React

        import { Web3OnboardProvider, init } from '@web3-onboard/react'
import injectedModule from '@web3-onboard/injected-wallets'
const INFURA_KEY = ''
const ethereumRopsten = {
  id: '0x3',
  token: 'rETH',
  label: 'Ethereum Ropsten',
  rpcUrl: `https://ropsten.infura.io/v3/${INFURA_KEY}`
}
const chains = [ethereumRopsten]
const wallets = [injectedModule()]
const web3Onboard = init({
  wallets,
  chains,
  appMetadata: {
    name: "Web3-Onboard Demo",
    icon: '<svg>App Icon</svg>',
    description: "A demo of Web3-Onboard."
  }
})
function MyApp({ Component, pageProps }) {
  return (
    <Web3OnboardProvider web3Onboard={web3Onboard}>
      <Component {...pageProps} />
    </Web3OnboardProvider>
  )
}
export default MyApp

      

        import { useConnectWallet } from '@web3-onboard/react'

type UseConnectWallet = (): [
  { wallet: WalletState | null; connecting: boolean },
  (options: ConnectOptions) => Promise<void>,
  (wallet: DisconnectOptions) => Promise<void>,
  (addresses?: string[]) => Promise<void>,
  (wallets: WalletInit[]) => void,
  (wallet: WalletState, address?: string) => void
]

type ConnectOptions = {
  autoSelect?: string // wallet name to auto-select for user
}

type DisconnectOptions = {
  label: string  // wallet label
}

type WalletState = {
  label: string
  icon: string
  provider: EIP1193Provider
  accounts: Account[]
  chains: ConnectedChain[]
  instance?: unknown
}

type WalletInit = (helpers: WalletHelpers) => WalletModule | WalletModule[] | null;

const [
  {
    wallet, // the wallet that has been connected or null if not yet connected
    connecting // boolean indicating if connection is in progress
  },
  connect, // function to call to initiate user to connect wallet
  disconnect, // function to call with wallet<DisconnectOptions> to disconnect wallet
  updateBalances, // function to be called with an optional array of wallet addresses connected through Onboard to update balance or empty/no params to update all connected wallets
  setWalletModules, // function to be called with an array of wallet modules to conditionally allow connection of wallet types i.e. setWalletModules([ledger, trezor, injected])
  setPrimaryWallet // function that can set the primary wallet and/or primary account within that wallet. The wallet that is set needs to be passed in for the first parameter and if you would like to set the primary account, the address of that account also needs to be passed in
] = useConnectWallet()



      

        // set the second wallet in the wallets array as the primary
setPrimaryWallet(wallets[1])

// set the second wallet in the wallets array as the primary wallet
// as well as setting the third account in that wallet as the primary account
setPrimaryWallet(wallets[1], wallets[1].accounts[2].address)

      

        import { useSetChain } from '@web3-onboard/react'

type UseSetChain = (
  walletLabel?: string
): [
  {
    chains: Chain[]
    connectedChain: ConnectedChain | null
    settingChain: boolean
  },
  (options: SetChainOptions) => Promise<void>
]

type SetChainOptions = {
  chainId: string
  chainNamespace?: string
  wallet?: WalletState['label'],
  // if chain was instantiated without rpcUrl, include here. Used for network requests
  rpcUrl?: string, 
  // if chain was instantiated without token, include here. Used for display, eg Ethereum Mainnet
  label?: string,
  // if chain was instantiated without label, include here. The native token symbol, eg ETH, BNB, MATIC
  token?: string,
}

const [
  {
    chains, // the list of chains that web3-onboard was initialized with
    connectedChain, // the current chain the user's wallet is connected to
    settingChain // boolean indicating if the chain is in the process of being set
  },
  setChain // function to call to initiate user to switch chains in their wallet
] = useSetChain()

