Leverage export conditions to know whether the environment is development or production(/staging/...).

import { isDev } from 'is-dev'
// returns true in development
// returns false in production(/staging/...)
console.log(isDev)

How it works is dead simple:

// node_modules/is-dev/package.json
"exports": {
  "development": "./export-true.mjs",
  "default": "./export-false.mjs"
}

Currently works in:
✅ Vite
❌ Node.js

[!NOTE] Once Vite uses Rolldown (i.e. full-bundle mode), this package will work for Vite-based app.