From c03204a8aa4f28fd90bccdf2f132714a4e10508f Mon Sep 17 00:00:00 2001
From: Shen Yiming <soimy@163.com>
Date: Tue, 3 Dec 2019 16:42:02 +0800
Subject: [PATCH] fix: Fix prune index not working on id=0

object.id should be object.hasOwnProperty("id") to determin it's existence
---
 src/atlasify.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/atlasify.ts b/src/atlasify.ts
index be46fc7..a2c6679 100644
--- a/src/atlasify.ts
+++ b/src/atlasify.ts
@@ -561,11 +561,11 @@ export class Atlasify {
     private pruneTagIndex (tagCount: { [index: string]: number; }) {
         for (let a of this._atlas) {
             const tag = a.tag ? a.tag : "_";
-            if (tagCount[tag] < 1 && a.id) delete a.id;
+            if (tagCount[tag] < 1 && a.hasOwnProperty("id")) delete a.id;
         }
         for (let s of this._spritesheets) {
             const tag = s.tag ? s.tag : "_";
-            if (tagCount[tag] < 1 && s.id) delete s.id;
+            if (tagCount[tag] < 1 && s.hasOwnProperty("id")) delete s.id;
         }
     }
 }