From 60bc9172f1e848a02d4fbad6266f79f7183dc67f Mon Sep 17 00:00:00 2001
From: furao <furao@puchigames.com>
Date: Sat, 13 Jun 2026 14:06:00 +0800
Subject: [PATCH] =?UTF-8?q?[cli]=20=E4=BF=AE=E5=A4=8D:=20dry-run=20diff=20?=
 =?UTF-8?q?=E6=95=B0=E7=BB=84=E9=95=BF=E5=BA=A6=E5=8F=98=E5=8C=96=E8=AF=AF?=
 =?UTF-8?q?=E6=8A=A5=E4=B8=BA=20index=20=E5=A4=84=E7=BD=AE=20null?=
MIME-Version: 1.0
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---
 cli/src/editor/diff.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/cli/src/editor/diff.js b/cli/src/editor/diff.js
index 4d6f177..9c3c8f2 100644
--- a/cli/src/editor/diff.js
+++ b/cli/src/editor/diff.js
@@ -39,6 +39,13 @@ function diffObject(a, b, prefix, out) {
     out[prefix || '<root>'] = [a, b];
     return;
   }
+  // 数组长度不同：整数组替换。按 index 递归会把"数组截断/扩展"误报成
+  // "该位置变 undefined"，JSON 序列化时 undefined → null，看上去像被置空了
+  // 一个 null 槽位（例：[x] → [] 误报成 ".0: [x, null]"）。
+  if (Array.isArray(a) && Array.isArray(b) && a.length !== b.length) {
+    out[prefix || '<root>'] = [a, b];
+    return;
+  }
   const keys = new Set([...Object.keys(a), ...Object.keys(b)]);
   for (const k of keys) {
     const av = a[k];