      

        type UseNotifications = (): [
  Notification[],
  (updatedNotification: CustomNotification) => {
    dismiss: () => void
    update: UpdateNotification
  },
  (update: Partial<Notify>) => void,
  (options: PreflightNotificationsOptions) => Promise<void | string>
]

type Notification = {
  id: string
  key: string
  type: NotificationType
  network: Network
  startTime?: number
  eventCode: string
  message: string
  autoDismiss: number
  link?: string
  onClick?: (event: Event) => void
}
type TransactionHandlerReturn =
  | CustomNotification
  | boolean
  | void
type CustomNotification = Partial<
  Omit<Notification, 'startTime' | 'network' | 'id' | 'key'>
>
type CustomNotificationUpdate = Partial<
  Omit<Notification, 'startTime' | 'network'>
>
type NotificationType = 'pending' | 'success' | 'error' | 'hint'
interface UpdateNotification {
  (notificationObject: CustomNotification): {
    dismiss: () => void
    update: UpdateNotification
  }
}
type Notify = {
  /**
   * Defines whether to subscribe to transaction events or not
   * default: true
   */
  enabled?: boolean
  /**
   * Callback that receives all transaction events
   * Return a custom notification based on the event
   * Or return false to disable notification for this event
   * Or return undefined for a default notification
   */
  transactionHandler: (
    event: EthereumTransactionData
  ) => TransactionHandlerReturn
  /**
   * Position of notifications that defaults to the same position as the
   * Account Center (if enabled) of the top right if AC is disabled
   * and notifications are enabled (enabled by default with API key)
   */
  position?: NotificationPosition
}

type PreflightNotificationsOptions = {
  sendTransaction?: () => Promise<string | void>
  estimateGas?: () => Promise<string>
  gasPrice?: () => Promise<string>
  balance?: string | number
  txDetails?: TxDetails
  txApproveReminderTimeout?: number
}
type TxDetails = {
  value: string | number
  to?: string
  from?: string
}

      

        import { useNotifications } from '@web3-onboard/react'

const [
  notifications, // the list of all notifications that update when notifications are added, updated or removed
  customNotification, // a function that takes a customNotification object and allows custom notifications to be shown to the user, returns an update and dismiss callback
  updateNotify, // a function that takes a Notify object to allow updating of the properties
  preflightNotifications // a function that takes a PreflightNotificationsOption to create preflight notifications
] = useNotifications()

// View notifications as they come in if you would like to handle them independent of the notification display
useEffect(() => {
  console.log(notifications)
}, [notifications])

const sendTransactionWithPreFlightNotifications = async () => {
  const balanceValue = Object.values(wallet.accounts[0].balance)[0]

  const signer = provider.getUncheckedSigner()

  const txDetails = {
    to: toAddress,
    value: 1000000000000000
  }

  const sendTransaction = () => {
    return signer.sendTransaction(txDetails).then(tx => tx.hash)
  }

  const gasPrice = () => provider.getGasPrice().then(res => res.toString())

  const estimateGas = () => {
    return provider.estimateGas(txDetails).then(res => res.toString())
  }

  const transactionHash =
    await preflightNotifications({
      sendTransaction,
      gasPrice,
      estimateGas,
      balance: balanceValue,
      txDetails: txDetails
    })
  console.log(transactionHash)
}

// Custom notification example
<button
  className="bn-demo-button"
  onClick={() => {
    const { update } =
      customNotification({
        eventCode: 'dbUpdate',
        type: 'hint',
        message: 'Custom hint notification created by the dapp',
        onClick: () =>
          window.open(`https://www.blocknative.com`)
      })
    // Update your notification example below
    setTimeout(
      () =>
        update({
          eventCode: 'dbUpdateSuccess',
          message: 'Hint notification reason resolved!',
          type: 'success',
          autoDismiss: 5000
        }),
      4000
    )
  }}
>
  Custom Hint Notification
</button>
<button
  className="bn-demo-button"
  onClick={async () => {
    sendTransactionWithPreFlightNotifications()
  }}
>
  Send with In Flight and Pre Flight Notifications
</button>

      

        import { useWallets } from '@web3-onboard/react'

type UseWallets = (): WalletState[]

const connectedWallets = useWallets()

      

        import { useAccountCenter } from '@web3-onboard/react'

type UseAccountCenter = (): ((
  update: AccountCenter | Partial<AccountCenter>
) => void)

type AccountCenterPosition =
  | 'topRight'
  | 'bottomRight'
  | 'bottomLeft'
  | 'topLeft'

type AccountCenter = {
  enabled: boolean
  position?: AccountCenterPosition
  expanded?: boolean
  minimal?: boolean
}

const updateAccountCenter = useAccountCenter()

      

        import { useSetLocale } from '@web3-onboard/react'

type useSetLocale = (): ((locale: string) => void)

const updateLocale = useSetLocale()

updateLocale('es')