From 2319edf022ed8cfd30bff136328859a3660ba9da Mon Sep 17 00:00:00 2001
From: Kuitos <kuitos.lau@gmail.com>
Date: Fri, 9 Oct 2020 19:52:40 +0800
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20copy=20function=20prototype=20if?=
 =?UTF-8?q?=20it=20had=20while=20we=20create=20a=20new=20function=20using?=
 =?UTF-8?q?=20bind=20(#977)?=
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---
 src/sandbox/common.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/sandbox/common.ts b/src/sandbox/common.ts
index af34633..e05700c 100644
--- a/src/sandbox/common.ts
+++ b/src/sandbox/common.ts
@@ -28,6 +28,8 @@ export function getTargetValue(target: any, value: any): any {
     const boundValue = value.bind(target);
     // some callable function has custom fields, we need to copy the enumerable props to boundValue. such as moment function.
     Object.keys(value).forEach(key => (boundValue[key] = value[key]));
+    // copy prototype, for performance reason, we use in operator to check rather than hasOwnProperty
+    if ('prototype' in value) boundValue.prototype = value.prototype;
     Object.defineProperty(value, boundValueSymbol, { enumerable: false, value: boundValue });
     return boundValue;
   }