/**
 * Process-wide performance profile.
 *
 * `WRONGSTACK_PERF_PROFILE` (alias `WSTACK_PERF_PROFILE`):
 *   - `balanced` (default) — current throughput-oriented defaults
 *   - `frugal` / `cimri` — lower CPU concurrency, leaner SQLite caches,
 *     coarser UI stream paint. Correctness and APIs unchanged.
 */
export type PerfProfile = 'balanced' | 'frugal';
/** Resolve the active profile from the environment (evaluated each call). */
export declare function getPerfProfile(): PerfProfile;
export declare function isFrugalPerf(): boolean;
/** Parallel file-parse batch size for the codebase indexer. */
export declare function indexParallelBatchSize(availableCores: number): number;
/**
 * SQLite page-cache / mmap sizes in KiB (negative PRAGMA = KiB units for cache).
 * Frugal keeps correctness; just spends less RSS.
 */
export declare function sqliteCachePragmas(): {
    cacheSizeKiB: number;
    mmapBytes: number;
};
/** sage store defaults (slightly smaller than index). */
export declare function SageCachePragmas(): {
    cacheSizeKiB: number;
    mmapBytes: number;
};
/**
 * TUI stream paint interval. Higher = fewer React dispatches (less CPU/heap
 * churn). Balanced keeps the historical ~10fps; frugal ~6–7fps.
 */
export declare function tuiStreamFlushMs(): number;
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