/**
 * Metrics utilities for token estimation and performance analysis
 */
/**
 * Simple token estimation based on common tokenizers
 *
 * SECURITY FIX (SEC-001): Added input size validation to prevent ReDoS attacks
 */
export declare function estimateTokens(text: string, tokenizer?: "gpt-5" | "gpt-4.5" | "gpt-4o" | "claude-3.5" | "claude-sonnet-4.5" | "gemini-2.0" | "gemini-2.5-pro" | "gemini-3-pro" | "llama-4" | "claude-3" | "claude-2" | "gemini-1.5" | "gemini-pro" | "palm-2" | "llama-3" | "mistral" | "mixtral" | "o200k" | "cl100k"): number;
/**
 * Calculate compression metrics
 */
export interface CompressionMetrics {
    originalBytes: number;
    compressedBytes: number;
    originalTokens: number;
    compressedTokens: number;
    byteCompressionRatio: number;
    tokenCompressionRatio: number;
    byteSavingsPercent: number;
    tokenSavingsPercent: number;
}
export declare function calculateCompressionMetrics(original: string, compressed: string, tokenizer?: "gpt-5" | "gpt-4.5" | "gpt-4o" | "claude-3.5" | "claude-sonnet-4.5" | "gemini-2.0" | "gemini-2.5-pro" | "gemini-3-pro" | "llama-4" | "claude-3" | "claude-2" | "gemini-1.5" | "gemini-pro" | "palm-2" | "llama-3" | "mistral" | "mixtral" | "o200k" | "cl100k"): CompressionMetrics;
/**
 * Format metrics for display
 */
export declare function formatMetrics(metrics: CompressionMetrics, formatName: string): string;
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