From e1936e33817e2413acadbb3db8e4e36df7e6e7a5 Mon Sep 17 00:00:00 2001
From: Tim <tim.reichen@gmail.com>
Date: Tue, 3 Sep 2024 13:41:55 +0200
Subject: [PATCH] initial commit

---
 yaml/_dumper_state.ts  | 12 ++++++------
 yaml/stringify_test.ts |  1 +
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/yaml/_dumper_state.ts b/yaml/_dumper_state.ts
index 615e39866404..cab813465e32 100644
--- a/yaml/_dumper_state.ts
+++ b/yaml/_dumper_state.ts
@@ -744,8 +744,12 @@ export class DumperState {
     if (block) {
       block = this.flowLevel < 0 || this.flowLevel > level;
     }
-
-    if (isObject(value)) {
+    if (typeof value === "string" || value instanceof String) {
+      value = value instanceof String ? value.valueOf() : value;
+      if (tag !== "?") {
+        value = this.stringifyScalar(value as string, { level, isKey });
+      }
+    } else if (isObject(value)) {
       const duplicateIndex = this.duplicates.indexOf(value);
       const duplicate = duplicateIndex !== -1;
 
@@ -789,10 +793,6 @@ export class DumperState {
           }
         }
       }
-    } else if (typeof value === "string") {
-      if (tag !== "?") {
-        value = this.stringifyScalar(value, { level, isKey });
-      }
     } else {
       if (this.skipInvalid) return null;
       throw new TypeError(`Cannot stringify ${typeof value}`);
diff --git a/yaml/stringify_test.ts b/yaml/stringify_test.ts
index 9aa35958be61..ed2efc963355 100644
--- a/yaml/stringify_test.ts
+++ b/yaml/stringify_test.ts
@@ -694,6 +694,7 @@ Oren: Ben-Kiki
 
 Deno.test("stringify() handles string", () => {
   assertEquals(stringify("Hello World"), "Hello World\n");
+  assertEquals(stringify(new String("Hello World")), "Hello World\n");
 });
 
 Deno.test("stringify() uses quotes around deprecated boolean notations when `compatMode: true`", () => {