import { LLMInput } from "./types";
/**
 * Validate required fields on LLMInput.
 */
export declare function validateInput(input: any): LLMInput;
/**
 * Estimate cost using an average token length heuristic.
 */
export declare function calculateCost(inputStr: string, outputStr: string): number;
/**
 * Simple retry wrapper for async functions.
 */
export declare function retry<T>(fn: () => Promise<T>, retries?: number, delay?: number): Promise<T>;
/**
 * Generic postprocessing function. Extend as needed.
 */
export declare function postprocess(response: string, extraData?: any): string;
/**
 * Compute a unique SHA-256 hash based on the systemPrompt, userPrompt, and sorted parameter keys.
 */
export declare function computeTemplateHash(input: LLMInput): string;