How to prevent js files from being displayed if you enter the path to the file in the url?

Question

JavaScript

Hello.
Tell me how you can prevent showing data from js, ts files
Example:
Angular2 project on typescript if a person enters the path to the app/main.ts, main.js file in the url, then these files are displayed, how to prevent this?

Answer 1

Listen, what's your secret code? Don't imagine the impossible. Use an obfuscator as a last resort.

Answer 2

No, how do you imagine it? How do you think the browser will execute them if it does not have access to them?