“Cannot GET / ” webpack-dev-server

In order to prevent this question being marked as duplicate, I want to mention that I have referred to a number of similar SO questions and tried the accepted/most upvoted answers, but those did not help:

  1. webpack-dev-server ‘Cannot GET /’
  2. Cannot GET / – localhost 8080 not working with webpack dev server
  3. Cannot GET / error running hello world in webpack
  4. Plugin not defined in webpack configuration file

I am trying to create a simple Javascript application which uses RxJs, by following the tutorial at https://www.javatpoint.com/rxjs-first-example.

When I start webpack-dev-server, I get “Cannot GET /” error.

I have committed the code here to a git repository for it to be reproduced easily. Here are the steps:

git clone https://github.com/phalgunv/basic-rxjs-starter.git
npm run start

Open “http://localhost:8080/”, I get the error
enter image description here

What am I missing here?