import Onboard from '@web3-onboard/core'
import mewWallet from '@web3-onboard/mew-wallet'

const mewWalletModule = mewWallet()

const onboard = Onboard({
  // ... other Onboard options
  wallets: [
    mewWalletModule
    //... other wallets
  ]
})

const connectedWallets = await onboard.connectWallet()
console.log(connectedWallets)