/**
 * Message Builder Utility
 * Centralized logic for building message arrays from TextGenerationOptions
 * Enhanced with multimodal support for images
 */
import type { ModelMessage } from "ai";
import type { GenerateOptions, MultimodalChatMessage, StreamOptions, TextGenerationOptions } from "../types/index.js";
/**
 * Type-safe conversion from MultimodalChatMessage[] to ModelMessage[]
 * Filters out invalid content and ensures strict ModelMessage contract compliance
 */
export declare function convertToModelMessages(messages: MultimodalChatMessage[]): ModelMessage[];
/**
 * Build a properly formatted message array for AI providers
 * Combines system prompt, conversation history, and current user prompt
 * Supports both TextGenerationOptions and StreamOptions
 * Enhanced with CSV file processing support
 */
export declare function buildMessagesArray(options: TextGenerationOptions | StreamOptions): Promise<ModelMessage[]>;
/**
 * Process the unified files array with auto-detection.
 * Handles lazy file registration, full processing, and preview injection.
 *
 * Exported so providers that bypass BaseProvider.generate() (e.g.
 * GoogleVertex's native @google/genai path) can still preprocess
 * `input.files` — without this, mimetype-hint and text-file inputs
 * would silently never reach the model on those paths.
 */
export declare function processUnifiedFilesArray(options: GenerateOptions, maxSize: number, provider: string): Promise<void>;
/**
 * Build multimodal message array with image support
 * Detects when images are present and routes through provider adapter
 */
export declare function buildMultimodalMessagesArray(options: GenerateOptions, provider: string, model: string): Promise<MultimodalChatMessage[]>;