Nats microservice memory leak

[vbrvk]

Bug Report

Current behaviour

So, I have detected memory leak in my nats nest service

After some research I found, that problem is not in my code.
Actually the problem is in https://github.com/nestjs/nest/blob/master/packages/microservices/server/server.ts#L173

try {
	validPattern = JSON.parse(pattern);
} catch (error) {
	// Uses a fundamental object (`pattern` variable without any conversion)
	validPattern = pattern;
}

As pattern in NATS always string, then every request code is failing to parse pattern and it leads to a memory leak
I don't know why this construction is leaking, but it is. I found the same issue on the StackOverflow https://stackoverflow.com/questions/48309464/node-js-try-catch-memory-leak

Reproduction in CodeSandbox: https://codesandbox.io/s/restless-leaf-gtyn1?file=/src/index.js

Environment

Nest version: 7.2.0
 
For Tooling issues:
- Node version: v12.6.0, v8.15.0
- Platform:  Mac, Linux

[vbrvk]

Also created bug in repo Node.js nodejs/node#35228

[vbrvk]

Closing issue due nodejs/node#35048