Init. Map does not function and only working on backend at the moment.

node_modules/engine.io/build/transports/polling-jsonp.d.ts

@@ -0,0 +1,24 @@
+import { Polling } from "./polling";
+export declare class JSONP extends Polling {
+    private readonly head;
+    private readonly foot;
+    /**
+     * JSON-P polling transport.
+     *
+     * @api public
+     */
+    constructor(req: any);
+    /**
+     * Handles incoming data.
+     * Due to a bug in \n handling by browsers, we expect a escaped string.
+     *
+     * @api private
+     */
+    onData(data: any): void;
+    /**
+     * Performs the write.
+     *
+     * @api private
+     */
+    doWrite(data: any, options: any, callback: any): void;
+}