[bun.js] Fix missing `.prototype` on builtins

1 files changed, 38 insertions, 0 deletions

diff --git a/integration/bunjs-only-snippets/globals.test.js b/integration/bunjs-only-snippets/globals.test.js
new file mode 100644
index 000000000..831bbd93f
--- /dev/null
+++ b/integration/bunjs-only-snippets/globals.test.js
@@ -0,0 +1,38 @@
+import { it, describe, expect } from "bun:test";
+
+it("extendable", () => {
+  const classes = [
+    Blob,
+    TextDecoder,
+    TextEncoder,
+    Request,
+    Response,
+    Headers,
+    HTMLRewriter,
+    Bun.Transpiler,
+  ];
+  // None of these should error
+  for (let Class of classes) {
+    var Foo = class extends Class {};
+    var bar = new Foo();
+    expect(bar instanceof Class).toBe(true);
+    expect(Class.prototype instanceof Class).toBe(true);
+  }
+  expect(true).toBe(true);
+});
+
+it("name", () => {
+  const classes = [
+    ["Blob", Blob],
+    ["TextDecoder", TextDecoder],
+    ["TextEncoder", TextEncoder],
+    ["Request", Request],
+    ["Response", Response],
+    ["Headers", Headers],
+    ["HTMLRewriter", HTMLRewriter],
+    ["Transpiler", Bun.Transpiler],
+  ];
+  for (let [name, Class] of classes) {
+    expect(Class.name).toBe(name);
+  }
+});