Environment Variable.js file cant be show in Browser

Hi Team,
My React application running with backend API URL was feed from environment_varibles.js file when I accessing that application using browser checked in inspect mode I am able to see that Environment environment_varibles.js file and content of the file. I want to hide that file when client inspect the browser it wont show.

Note: without using .env I want to achieve that.

Thanks, in advance for your time to read this post and response.