From c1a016ca9fbc537c516577767edd0c80202755f5 Mon Sep 17 00:00:00 2001
From: ayntee <ayyantee@gmail.com>
Date: Tue, 23 Mar 2021 14:31:29 +0400
Subject: [PATCH] fix(util/collection): .first(), .last(), .random() may return
 undefined (#680)

* fix(util/collection): .first() may return undefined

* fix(util/collection): .random(), .last() may return undefined
---
 src/util/collection.ts | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/util/collection.ts b/src/util/collection.ts
index 01489432e..78140bf0f 100644
--- a/src/util/collection.ts
+++ b/src/util/collection.ts
@@ -16,16 +16,17 @@ export class Collection<K, V> extends Map<K, V> {
     return [...this.values()];
   }
 
-  first(): V {
+  /** Retrieve the value of the first element in this collection */
+  first(): V | undefined {
     return this.values().next().value;
   }
 
-  last(): V {
+  last(): V | undefined {
     return [...this.values()][this.size - 1];
   }
 
-  random() {
-    return chooseRandom([...this.values()]);
+  random(): V | undefined {
+    return chooseRandom<V>([...this.values()]);
   }
 
   find(callback: (value: V, key: K) => boolean) {