EVM (Ethereum / L2s)

yarn add ethers

npm install ethers

import ethers from 'ethers'
import getBridgeConfigs from './getBridgeConfigs'
import erc20Abi from './erc20Abi'
import bridgeAbi from './bridgeAbi'

export const callEvmBridgeContract = async ({
  address,
  amount,
  chain,
  token,
  commitmentId,
}) => {
  // See API Integration -> Fetch Bridge Configs for the full implementation
  const configs = await getBridgeConfigs()
  const chainConfig = configs[chain]

  // Replace with your wallet implementation
  const wallet = new ethers.Wallet(EVM_PRIVATE_KEY, new ethers.JsonRpcProvider(chainConfig.rpc))

  const tokenConfig = chainConfig.tokens[token]
  const tokenAmount = +amount * 10 ** tokenConfig.decimals
  const tokenAddress = tokenConfig.address

  const bridgeContractAddress = chainConfig.contractAddress

  const isNativeToken = chainConfig.nativeTokenName === token

  const bridgeContract = new ethers.Contract(bridgeContractAddress, bridgeAbi, wallet)

  // For ERC20 tokens we call 'depositWithId' and for native tokens we call 'depositNativeWithId'
  if (!isNativeToken) {
    // make sure to check token allowance first for erc20 tokens
    const erc20Contract = new ethers.Contract(tokenAddress, erc20Abi, wallet)
    const contractAllowance = await erc20Contract.allowance(address, bridgeContractAddress)
    const allowance = parseFloat(contractAllowance.toString()) / 10 ** tokenConfig.decimals

    if (allowance === 0 || allowance < parseFloat(amount)) {
     const tx = await erc20Contract.approve(bridgeContractAddress, tokenAmount)
     await tx.wait()
    }
    // Call the contract
    const tx = await bridgeContract.depositWithId(tokenAddress, tokenAmount, BigInt(`0x${commitmentId}`))
    return tx.wait()
  }

  const tx = await bridgeContract.depositNativeWithId(BigInt(`0x${commitmentId}`), {
    value: parseUnits(amount, 'ether'),
  })
  return tx.wait()
}