What is the type of issue?

Example code is not working

What is the issue?

This part:

// Without 'setup', type will be missing
const error = new Elysia()
    .get('/', ({ a }) => a)

is missing .use(setup) before .get(...)

Where did you find it?

https://elysiajs.com/essential/plugin.html#plugin-deduplication:~:text=%27a%27)-,//%20Without%20%27setup%27%2C%20type%20will%20be%20missing%0Aconst,),-Property%20%27a%27%20does