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import type { HexString } from 'https://deno.land/x/polkadot@0.2.40/util/types.ts';
import { isHex } from 'https://deno.land/x/polkadot@0.2.40/util/mod.ts';
import { isEthereumChecksum } from './isChecksum.ts';
export function isEthereumAddress (address?: HexString | string): boolean {  if (!address || address.length !== 42 || !isHex(address)) {    return false;  } else if (/^(0x)?[0-9a-f]{40}$/.test(address) || /^(0x)?[0-9A-F]{40}$/.test(address)) {    return true;  }
  return isEthereumChecksum(address);}