From c2a7590666d6e03789a07ac132540f584a08ea47 Mon Sep 17 00:00:00 2001
From: Kuitos <kuitos.lau@gmail.com>
Date: Tue, 25 May 2021 17:49:26 +0800
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20should=20not=20change=20currentS?=
 =?UTF-8?q?cript=20if=20it=20not=20configurable=20(#1470)?=
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---
 src/sandbox/patchers/dynamicAppend/common.ts | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/sandbox/patchers/dynamicAppend/common.ts b/src/sandbox/patchers/dynamicAppend/common.ts
index 42c117d..969b76b 100644
--- a/src/sandbox/patchers/dynamicAppend/common.ts
+++ b/src/sandbox/patchers/dynamicAppend/common.ts
@@ -219,12 +219,18 @@ function getOverwrittenAppendChildOrInsertBefore(opts: {
               fetch,
               strictGlobal,
               beforeExec: () => {
-                Object.defineProperty(document, 'currentScript', {
-                  get(): any {
-                    return element;
-                  },
-                  configurable: true,
-                });
+                const isCurrentScriptConfigurable = () => {
+                  const descriptor = Object.getOwnPropertyDescriptor(document, 'currentScript');
+                  return !descriptor || descriptor.configurable;
+                };
+                if (isCurrentScriptConfigurable()) {
+                  Object.defineProperty(document, 'currentScript', {
+                    get(): any {
+                      return element;
+                    },
+                    configurable: true,
+                  });
+                }
               },
               success: () => {
                 manualInvokeElementOnLoad(element);