Migrate to private class properties/methods

ts/context/Timers.ts

@@ -9,35 +9,34 @@ export type Timeout = {
 };
 
 export class Timers {
-  private counter = 0;
-
-  private readonly timers = new Map<number, NodeJS.Timeout>();
+  #counter = 0;
+  readonly #timers = new Map<number, NodeJS.Timeout>();
 
   public setTimeout(callback: () => void, delay: number): Timeout {
     let id: number;
     do {
-      id = this.counter;
+      id = this.#counter;
       // eslint-disable-next-line no-bitwise
-      this.counter = (this.counter + 1) >>> 0;
-    } while (this.timers.has(id));
+      this.#counter = (this.#counter + 1) >>> 0;
+    } while (this.#timers.has(id));
 
     const timer = setTimeout(() => {
-      this.timers.delete(id);
+      this.#timers.delete(id);
       callback();
     }, delay);
 
-    this.timers.set(id, timer);
+    this.#timers.set(id, timer);
 
     return { id } as unknown as Timeout;
   }
 
   public clearTimeout({ id }: Timeout): ReturnType<typeof clearTimeout> {
-    const timer = this.timers.get(id);
+    const timer = this.#timers.get(id);
     if (timer === undefined) {
       return;
     }
 
-    this.timers.delete(id);
+    this.#timers.delete(id);
     return clearTimeout(timer);
   }
 }