[DRAFT] Check bundlers

[Siemienik]

As @jacekkoziol shown in a #154 and fixes in #155, Bundlers like Webpack5 can change compressed libs' behaviour. So it is worth to test them. It might be resolved by one of two ways:

• adding a test witch will use a bundler and execute all testes with using compressed code.
• adding an example which will run in the real environment.

Which bundlers and which way to use (or both) will be clarified.