Using a custom AbiCoder within an Interface

[bohendo]

I'm updating my code to use CAIP-10 multi-chain addresses so eg I'm using evm:1:0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 as the WETH address, etc.

I'd like to update my event parser so that whenever I get an address from tx logs, this address gets a prefix according to the network it came from.

My current(ly broken) attempt:

export const parseEvent = (
  abi: string[], // human readable abi
  evmLog: EvmTransactionLog, // a (slightly simplified) tx receipt log entry
  evmMeta: EvmMetadata, // id prop (aka chainId) is the only one that matters here
): { name: string; args: { [key: string]: string }; } => {

  // prefix + checksum address (fn is unused bc idk how to use it yet)
  const formatAddress = (address: string): string => `evm:${evmMeta.id}:${getAddress(address)}`;

  /* idk how to use this abi coder either & idk if this is how it should even be implemented
  const coder = new AbiCoder((type: string, value: any) => {
    if (type === "address") {
      return formatAddress(value);
    } else {
      return value;
    }
  });
  */

  // can I provide a custom coder to this interface? 
  const iface = abi.length ? new Interface(abi) : abi as Interface;

  // This works nicely.. but feels like something that maybe the interface should do for me..?
  const name = Object.values(iface.events).find(e =>
    iface.getEventTopic(e) === evmLog.topics[0]
  )?.name;

  // Mapping args to convert some staddresses manually breaks stuff bc args is not a normal array
  // I could potentially map + manually set everything from Object.keys() 
  const args = name ? iface.parseLog({
    data: evmLog.data,
    topics: evmLog.topics,
  }).args/*.map(arg => arg.length === 42 ? formatAddress(arg) : arg)*/ : [];

  return { name, args };
};

[ricmoo]

In v6, there is a method that returns the AbiCoder, which can be overridden. I have not spent much time on testing the full capability of using it, but it isn't really a priority. But if you have success with it, please share it here for others to appreciate. :)