ethereum_switch_network.ts

declare const window: any

const chainIds: {
  [chainId: string]: string
} = {
  ethereum: '0x1',
  bsc: '0x38',
}

const rpcUrls: {
  [chainId: string]: string
} = {
  ethereum: 'https://mainnet.infura.io/ocCdekUYwOyLn7h7OlJM',
  bsc: 'https://bsc-dataseed.binance.org',
}

/**
 * by default it switches to Ethereum. Update parameters for bsc or add more chainIds and rpcUrls for other networks.
 * chainid has to be a hex string
 */

// Tries to switch network first then if network is not added, it tries to add network
export const switchNetwork = async (
  hexChainId = chainIds.ethereum,
  rpcUrl = rpcUrls.ethereum
) => {
  const { ethereum } = window
  if (!ethereum) return
  try {
    await window?.ethereum?.request({
      method: 'wallet_switchEthereumChain',
      params: [{ chainId: hexChainId }],
    })
  } catch (error) {
    if ((error as any).code !== 4902) return
    try {
      await window.ethereum.request({
        method: 'wallet_addEthereumChain',
        params: [
          {
            chainId: hexChainId,
            rpcUrl,
          },
        ],
      })
    } catch (error) {
      console.error(error)
    }
  }
}