / Go / cargo).
 *
 * Spawning many AST helpers in parallel burns CPU and thrash the OS process
 * table on Windows. Serializing native toolchains is correctness-preserving:
 * each file still gets the same parse result, just not all at once.
 */
/**
 * Run `fn` exclusively with respect to other {@link withSpawnGate} callers
 * in this process. Errors propagate to the caller and do not break the queue.
 */
export declare function withSpawnGate<T>(fn: () => Promise<T>): Promise<T>;
/** Test helper — reset queue between cases. */
export declare function resetSpawnGateForTests(): void;
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