feat: add Elysia adapter

[wobsoriano]

What kind of change does this PR introduce?

Feature

What is the current behavior?

@supabase/server ships framework adapters for Hono and H3 / Nuxt, but not for Elysia. Users building APIs with Elysia have to wire up Supabase auth manually with the core primitives.

What is the new behavior?

Adds @supabase/server/adapters/elysia, a first-class plugin adapter for Elysia. Elysia has been gaining significant traction in the TypeScript ecosystem, particularly in the Bun community, for its end-to-end type safety and expressive plugin API.

Usage with a plain Elysia app:

import { Elysia } from 'elysia'
import { withSupabase } from '@supabase/server/adapters/elysia'

const app = new Elysia()
  .use(withSupabase({ auth: 'user' }))
  .get('/games', async ({ supabaseContext }) => {
    const { data: myGames } = await supabaseContext.supabase
      .from('favorite_games')
      .select()

    return myGames
  })

app.listen(3000)

Per-route auth using scoped groups:

const app = new Elysia()
  .get('/health', () => ({ status: 'ok' }))
  .group('/api', (app) =>
    app
      .use(withSupabase({ auth: 'user' }))
      .get('/profile', ({ supabaseContext }) => supabaseContext.userClaims),
  )

Custom error handling via Elysia's onError:

const app = new Elysia()
  .use(withSupabase({ auth: 'user' }))
  .onError(({ code, error, status }) => {
    if (code !== 'SupabaseAuthError') return

    const cause = error.cause as { code?: string; status?: number } | undefined

    return status((cause?.status as 401) ?? 500, {
      error: error.message,
      code: cause?.code,
    })
  })

Additional context

• Uses Elysia's .resolve() hook with .as('scoped') so the context propagates to parent app routes.
• Auth failures throw a registered SupabaseAuthError, which integrates with Elysia's standard onError flow and preserves the original AuthError on error.cause.Consumers discriminate on code === 'SupabaseAuthError' in onError without needing to import the class.
• Test coverage mirrors the Hono and H3 adapter tests.
• Docs and package metadata were updated to include Elysia in the adapter tables, exports, and generated API docs.

[pkg-pr-new]

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npm i https://pkg.pr.new/@supabase/server@46

commit: 2fbc72f