/**
 * @fileoverview Token counting and cost estimation utilities for AI API usage.
 *
 * This module provides utilities for estimating token usage and associated costs
 * when using various AI APIs including Google's Gemini and OpenRouter models.
 * It implements accurate token counting using model-specific tokenizers and maintains
 * current pricing information for different AI models.
 *
 * Key responsibilities:
 * - Counting tokens for input and output text using model-specific tokenizers
 * - Calculating approximate API costs based on token usage and model
 * - Tracking different pricing tiers for various AI models
 * - Providing cost information for review outputs
 * - Supporting cost-aware decision making for API usage
 *
 * These utilities help users understand the resource usage and costs associated
 * with their code reviews, enabling better planning and resource allocation.
 */
/**
 * Utility functions for estimating token counts and costs for AI API calls
 */
/**
 * Count tokens in a text using the appropriate tokenizer for a model
 * @param text Text to count tokens for
 * @param modelName Name of the model (optional)
 * @returns Token count
 */
export declare function estimateTokenCount(text: string, modelName?: string): number;
/**
 * Calculate the estimated cost for an AI API call
 * @param inputTokens Number of input tokens
 * @param outputTokens Number of output tokens
 * @param modelName Name of the model used
 * @returns Estimated cost in USD
 */
export declare function calculateCost(inputTokens: number, outputTokens: number, modelName?: string): number;
/**
 * Format a cost value as a currency string
 * @param cost Cost value in USD
 * @returns Formatted cost string
 */
export declare function formatCost(cost: number): string;
/**
 * Cost information for an API call
 */
export interface CostInfo {
    inputTokens: number;
    outputTokens: number;
    totalTokens: number;
    estimatedCost: number;
    formattedCost: string;
    cost: number;
    passCount?: number;
    perPassCosts?: PassCostInfo[];
    contextMaintenanceFactor?: number;
}
/**
 * Cost information for a single pass in a multi-pass review
 */
export interface PassCostInfo {
    passNumber: number;
    inputTokens: number;
    outputTokens: number;
    totalTokens: number;
    estimatedCost: number;
}
/**
 * Calculate cost information for an API call based on text
 * @param inputText Input text sent to the API
 * @param outputText Output text received from the API
 * @param modelName Name of the model used
 * @returns Cost information
 */
export declare function getCostInfoFromText(inputText: string, outputText: string, modelName?: string): CostInfo;
/**
 * Calculate cost information for an API call based on token counts
 * @param inputTokens Number of input tokens
 * @param outputTokens Number of output tokens
 * @param modelName Name of the model used
 * @returns Cost information
 */
export declare function getCostInfo(inputTokens: number, outputTokens: number, modelName?: string): CostInfo;