Environment Variables and Config Typing
Type process.env with a validated config module.
Welcome
Typing process.env prevents runtime errors from missing or mistyped environment variables.
The Problem
process.env values are always string | undefined. Accessing them without checking causes bugs.
const port = process.env.PORT; // string | undefined
// server.listen(port); // could be undefined!All lessons in this course
- Setting Up TypeScript with Node.js
- Typing Express Request and Response
- Typed Middleware and Error Handlers
- Environment Variables and Config Typing