Initial import

src/types/index.ts

@@ -0,0 +1,25 @@
+import { ProgressNotification, PingRequest } from "./schema.js";
+export * from "./schema.js";
+
+export const CONNECTION_CLOSED_ERROR = -1;
+
+export class McpError extends Error {
+  constructor(
+    public readonly code: number,
+    message: string,
+    public readonly data?: unknown,
+  ) {
+    super(`MCP error ${code}: ${message}`);
+  }
+}
+
+export type Progress = Pick<
+  ProgressNotification["params"],
+  "progress" | "total"
+>;
+
+export const PROGRESS_NOTIFICATION_METHOD: ProgressNotification["method"] =
+  "notifications/progress";
+export const PING_REQUEST_METHOD: PingRequest["method"] = "ping";
+
+export type RequestId = string | number;