How to use the brorand.Rand function in brorand

import * as brorand from 'brorand';

{
	let result: Buffer|Uint8Array = brorand(42);
}

{
	let Rand = new brorand.Rand({getByte: () => 255});
	let rand: {getByte: () => number} = Rand.rand;
	let result: Buffer|Uint8Array = Rand.generate(42);
}

function MillerRabin(rand) {
  this.rand = rand || new brorand.Rand();
}
module.exports = MillerRabin;

function KeyGen(options) {
  this.options = options || {};
  this.rand = new brorand.Rand(this.options.prng);
  this.primal = primal.create({ 'miller-rabin': this.rand });
}
module.exports = KeyGen;

/*
 * This is to patch stupid behavior by brorand
 * (https://github.com/indutny/brorand)
 * which is used underneath elliptic for generating keys.
 *
 * It seems to not believe that we're in nodejs when we really are
 */

import crypto from 'crypto';
import rand from 'brorand';

rand.Rand.prototype._rand = function _rand(n) {
  return crypto.randomBytes(n);
};

function MillerRabin(rand) {
  this.rand = rand || new brorand.Rand();
}
module.exports = MillerRabin;

function MillerRabin(rand) {
  this.rand = rand || new brorand.Rand();
}
module.exports = MillerRabin;