Mark class prototype as read-only

babel · Dec 10, 2021 · 5e412a6 · 5e412a6
1 parent a5e8b8b
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diff --git a/packages/babel-helpers/src/helpers.ts b/packages/babel-helpers/src/helpers.ts
@@ -223,6 +223,7 @@ helpers.createClass = helper("7.0.0-beta.0")`
   export default function _createClass(Constructor, protoProps, staticProps) {
     if (protoProps) _defineProperties(Constructor.prototype, protoProps);
     if (staticProps) _defineProperties(Constructor, staticProps);
+    Object.defineProperty(Constructor, "prototype", {});
     return Constructor;
   }
 `;

diff --git a/packages/babel-plugin-transform-classes/test/fixtures/exec/prototype-descriptor.js b/packages/babel-plugin-transform-classes/test/fixtures/exec/prototype-descriptor.js
@@ -0,0 +1,16 @@
+class A {}
+class B extends A {}
+
+expect(Object.getOwnPropertyDescriptor(A, "prototype")).toEqual({
+  value: A.prototype,
+  configurable: false,
+  enumerable: false,
+  writable: false,
+});
+
+expect(Object.getOwnPropertyDescriptor(B, "prototype")).toEqual({
+  value: A.prototype,
+  configurable: false,
+  enumerable: false,
+  writable: false,
+});