What @t3-oss/env is for Next.js, but built natively on Vite 8 and Rolldown. Define your environment variables once with a schema, and get validated, typed imports everywhere.

Why I Built This

I wrote about the four problems with plain Vite environment variables — no validation, no type safety, string-only values, and easy server/client leaks. This plugin solves all four.

Key Features

Typed virtual modules — import env with full IntelliSense
Server/client split with build-time leak detection
Zod v4 native validation with Standard Schema support (Valibot, ArkType)
Auto .d.ts generation for type safety without manual declarations
Platform presets for Vercel, Railway, Netlify
HMR .env watching — changes reload without restart

Technical Details

The plugin generates virtual modules at build time, splitting server and client variables into separate imports. If client code accidentally imports a server variable, the build fails — preventing secret leaks before they happen.

Getting started

Install @vite-env/core and add the plugin to your Vite config
Create an env.ts file with your schema
Import from virtual:env/client or virtual:env/server
Type-check your environment variables at build time

Why it matters

Environment variable bugs are silent and dangerous — a missing key returns undefined, a leaked secret exposes your backend. This plugin makes environment variables type-safe and validated, catching errors at build time instead of runtime.