Migrate to private class properties/methods

ts/util/LatestQueue.ts

@@ -20,15 +20,13 @@
 import { drop } from './drop';
 
 export class LatestQueue {
-  private isRunning: boolean;
-
-  private queuedTask?: () => Promise<void>;
-
-  private onceEmptyCallbacks: Array<() => unknown>;
+  #isRunning: boolean;
+  #queuedTask?: () => Promise<void>;
+  #onceEmptyCallbacks: Array<() => unknown>;
 
   constructor() {
-    this.isRunning = false;
-    this.onceEmptyCallbacks = [];
+    this.#isRunning = false;
+    this.#onceEmptyCallbacks = [];
   }
 
   /**
@@ -39,25 +37,25 @@ export class LatestQueue {
    *    tasks will be enqueued at a time.
    */
   add(task: () => Promise<void>): void {
-    if (this.isRunning) {
-      this.queuedTask = task;
+    if (this.#isRunning) {
+      this.#queuedTask = task;
     } else {
-      this.isRunning = true;
+      this.#isRunning = true;
       drop(
         task().finally(() => {
-          this.isRunning = false;
+          this.#isRunning = false;
 
-          const { queuedTask } = this;
+          const queuedTask = this.#queuedTask;
           if (queuedTask) {
-            this.queuedTask = undefined;
+            this.#queuedTask = undefined;
             this.add(queuedTask);
           } else {
             try {
-              this.onceEmptyCallbacks.forEach(callback => {
+              this.#onceEmptyCallbacks.forEach(callback => {
                 callback();
               });
             } finally {
-              this.onceEmptyCallbacks = [];
+              this.#onceEmptyCallbacks = [];
             }
           }
         })
@@ -69,6 +67,6 @@ export class LatestQueue {
    * Adds a callback to be called the first time the queue goes from "running" to "empty".
    */
   onceEmpty(callback: () => unknown): void {
-    this.onceEmptyCallbacks.push(callback);
+    this.#onceEmptyCallbacks.push(callback);
   }
 }