Memory Leak when using brpop

I've this piece of code which is causing memory leaks.

var redis = require("redis");
var util = require("util");

client = redis.createClient();

var brpopAsync = util.promisify(client.brpop).bind(client);

setInterval(() => {
  process.nextTick( async () => {
   const data = await brpopAsync('testlist', 5);
 }) 
}, 200);

I inspected the code using chrome debugger and saw that this indeed is a closure leak. However, if I replace the brpop with rpop I don't get any memory leak. I'm trying to understand what's the issue with using brpop. How can brpop be used efficiently.

Environment

• Node.js Version: v10.16.0

• Redis Version: 4.0.9

• Platform: Mac OSX, Amazon Linux

Start with the provided Node.js reproduction and compare the promisified brpop call with rpop under the same interval. Inspect the client's brpop handling and determine whether the reported closure and memory growth can be reproduced; done means explaining the cause and documenting an efficient usage pattern or a verified fix.