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Type-safe environment config modules

Follow this best practice to manage environment variables in TypeScript applications with full type safety and clear server/public boundaries.

better-env exports configSchema to define typed env modules and recommends placing them in feature-level config.ts files (for example src/lib/auth/config.ts and src/lib/database/config.ts).

Learn more:

references/config-schema.md

Validate existence of all env variables in the current environment

Run env validation early so missing or invalid values fail fast before dev, build, or deploy steps.

better-env validate --environment <name> loads .env* files with Next.js semantics, discovers src/lib/*/config.ts modules, and checks every declared variable from your configSchema modules.

If your dotenv files intentionally include keys that are not referenced by config modules, add per-env suppressions in better-env.ts: