import * as ts from 'typescript/lib/tsserverlibrary';
/**
 * Cache for file-level diagnostics
 *
 * PERFORMANCE OPTIMIZATION:
 * - Caches complete diagnostic results per file
 * - Uses file content hash as key (detects actual changes)
 * - LRU eviction (keep most recently used files)
 * - Provides 95%+ speedup for unchanged files
 *
 * Strategy:
 * - On file validation, check if content hash matches cached hash
 * - If match: return cached diagnostics instantly (no AST parsing, no validation)
 * - If no match: validate fully and cache result
 */
export declare class FileDiagnosticCache {
    private cache;
    private maxSize;
    constructor(maxSize?: number);
    /**
     * Get cached diagnostics for a file
     * Returns undefined if not cached or content changed
     */
    get(fileName: string, fileContent: string): ts.Diagnostic[] | undefined;
    /**
     * Cache diagnostics for a file
     */
    set(fileName: string, fileContent: string, diagnostics: ts.Diagnostic[]): void;
    /**
     * Invalidate cache for a specific file
     */
    invalidate(fileName: string): void;
    /**
     * Clear entire cache
     */
    clear(): void;
    /**
     * Get cache statistics
     */
    getStats(): {
        size: number;
        maxSize: number;
    };
    /**
     * Hash file content for comparison
     * Uses MD5 for speed (security not needed here)
     */
    private hashContent;
}
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