This is an example of how to resolve base names using ethers.js

ethers-basename.js

import { Contract, utils } from 'ethers'
import { getProvider } from './contracts' // https://docs.ethers.org/v5/api/providers/
import L2ResolverAbi from './L2ResolverAbi.json' // https://gist.github.com/hughescoin/adf1c90b67cd9b2b913b984a2cc98de9
const BASENAME_L2_RESOLVER_ADDRESS = '0xC6d566A56A1aFf6508b41f6c90ff131615583BCD'

const convertChainIdToCoinType = (chainId) => {
  // L1 resolvers to addr
  if (chainId === 1) { // 1 is mainnet chain id
    return 'addr'
  }
  const cointype = (0x80000000 | chainId) >>> 0
  return cointype.toString(16).toLocaleUpperCase()
}
const convertReverseNodeToBytes = (address, chainId) => {
  const addressFormatted = address.toLowerCase()
  const addressNode = utils.solidityKeccak256(['string'], [addressFormatted.substring(2)]) // NOTE: hash it as a string not address
  const chainCoinType = convertChainIdToCoinType(chainId)
  const baseReverseNode = utils.namehash(`${chainCoinType.toLocaleUpperCase()}.reverse`)
  const addressReverseNode = utils.solidityKeccak256(
    ['bytes32', 'bytes32'],
    [baseReverseNode, addressNode]
  )
  return addressReverseNode
}

export const getBaseName = async (address) => {
  try {
    const addressReverseNode = convertReverseNodeToBytes(address, 8453) // 8453 is base chain id
    const baseProvider = await getProvider()
    const contract = new Contract(BASENAME_L2_RESOLVER_ADDRESS, L2ResolverAbi, baseProvider)
    const basename = await contract.name(addressReverseNode)
    return basename
  } catch (e) {
    console.error('Error getting basename', e)
  }
}

Kh.f