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) {