interier/routes/include/main.js

import { Elysia } from 'elysia'

import { Eta } from "eta"
const eta = new Eta({ views: "./templates" })

import Meteostanica from '../../utils/meteostanica'

export default (langName) => new Elysia()
  .get('/', ({ set }) => {
    const data = Meteostanica.getData()

    set.headers['content-type'] = 'text/html; charset=utf8'
    return eta.render(`${langName}/index`, { data })
  })