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Elysia is built on top of the Web Standard Request/Response API, which means it runs on Deno without any additional adapter. You simply pass app.fetch to Deno.serve instead of calling .listen().
1

Create your Elysia app and pass it to Deno.serve

Replace .listen() with Deno.serve(app.fetch):
import { Elysia } from 'elysia'

const app = new Elysia()
  .get('/', () => 'Hello Elysia')

Deno.serve(app.fetch)
2

Run the server with deno serve

deno serve --watch src/index.ts
The --watch flag enables hot-reload on file changes.

​
Changing the port

Pass a configuration object as the first argument to Deno.serve to set a custom port: 
Deno.serve({ port: 8787 }, app.fetch)

​
pnpm peer dependencies

If you use pnpm, install peer dependencies manually: 
pnpm add @sinclair/typebox openapi-types

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