@seamstack/elysia

Elysia backend adapter for SeamStack — mounts a Seam frontend on an Elysia app and serves built assets.

pnpm add @seamstack/elysia elysia @elysiajs/node

Usage

Wire the adapter in seam.config.ts:

import { defineWeave } from '@seamstack/cli'
import vite from '@seamstack/vite/adapter'
import elysia from '@seamstack/elysia/adapter'

export default defineWeave({
  fabric: [vite({ root: './client' }), elysia({ entry: './server/index.ts' })],
  port: 4567,
})

In your Elysia server, destructure { inlay, host, port } from seam() and .use(inlay) after your routes. inlay is a Promise<Elysia> — Elysia awaits it before listening.

import { Elysia } from 'elysia'
import { node } from '@elysiajs/node'
import { seam } from '@seamstack/elysia'

const { inlay, host, port } = seam()

new Elysia({ adapter: node() })
  .get('/api/hello', () => ({ msg: 'hi from elysia' }))
  .use(inlay)
  .listen({ hostname: host, port }, () =>
    console.log(`[elysia] listening on http://${host}:${port}`),
  )

inlay is inert in dev (Vite/Astro/Angular handle the frontend then). In prod it serves the built SPA via @elysiajs/static from the manifest written by seam build.

More

See the SeamStack README for the bigger picture, the mix-and-match support table, and CLI docs.