How to use the @liquality/ethereum-rpc-provider function in @liquality/ethereum-rpc-provider

function createERC20Client (asset, wallet) {
  const assetConfig = config.assets[asset]
  const erc20Client = new Client()
  erc20Client.addProvider(new EthereumRpcProvider(
    assetConfig.rpc.url
  ))
  if (wallet === 'metamask') {
    erc20Client.addProvider(new EthereumMetaMaskProvider(web3.currentProvider, EthereumNetworks[assetConfig.network]))
  } else if (wallet === 'ethereum_ledger') {
    erc20Client.addProvider(new EthereumLedgerProvider({network: EthereumNetworks[assetConfig.network]}))
  }
  erc20Client.addProvider(new EthereumErc20Provider(assetConfig.contractAddress))
  erc20Client.addProvider(new EthereumErc20SwapProvider())
  return erc20Client
}

function createEthClient (asset, wallet) {
  const ethConfig = config.assets.eth
  const ethClient = new Client()
  ethClient.addProvider(new EthereumRpcProvider(
    ethConfig.rpc.url
  ))
  if (wallet === 'metamask') {
    ethClient.addProvider(new EthereumMetaMaskProvider(web3.currentProvider, EthereumNetworks[ethConfig.network]))
  } else if (wallet === 'ethereum_ledger') {
    ethClient.addProvider(new EthereumLedgerProvider({network: EthereumNetworks[ethConfig.network]}))
  }
  ethClient.addProvider(new EthereumSwapProvider())
  return ethClient
}