/**
 * Performance Optimization Service
 *
 * Provides caching and optimization strategies for dependency resolution:
 * - In-memory caching of frequently accessed lock files
 * - Parallel dependency downloads
 * - Cache warming strategies
 * - Event-based invalidation (PRS-017 R15)
 */
import type { LockFile } from './types.js';
/**
 * Performance optimizer with in-memory caching.
 *
 * PRS-017 R15: Cache entries are valid until explicitly invalidated
 * by `invalidateCache()` or `clearAllCaches()`. The previous TTL-based
 * approach could serve stale data (within window) or unnecessarily
 * re-read unchanged files (after expiry). Event-based invalidation
 * via `processManifestChanges()` and `processLockFileChanges()` is
 * always correct and immediate.
 */
export declare class PerformanceOptimizer {
    private readonly lockFileCache;
    private readonly manifestCache;
    /**
     * Gets a lock file from cache or loads it from disk.
     */
    getCachedLockFile(workspaceRoot: string): Promise<LockFile | undefined>;
    /**
     * Gets a manifest file from cache or loads it from disk.
     */
    getCachedManifest(manifestPath: string): Promise<unknown>;
    private getCached;
    /**
     * Invalidates cache for a specific workspace.
     * Called when model.lock or model.yaml changes (event-based, PRS-017 R15).
     */
    invalidateCache(workspaceRoot: string): void;
    /**
     * Clears all caches.
     */
    clearAllCaches(): void;
    /**
     * Gets cache statistics.
     */
    getCacheStats(): {
        lockFiles: number;
        manifests: number;
    };
    /**
     * Normalizes a file path for cache keys.
     */
    private normalizePath;
}
/**
 * Gets the global performance optimizer instance.
 */
export declare function getGlobalOptimizer(): PerformanceOptimizer;
/**
 * Resets the global optimizer (useful for testing).
 */
export declare function resetGlobalOptimizer(): void;