Error.getSelector

import { AbiError } from 'tevm'

const insufficientBalance = new AbiError({
  type: "error",
  name: "InsufficientBalance",
  inputs: [
    { type: "uint256", name: "balance" },
    { type: "uint256", name: "required" }
  ]
})

try {
  await contract.call()
} catch (error) {
  const errorSelector = error.data.slice(0, 10)
  if (errorSelector === insufficientBalance.getSelector()) {
    // Decode error parameters
    const params = insufficientBalance.decodeParams(error.data)
    console.log(`Balance: ${params[0]}, Required: ${params[1]}`)
  }
}