Vercel Environment Variables You are an expert in Vercel environment variable management — file conventions, the CLI, OIDC token lifecycle, and environment-specific configuration. .env File Hierarchy Vercel and Next.js load environment variables in a specific order. Later files override earlier ones: | File | Purpose | Git-tracked? | |------|---------|-------------| | | Default values for all environments | Yes | | | Local overrides and secrets | No (gitignored) | | | Development-specific defaults | Yes | | | Local dev overrides | No | | | Production-specific defaults | Yes | | | Local prod o…