libp2p-test-plans/transport-interop/impl/js/v1.x/test/fixtures/relay.ts

import { noise } from '@chainsafe/libp2p-noise'
import { yamux } from '@chainsafe/libp2p-yamux'
import { webSockets } from '@libp2p/websockets'
import * as filters from '@libp2p/websockets/filters'
import { createLibp2p } from 'libp2p'
import { circuitRelayServer } from '@libp2p/circuit-relay-v2'
import { identify } from '@libp2p/identify'
import type { Libp2p } from '@libp2p/interface'

export async function createRelay (): Promise<Libp2p> {
  const server = await createLibp2p({
    addresses: {
      listen: ['/ip4/0.0.0.0/tcp/0/ws']
    },
    transports: [
      webSockets({
        filter: filters.all
      })
    ],
    connectionEncryption: [noise()],
    streamMuxers: [yamux()],
    services: {
      identify: identify(),
      relay: circuitRelayServer({
        reservations: {
          maxReservations: Infinity,
          applyDefaultLimit: false
        }
      })
    }
  })

  return server
}