TypeScript Example

[kimfucious]

Hi there,

I'm trying to use your fine docs to run Express as a serverless function on Netlify, but my function file is written in TypeScript, which is necessary for my use case.

I've tried:

const handler = serverless(app);
export { handler };

Unfortunately, this results in a 404 when I try to do a get on a route when the function is being served by netlify functions:serve, using the Netlify CLI.

Am I missing a step here? Did I do the export wrong? A TypeScript example would be very useful here.

Thanks!

[kimfucious]

Okay, it took me a while, but it appears I was missing an important thing, and the export wasn't the issue.

const app = express();
const router = express.Router();
const functionName = "api";
const routerBasePath =
    process.env.NODE_ENV === "development"
        ? `/${functionName}`
        : `/.netlify/functions/${functionName}/`;
app.use(routerBasePath, router);
router.use(cors());

If I don't have the routerBasePath setup with the function name, things don't work.

Frankly, I have no idea why that's needed, so any explanation around that would be enlightening.