So when I am trying to import class from another javascript file, I am getting error in console like this:
Access to Script at \'file:///home/../.../JavaScri
file:// requests will not work, but you can run a local webserver (polymer serve, express, etc.) to use HTTP requests instead. You could even use the following Chrome extension to run a local webserver.
https://chrome.google.com/webstore/detail/web-server-for-chrome/ofhbbkphhbklhfoeikjpcbhemlocgigb?hl=en