From where, is socket.io.js served?

[john.smith...@gmail.com]

While trying out Karma, after going through normal installation, init, I run  node_modules/karma/bin/karma start karma.conf.js and Chrome browser opens.

 

Here is my understanding

 

1)    Homepage served is /node_modules/karma/static/client.html which has two scripts

 

<script src="socket.io/socket.io.js"></script>

<script src="karma.js"></script>

 

2)    karma.js comes from /node_modules/karma/static/karma.js

3)    Under my project directory, I am seeing two socket.io.js files

 

./node_modules/socket.io/lib/socket.io.js

./node_modules/socket.io-client/dist/socket.io.js

 

And none of them is being loaded in Chrome. Changes I made in those files are not showing up in Chrome debugger. That is how I know.

 

My question is that where socket.io/socket.io.js comes from? In other words, what is the source location of file socket.io/socket.io.js?