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Environment Variables

Create React App

https://create-react-app.dev/docs/adding-custom-environment-variables/

Use a prefix REACT_APP_

REACT_APP_MAP=
REACT_APP_WEBSITE_URL=
.env

Usage
process.env.REACT_APP_MAP;
process.env.REACT_APP_WEBSITE_URL;
Next.js

https://nextjs.org/docs/api-reference/next.config.js/environment-variables

Use a prefix NEXT_PUBLIC_

NEXT_PUBLIC_MAP=
NEXT_PUBLIC_WEBSITE_URL=
.env

Usage
process.env.NEXT_PUBLIC_MAP;
process.env.NEXT_PUBLIC_WEBSITE_URL;
Vite.js

https://vitejs.dev/guide/env-and-mode.html

Use a prefix VITE_

VITE_MAP=
VITE_WEBSITE_URL=
.env

Usage
import.meta.env.VITE_MAP;
import.meta.env.VITE_WEBSITE_URL;