import primus client in client JS #768

Version:
node 12.18.3
primus 8.0.1
ws 7.4.0

Environment:

• Operating system:
• windows 10
• Browser:
• chrome
• Node.js:
• 12.18.3

I am new to JS and its eco system. I used create-react-app to setup the client side, and server side is express server.
I used primus.save() to generate primus-client.js and save in the source dir. This module is then imported into client side JS which is a middleware for redux. When I start the react by "npm run start", I am getting the following errors
How can I fix this? Thank a lot.

Failed to compile.

src\client\primus-client.js
Line 264:44: Expected an assignment or function call and instead saw an expression no-unused-expressions
Line 2029:37: Unexpected use of 'self' no-restricted-globals
Line 2029:71: Unexpected use of 'self' no-restricted-globals
Line 2403:76: Unexpected use of 'self' no-restricted-globals
Line 2403:99: Unexpected use of 'self' no-restricted-globals
Line 2523:21: Unexpected use of 'location' no-restricted-globals
Line 2524:32: Unexpected use of 'location' no-restricted-globals
Line 2526:32: Unexpected use of 'location' no-restricted-globals
Line 2526:59: Unexpected use of 'location' no-restricted-globals
Line 3622:67: 'MozWebSocket' is not defined no-undef

Search for the keywords to learn more about each error.