ethers.utils.keccak256(eventSig) in v4

[emclab]

The code below is from v4 I believe and it causes error in v5.3.

    const eventSig = `${event.name}(${types.toString()})`;
    console.log("eventSig : ", eventSig); //<<==  Transfer(address,address,uint256)
    // getting the topic
    const eventTopic = ethers.utils.keccak256(eventSig); //<<==error. What is it in v5.3?

The error is

(node:12180) UnhandledPromiseRejectionWarning: Error: invalid arrayify value (argument="value", value="Transfer(address,address,uint256)", code=INVALID_ARGUMENT, version=bytes/5.3.0)
    at Logger.makeError (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\logger\lib\index.js:187:21)
    at Logger.throwError (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\logger\lib\index.js:196:20)
    at Logger.throwArgumentError (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\logger\lib\index.js:199:21)

[zemse]

You can change it to:

const eventTopic = ethers.utils.id(eventSig);
// or
const eventTopic = ethers.utils.keccak256(ethers.utils.toUtf8Bytes(eventSig));