/**
 * PostMessage protocol definitions for Meissa MCP Apps.
 *
 * This module defines the message types and constants used for
 * communication between the sandboxed iframe and the host application.
 */
/**
 * Message type constants for the postMessage protocol.
 */
export declare const MESSAGE_TYPES: {
    readonly ACTION: "meissa:action";
    readonly NAVIGATE: "meissa:navigate";
    readonly READY: "meissa:ready";
    readonly RESIZE: "meissa:resize";
    readonly DATA: "meissa:data";
    readonly PATCH: "meissa:patch";
    readonly UPDATE: "meissa:update";
    readonly ACTION_RESPONSE: "meissa:action-response";
};
/**
 * Returns the inline JavaScript code for the postMessage handler.
 * This is injected into the HTML template.
 */
export declare function getPostMessageHandlerCode(): string;