This is very bad. Don't do this. but hey... if no one's looking... ;-)

Uint8array.buffermethods.js

// Mimics Buffer.from(x, 'hex') logic
// Stops on first non-hex string and returns
// https://github.com/nodejs/node/blob/v14.18.1/src/string_bytes.cc#L246-L261
Uint8Array.fromHex = function (hexString) {
  const MAP_HEX = {0:0,1:1,2:2,3:3,4:4,5:5,6:6,7:7,8:8,9:9,a:10,b:11,c:12,d:13,e:14,f:15,A:10,B:11,C:12,D:13,E:14,F:15};
  const bytes = new this(Math.floor((hexString || "").length / 2));
  let finalLen = bytes.length;
  for (let i = 0; i < finalLen; i++) {
    const a = MAP_HEX[hexString[i * 2]];
    const b = MAP_HEX[hexString[i * 2 + 1]];
    if (a === undefined || b === undefined) {
      finalLen = i;
      break;
    }
    bytes[i] = (a << 4) | b;
  }
  return finalLen === bytes.length ? bytes : bytes.slice(0, finalLen);
};
Uint8Array.prototype.toHex = function () {
  const HEX_STRINGS = "0123456789abcdef";
  return Array.from(this)
    .map((b) => HEX_STRINGS[b >> 4] + HEX_STRINGS[b & 15])
    .join("");
};
Uint8Array.prototype.compare = function (v2) {
  const minLength = Math.min(this.length, v2.length);
  for (let i = 0; i < minLength; ++i) {
    if (this[i] !== v2[i]) {
      return this[i] < v2[i] ? -1 : 1;
    }
  }
  return this.length === v2.length ? 0 : this.length > v2.length ? 1 : -1;
};
Uint8Array.prototype.equals = function (v2) {
  return this.compare(v2) === 0;
};