convert webpack to typescript

This allows us to add a mock library for simulating the real device.

Signed-off-by: Sean Cross <sean@xobs.io>

mock/webpack.farpatch.ts

@@ -0,0 +1,10 @@
+import { Request, Application, Response } from 'express';
+
+export function getVoltages(request: Request, response: Response) {
+  // ...
+  response.send('these are some voltages');
+}
+
+export function installMiddlewares(app: Application) {
+  app.get('/voltages', getVoltages);
+}