Migrate to private class properties/methods

ts/util/AsyncQueue.ts

@@ -16,32 +16,30 @@ import { once, noop } from 'lodash';
  * See the tests to see how this works.
  */
 export class AsyncQueue<T> implements AsyncIterable<T> {
-  private onAdd: () => void = noop;
-
-  private queue: Array<T> = [];
-
-  private isReading = false;
+  #onAdd: () => void = noop;
+  #queue: Array<T> = [];
+  #isReading = false;
 
   add(value: Readonly<T>): void {
-    this.queue.push(value);
-    this.onAdd();
+    this.#queue.push(value);
+    this.#onAdd();
   }
 
   async *[Symbol.asyncIterator](): AsyncIterator<T> {
-    if (this.isReading) {
+    if (this.#isReading) {
       throw new Error('Cannot iterate over a queue more than once');
     }
-    this.isReading = true;
+    this.#isReading = true;
 
     while (true) {
-      yield* this.queue;
+      yield* this.#queue;
 
-      this.queue = [];
+      this.#queue = [];
 
       // We want to iterate over the queue in series.
       // eslint-disable-next-line no-await-in-loop
       await new Promise<void>(resolve => {
-        this.onAdd = once(resolve);
+        this.#onAdd = once(resolve);
       });
     }
   }