chore(NODE-6498): remove dead code in Topology (#4310)

Author: baileympearson

src/index.ts

@@ -561,7 +561,7 @@ export type {
   ReadPreferenceOptions
 } from './read_preference';
 export type { AsyncDisposable } from './resource_management';
-export type { ClusterTime, TimerQueue } from './sdam/common';
+export type { ClusterTime } from './sdam/common';
 export type {
   Monitor,
   MonitorEvents,

src/sdam/common.ts

@@ -1,5 +1,3 @@
-import { clearTimeout } from 'timers';
-
 import type { Binary, Long, Timestamp } from '../bson';
 import type { ClientSession } from '../sessions';
 import type { Topology } from './topology';
@@ -46,15 +44,6 @@ export const ServerType = Object.freeze({
 /** @public */
 export type ServerType = (typeof ServerType)[keyof typeof ServerType];
 
-/** @internal */
-export type TimerQueue = Set<NodeJS.Timeout>;
-
-/** @internal */
-export function drainTimerQueue(queue: TimerQueue): void {
-  queue.forEach(clearTimeout);
-  queue.clear();
-}
-
 /**
  * @public
  * Gossiped in component for the cluster time tracking the state of user databases

src/sdam/topology.ts

@@ -50,13 +50,11 @@ import {
 import {
   _advanceClusterTime,
   type ClusterTime,
-  drainTimerQueue,
   ServerType,
   STATE_CLOSED,
   STATE_CLOSING,
   STATE_CONNECTED,
   STATE_CONNECTING,
-  type TimerQueue,
   TopologyType
 } from './common';
 import {
@@ -132,8 +130,6 @@ export interface TopologyPrivate {
   servers: Map<string, Server>;
   credentials?: MongoCredentials;
   clusterTime?: ClusterTime;
-  /** timers created for the initial connect to a server */
-  connectionTimers: TimerQueue;
 
   /** related to srv polling */
   srvPoller?: SrvPoller;
@@ -325,8 +321,6 @@ export class Topology extends TypedEventEmitter<TopologyEvents> {
       credentials: options?.credentials,
       clusterTime: undefined,
 
-      // timer management
-      connectionTimers: new Set<NodeJS.Timeout>(),
       detectShardedTopology: ev => this.detectShardedTopology(ev),
       detectSrvRecords: ev => this.detectSrvRecords(ev)
     };
@@ -415,8 +409,6 @@ export class Topology extends TypedEventEmitter<TopologyEvents> {
     } finally {
       this.connectionLock = undefined;
     }
-
-    return this;
   }
 
   private async _connect(options?: ConnectOptions): Promise<Topology> {
@@ -515,7 +507,6 @@ export class Topology extends TypedEventEmitter<TopologyEvents> {
     stateTransition(this, STATE_CLOSING);
 
     drainWaitQueue(this[kWaitQueue], new MongoTopologyClosedError());
-    drainTimerQueue(this.s.connectionTimers);
 
     if (this.s.srvPoller) {
       this.s.srvPoller.stop();