import type { GuardInput, ProcessedInput } from "../types.js";
/**
 * Process guard input and return normalized ProcessedInput
 *
 * Auto-detection:
 * - string starting with http:// or https:// → fetch URL
 * - string not starting with http(s):// → plain text
 * - Blob/File → process based on MIME type
 * - URL object → fetch URL
 */
export declare function processInput(input: GuardInput): Promise<ProcessedInput>;
/**
 * Check if a model supports vision (multimodal) input
 */
export declare function isVisionModel(model: string): boolean;
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