Mount

WinterTC is a standard for building HTTP Server behind Cloudflare, Deno, Vercel, and others.

It allows web servers to run interoperably across runtimes by using Request, and Response.

Elysia is WinterTC compliant. Optimized to run on Bun, but also support other runtimes if possible.

This allows any framework or code that is WinterCG compliant to be run together, allowing frameworks like Elysia, Hono, Remix, Itty Router to run together in a simple function.

Mount

To use .mount, simply pass a fetch function:

import { Elysia } from 'elysia'
import { Hono } from 'hono'

const hono = new Hono()
	.get('/', (c) => c.text('Hello from Hono!'))

const app = new Elysia()
    .get('/', () => 'Hello from Elysia')
    .mount('/hono', hono.fetch)

Any framework that use Request, and Response can be interoperable with Elysia like

• Hono
• Nitro
• H3
• Nextjs API Route
• Nuxt API Route
• SvelteKit API Route

And these can be use on multiple runtimes like:

• Bun
• Deno
• Vercel Edge Runtime
• Cloudflare Worker
• Netlify Edge Function

If the framework supports a .mount function, you can also mount Elysia inside another framework:

import { Elysia } from 'elysia'
import { Hono } from 'hono'

const elysia = new Elysia()
    .get('/', () => 'Hello from Elysia inside Hono inside Elysia')

const hono = new Hono()
    .get('/', (c) => c.text('Hello from Hono!'))
    .mount('/elysia', elysia.fetch)

const main = new Elysia()
    .get('/', () => 'Hello from Elysia')
    .mount('/hono', hono.fetch)
    .listen(3000)

Reusing Elysia

Moreover, you can re-use multiple existing Elysia projects on your server.

import { Elysia } from 'elysia'

import A from 'project-a/elysia'
import B from 'project-b/elysia'
import C from 'project-c/elysia'

new Elysia()
    .mount(A)
    .mount(B)
    .mount(C)

If an instance passed to mount is an Elysia instance, it will be resolved with use automatically, providing type-safety and support for Eden by default.

This makes the possibility of an interoperable framework and runtime a reality.