diff --git a/src/js/playground/compile/__kipper.d.ts b/src/js/playground/compile/__kipper.d.ts
new file mode 100644
index 000000000..4d21e5459
--- /dev/null
+++ b/src/js/playground/compile/__kipper.d.ts
@@ -0,0 +1,10 @@
+// Define global '__kipper' on the window (d.ts file)
+export {};
+
+declare global {
+  var __kipper: { [key: string]: any };
+
+  interface Window {
+    __kipper: { [key: string]: any };
+  }
+}
diff --git a/src/js/playground/compile/compile-worker.ts b/src/js/playground/compile/compile-worker.ts
index 9405c3557..88f1f824e 100644
--- a/src/js/playground/compile/compile-worker.ts
+++ b/src/js/playground/compile/compile-worker.ts
@@ -12,6 +12,10 @@ let compiler: never | any;
  * @param code The translated code to evaluate. (Must be in JavaScript)
  */
 async function evalKipperCode(code: string) {
+  // Clean up any global scope entries
+  // eslint-disable-next-line no-undef
+  window.__kipper = __kipper = undefined;
+
 	// Overwrite 'console.log'
 	const prevLog = console.log;
 	console.log = (msg: string) => {