what is the WordArray object and how does it convert to Uint8Array? for migrating to the WebCrypto API?

[tx0c]

I'm getting a piece of legacy code which was using this crypto-js but new project is using all WebCrypto API,

> CryptoJS.algo.HMAC.create( CryptoJS.algo.SHA256, CryptoJS.enc.Base64.parse(secret) )
    .update(`GET\n/api/v0/ipns\nlimit=1000&ts=1693416815`)
    .finalize()
    .toString(CryptoJS.enc.Base64)
'orkI7k9LisIpA5mwlhqVVlTZg3tf3zthnMZ3HcUABBQ='

this can make correct expected signature code as above,

to convert this HMAC_SHA256 to WebCrypto API, I found this code snippet, I am passing the secret as a string but can't make exact same output, so I see the difference is here crypto-js is converting secret input with CryptoJS.enc.Base64.parse(secret) which gets a WordArray,

Not sure how does this WordArray map to a Uint8Array expected by WebCrypto API?

https://stackoverflow.com/a/67744336

(async ()=>{
'use strict';

let secret = "xxx"; // the secret key
let enc = new TextEncoder("utf-8");
let body = "GET\n/api/v0/ipns\nlimit=1000&ts=1693416815";
let algorithm = { name: "HMAC", hash: "SHA-256" };

let key = await crypto.subtle.importKey("raw", enc.encode(secret), algorithm, false, ["sign", "verify"]);
let signature = await crypto.subtle.sign(algorithm.name, key, enc.encode(body));
let digest = btoa(String.fromCharCode(...new Uint8Array(signature)));

console.log(digest);

})();

Thanks,