component events

library/internal/limited-collection.ts

@@ -0,0 +1,24 @@
+export class LimitedCollection<T> {
+  private items: T[] = []
+
+  constructor(private readonly size: number) {}
+
+  add(item: T) {
+    if (this.items.length >= this.size) {
+      this.items.shift()
+    }
+    this.items.push(item)
+  }
+
+  has(item: T) {
+    return this.items.includes(item)
+  }
+
+  values(): readonly T[] {
+    return this.items
+  }
+
+  [Symbol.iterator]() {
+    return this.items[Symbol.iterator]()
+  }
+}