Help understand with the compiled WebPack file

Hello. Help understand with the compiled WebPack file.
There is a multi-platform project in which there are several modules.
In one of them, a class named exampleClass is declared.
After running the jsBrowserWebpack task, the example.js file.
When viewing a file, it looks strange: there are no classes and functions.
I must not catch this file.
For example, how to create an instance of the exampleClass class.
If you do this:

<! DOCTYPE HTML>

Before the script ...

... after the script

exampleClass error not defined.