From c8db224efed08d7722c9951cde048d731db050d3 Mon Sep 17 00:00:00 2001
From: "Kevin (Kun) \"Kassimo\" Qian" <kevinkassimo@gmail.com>
Date: Fri, 19 Apr 2019 17:39:54 -0700
Subject: Make Deno/Deno.core not deletable/writable (#2153)

---
 js/util.ts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'js/util.ts')

diff --git a/js/util.ts b/js/util.ts
index b81b96aca..348e36a1f 100644
--- a/js/util.ts
+++ b/js/util.ts
@@ -131,6 +131,21 @@ export function requiredArguments(
   }
 }
 
+// @internal
+export function immutableDefine(
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  o: any,
+  p: string | number | symbol,
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  value: any
+): void {
+  Object.defineProperty(o, p, {
+    value,
+    configurable: false,
+    writable: false
+  });
+}
+
 // Returns values from a WeakMap to emulate private properties in JavaScript
 export function getPrivateValue<
   K extends object,
-- 
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