@modelfetch/core/dist/index.js

Core utilities for MCP servers built with ModelFetch

/**
 * This module provides the foundational components for creating MCP servers that can be deployed
 * across various JavaScript/TypeScript runtimes.
 *
 * @example Basic Example
 * ```ts
 * import { createApp } from "@modelfetch/core";
 * import server from "./server";
 *
 * const app = createApp(server);
 * ```
 *
 * @example Advanced Example
 * ```ts
 * import { createApp } from "@modelfetch/core";
 * import server from "./server";
 *
 * const app = createApp({
 *   server,
 *   base: "/api",
 *   path: "/mcp",
 *   middleware: [authMiddleware, loggingMiddleware],
 *   pre: (app) => {
 *     app.get("/health", (c) => c.text("OK"));
 *   },
 *   post: (app) => {
 *     app.notFound((c) => c.text("Not found", 404));
 *   }
 * });
 * ```
 *
 * @module
 */
import { StreamableHTTPTransport } from "@hono/mcp";
import { Hono } from "hono";
/**
 * Creates an MCP server application from an MCP server implementation or configuration.
 */
export function createApp(arg) {
    const config = "connect" in arg ? { server: arg } : arg;
    const app = new Hono();
    const router = config.base ? app.basePath(config.base) : app;
    if (config.pre)
        config.pre(router);
    const path = (config.path ?? "") || "/mcp";
    if (config.middleware)
        for (const fn of config.middleware)
            router.use(path, fn);
    router.all(path, async (c) => {
        const transport = new StreamableHTTPTransport();
        await config.server.connect(transport);
        return transport.handleRequest(c);
    });
    if (config.post)
        config.post(router);
    return app;
}
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