const customNodeOptions = {

  rpcUrl: 'https://mainnet.optimism.io',

  chainId: 10,

}

// Setting network to Optimism

const magic = new Magic('YOUR_PUBLISHABLE_API_KEY', { network: customNodeOptions });

const customNodeOptions = {

  rpcUrl: 'https://goerli.optimism.io',

  chainId: 420

}

// Setting network to Optimism

const magic = new Magic('YOUR_PUBLISHABLE_API_KEY', { network: customNodeOptions });