.

2021/18.js

@@ -21,13 +21,13 @@ class SnailfishNumber {
                 return true
             }
         }
-        
+
         if (this.right instanceof SnailfishNumber) {
             if (this.right.explode(depth + 1)) {
                 return true
             }
         }
-        
+
         if (!(this.left instanceof SnailfishNumber) && !(this.right instanceof SnailfishNumber) && depth >= 4) {
             let lastNode = this
             let node = this.parent
@@ -142,3 +142,7 @@ function day18(input, part2) {
         return pairs.map((e) => e[0].add(e[1]).magnitude()).max()
     }
 }
+
+if (typeof window == "undefined") {
+    module.exports = day18
+}