Need to update usage of RateLimit itself and its options (delayMs)

[humoyun]

Hi Ben,

I just want to let you know current RateLimit in startServer.ts is obsolete, there is breaking change on express-rate-limit api:

• v3 changes: Removed delayAfter and delayMs options; they were moved to a new module: express-slow-down.

Also, now RateLimit usage also updated:
Instead of creating RateLimit instance directly, now it should be used as a factory method:

Usage taken from its official npm page:

const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100 // limit each IP to 100 requests per windowMs
});

And here is the usage of express-slow-down:

const slowDown = require("express-slow-down");
 
app.enable("trust proxy"); // only if you're behind a reverse proxy (Heroku, Bluemix, AWS if you use an ELB, custom Nginx setup, etc)
 
const speedLimiter = slowDown({
  windowMs: 15 * 60 * 1000, // 15 minutes
  delayAfter: 100, // allow 100 requests per 15 minutes, then...
  delayMs: 500 // begin adding 500ms of delay per request above 100:
  // request # 101 is delayed by  500ms
  // request # 102 is delayed by 1000ms
  // request # 103 is delayed by 1500ms
  // etc.
});
 
//  apply to all requests
app.use(speedLimiter);