Private field holding new EventEmitter() from require("events") is unreadable when its class is constructed as a parent (next redis createClient blocker) #11131

Summary

A class constructor assigns new EventEmitter(), obtained through require("events"), to a #private field. When that class is constructed as the parent of a subclass, the field can't be read afterwards:

TypeError: Cannot access private member from an object whose class did not declare it

With import { EventEmitter } from "node:events" it works.

This is the next blocker for redis@6.1.0 createClient({ socket }), once #11120 (PR #11129) and #11042 (PR #11122) are applied. In @redis/client, RedisClient sets this.#socket to a RedisSocket extends EventEmitter (CommonJS require("node:events")) and is constructed through attachConfig's class extends BaseClass {}. client.connect() then fails at this._self.#socket.connect().

Repro (no packages)

const EventEmitter = require("events");
class Client {
  #socket: any;
  constructor() { this.#socket = new EventEmitter(); }
  kind() { return typeof this.#socket; }
}
class Sub extends Client {}
try { console.log("private", new Sub().kind()); } catch (e) { console.log("private threw", (e as Error).message); }

• Node 26.5.1: private object
• Perry origin/main 784ed8e (perry-dev build): private threw Cannot access private member from an object whose class did not declare it

Observations

• It only fails when the class is constructed as a parent. new Client().kind() works. It fails for new Sub() and for a dynamic new (Sub as any)().
• The import { EventEmitter } from "node:events" form prints private object.
• With const { EventEmitter } = require("events"), new EventEmitter() created in that constructor has .constructor !== EventEmitter (constructor.name is undefined), even when Client is constructed directly. .on is still a function.
• A user class in place of EventEmitter works.

redis end-to-end status (for the record)

Fixture: redis 6.1.0 exact, compilePackages = redis, @redis/{client,bloom,json,search,time-series}, cluster-key-slot. Tested against a live redis-server. Node prints the full set/get/hSet/incr sequence. Perry on #11129 + #11122 gets through createClient({ socket }) and client.on("error", ...), then throws the error above from client.connect(). The same connect() failure reproduces in a small compiled-package fixture mirroring RedisSocket/RedisClient/attachConfig, and it is gone when RedisSocket does not extend EventEmitter.