/**
 * NitroStack App Mode
 *
 * Central utility for detecting and switching between OpenAI Apps SDK
 * and MCP Apps protocol conventions.
 *
 * Set via the `NITROSTACK_APP_MODE` or `APP_MODE` environment variable:
 *   - 'universal' (default) — Supports both MCP Apps (Claude) and OpenAI Apps SDK (ChatGPT)
 *   - 'openai'              — OpenAI Apps SDK / ChatGPT conventions only
 *   - 'mcp-app'             — MCP Apps spec (Claude, universal MCP hosts) only
 *
 * @module
 */
/**
 * Supported app modes
 */
export type AppMode = 'openai' | 'mcp-app' | 'universal';
/**
 * MIME type used by MCP Apps spec for UI resources.
 * Hosts use this MIME type to activate the MCP Apps bridge (JSON-RPC over postMessage).
 */
export declare const RESOURCE_MIME_TYPE_MCP_APP = "text/html;profile=mcp-app";
/**
 * MIME type used by OpenAI Apps SDK for UI resources (standard HTML).
 */
export declare const RESOURCE_MIME_TYPE_OPENAI = "text/html";
/**
 * Get the current NitroStack app mode from environment.
 *
 * Reads `NITROSTACK_APP_MODE` or `APP_MODE` env variable with lenient parsing:
 *   - 'openai', 'chatgpt' → 'openai'
 *   - 'mcp-app', 'mcpapp', 'mcp_app' → 'mcp-app'
 *   - 'universal', 'all', 'both' → 'universal'
 *   - anything else (or unset) → 'universal' (default)
 *
 * @returns The active app mode
 */
export declare function getAppMode(): AppMode;
/**
 * Check if the server is running in MCP Apps mode.
 * Returns true if mode is 'mcp-app' or 'universal'.
 */
export declare function isMcpAppMode(): boolean;
/**
 * Check if the server is running in OpenAI Apps SDK mode.
 * Returns true if mode is 'openai' or 'universal'.
 */
export declare function isOpenAiMode(): boolean;
/**
 * Get the appropriate MIME type for widget resources based on current mode.
 *
 * - OpenAI mode: `text/html` (standard)
 * - MCP Apps/Universal mode: `text/html;profile=mcp-app`
 */
export declare function getWidgetMimeType(): string;
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