/**
* This file is a testable wrapper around index.ts
* This pattern helps overcome the ESM module limitations in Jest
*/
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import * as fredServer from "./index.js";
/**
* Wrapper class for the FRED MCP Server
* Designed to be easily tested by providing mocking points
*/
export class FREDServerWrapper {
// References to dependency functions
private _createServer: () => McpServer;
private _startServer: (server: McpServer, transport: StdioServerTransport) => Promise<boolean>;
// Store server and transport as instance variables
private _server: McpServer | null = null;
private _transport: StdioServerTransport | null = null;
/**
* Create a new wrapper for the FRED server
* Allows for dependency injection during tests
*/
constructor(
createServerFn = fredServer.createServer,
startServerFn = fredServer.startServer
) {
this._createServer = createServerFn;
this._startServer = startServerFn;
}
/**
* Get access to the server instance
*/
get server(): McpServer | null {
return this._server;
}
/**
* Create the server instance
*/
initialize(): McpServer {
this._server = this._createServer();
return this._server;
}
/**
* Start the server with the given transport
* If no transport is provided, a new StdioServerTransport is created
*/
async start(transport?: StdioServerTransport): Promise<boolean> {
if (!this._server) {
this.initialize();
}
this._transport = transport || new StdioServerTransport();
// Start the server
return await this._startServer(this._server!, this._transport);
}
/**
* Convenience method to create and start the server in one step
*/
async createAndStart(): Promise<boolean> {
this.initialize();
return await this.start();
}
}
/**
* Main entry point when this file is executed directly
*/
async function main() {
const wrapper = new FREDServerWrapper();
const success = await wrapper.createAndStart();
if (!success) {
process.exit(1);
}
}
// Only run the main function if this file is executed directly
if (import.meta.url === `file://${process.argv[1]}`) {
main().catch((error) => {
console.error("Fatal error in main():", error);
process.exit(1);
});
}
export default new FREDServerWrapper();
