fix: Issue with converting empty data to array (#75)

* fix: Issue with converting empty data to array

* test: add case

* chore: bump version

---------

Co-authored-by: huang yao <5945154+kirakiray@users.noreply.github.com>

Author: kirakiray

dist/stanz.js

@@ -1,4 +1,4 @@
-//! stanz - v8.2.2 https://github.com/ofajs/stanz  (c) 2018-2025 YAO
+//! stanz - v8.2.3 https://github.com/ofajs/stanz  (c) 2018-2025 YAO
 (function (global, factory) {
   typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
   typeof define === 'function' && define.amd ? define(['exports'], factory) :
@@ -771,6 +771,9 @@
       _revoke: {
         value: revoke,
       },
+      __init_is_array: {
+        value: Array.isArray(data),
+      },
     });
 
     Object.keys(data).forEach((key) => {
@@ -836,6 +839,8 @@
       let isPureArray = true;
       let maxId = -1;
 
+      const initIsArray = this.__init_is_array;
+
       Object.keys(this).forEach((k) => {
         let val = this[k];
 
@@ -858,8 +863,12 @@
       if (isPureArray) {
         obj.length = maxId + 1;
         obj = Array.from(obj);
-      }
 
+        if (!obj.length && !initIsArray) {
+          // 初始化不是数组，就是对象
+          obj = {};
+        }
+      }
       const xid = this.xid;
       defineProperties(obj, {
         xid: {

dist/stanz.min.js

@@ -1,4 +1,4 @@
-//! stanz - v8.2.2 https://github.com/ofajs/stanz  (c) 2018-2025 YAO
+//! stanz - v8.2.3 https://github.com/ofajs/stanz  (c) 2018-2025 YAO
 // const error_origin = "http://127.0.0.1:5793/errors";
 const error_origin = "https://ofajs.github.io/ofa-errors/errors";
 
@@ -765,6 +765,9 @@ function constructor(data, handler$1 = handler) {
     _revoke: {
       value: revoke,
     },
+    __init_is_array: {
+      value: Array.isArray(data),
+    },
   });
 
   Object.keys(data).forEach((key) => {
@@ -830,6 +833,8 @@ class Stanz extends Array {
     let isPureArray = true;
     let maxId = -1;
 
+    const initIsArray = this.__init_is_array;
+
     Object.keys(this).forEach((k) => {
       let val = this[k];
 
@@ -852,8 +857,12 @@ class Stanz extends Array {
     if (isPureArray) {
       obj.length = maxId + 1;
       obj = Array.from(obj);
-    }
 
+      if (!obj.length && !initIsArray) {
+        // 初始化不是数组，就是对象
+        obj = {};
+      }
+    }
     const xid = this.xid;
     defineProperties(obj, {
       xid: {

dist/stanz.min.js.map

@@ -1,6 +1,6 @@
 {
   "name": "stanz",
-  "version": "8.2.2",
+  "version": "8.2.3",
   "description": "javascript library for listening to data changes of child objects",
   "main": "dist/stanz.js",
   "exports": {

dist/stanz.min.mjs

@@ -54,6 +54,9 @@ export function constructor(data, handler = stanzHandler) {
     _revoke: {
       value: revoke,
     },
+    __init_is_array: {
+      value: Array.isArray(data),
+    },
   });
 
   Object.keys(data).forEach((key) => {
@@ -119,6 +122,8 @@ export default class Stanz extends Array {
     let isPureArray = true;
     let maxId = -1;
 
+    const initIsArray = this.__init_is_array;
+
     Object.keys(this).forEach((k) => {
       let val = this[k];
 
@@ -141,8 +146,12 @@ export default class Stanz extends Array {
     if (isPureArray) {
       obj.length = maxId + 1;
       obj = Array.from(obj);
-    }
 
+      if (!obj.length && !initIsArray) {
+        // 初始化不是数组，就是对象
+        obj = {};
+      }
+    }
     const xid = this.xid;
     defineProperties(obj, {
       xid: {

dist/stanz.min.mjs.map

@@ -57,3 +57,15 @@ describe("Test the methods owned by the Stanz instance", () => {
     expect(d.a).toBe(201);
   });
 });
+
+test("to JSON empty object", () => {
+  const d = stanz({
+    obj: {
+      o1: {},
+      o2: [],
+    },
+  });
+
+  expect(d.obj.o1.toJSON()).toEqual({});
+  expect(d.obj.o2.toJSON()).toEqual([]);
+});