import { z } from "zod";
/**
 * Configuration options for image transport
 */
export interface ImageTransportOptions {
    maxSize: number;
    allowedMimeTypes: string[];
    compressionQuality?: number;
}
/**
 * Schema for content annotations
 */
export declare const ContentAnnotationsSchema: z.ZodOptional<z.ZodObject<{
    audience: z.ZodOptional<z.ZodArray<z.ZodEnum<["user", "assistant"]>, "many">>;
    priority: z.ZodOptional<z.ZodNumber>;
    lastModified: z.ZodOptional<z.ZodString>;
}, "strip", z.ZodTypeAny, {
    audience?: ("user" | "assistant")[] | undefined;
    priority?: number | undefined;
    lastModified?: string | undefined;
}, {
    audience?: ("user" | "assistant")[] | undefined;
    priority?: number | undefined;
    lastModified?: string | undefined;
}>>;
/**
 * Schema for image content validation
 */
export declare const ImageContentSchema: z.ZodObject<{
    type: z.ZodLiteral<"image">;
    data: z.ZodString;
    mimeType: z.ZodString;
    annotations: z.ZodOptional<z.ZodObject<{
        audience: z.ZodOptional<z.ZodArray<z.ZodEnum<["user", "assistant"]>, "many">>;
        priority: z.ZodOptional<z.ZodNumber>;
        lastModified: z.ZodOptional<z.ZodString>;
    }, "strip", z.ZodTypeAny, {
        audience?: ("user" | "assistant")[] | undefined;
        priority?: number | undefined;
        lastModified?: string | undefined;
    }, {
        audience?: ("user" | "assistant")[] | undefined;
        priority?: number | undefined;
        lastModified?: string | undefined;
    }>>;
}, "strip", z.ZodTypeAny, {
    type: "image";
    data: string;
    mimeType: string;
    annotations?: {
        audience?: ("user" | "assistant")[] | undefined;
        priority?: number | undefined;
        lastModified?: string | undefined;
    } | undefined;
}, {
    type: "image";
    data: string;
    mimeType: string;
    annotations?: {
        audience?: ("user" | "assistant")[] | undefined;
        priority?: number | undefined;
        lastModified?: string | undefined;
    } | undefined;
}>;
export type ImageContent = z.infer<typeof ImageContentSchema>;
/**
 * Default configuration for image transport
 */
export declare const DEFAULT_IMAGE_OPTIONS: ImageTransportOptions;
/**
 * Validates image content against transport options
 */
export declare function validateImageTransport(content: ImageContent, options?: ImageTransportOptions): void;
/**
 * Prepares image content for transport
 * This function can be extended to handle compression, format conversion, etc.
 */
export declare function prepareImageForTransport(content: ImageContent, options?: ImageTransportOptions): ImageContent;
/**
 * Gets the size of a base64 image in bytes
 */
export declare function getBase64ImageSize(base64String: string): number;
/**
 * Utility type for messages containing image content
 */
export type MessageWithImage = {
    result?: {
        content?: Array<ImageContent | {
            type: string;
            [key: string]: unknown;
        }>;
    };
    [key: string]: unknown;
};
/**
 * Checks if a message contains image content
 */
export declare function hasImageContent(message: unknown): message is MessageWithImage;