diff --git a/packages/@sanity/portable-text-editor/test/tsconfig.json b/packages/@sanity/portable-text-editor/test/tsconfig.json
new file mode 100644
index 00000000000..07f6f01aaa5
--- /dev/null
+++ b/packages/@sanity/portable-text-editor/test/tsconfig.json
@@ -0,0 +1,6 @@
+{
+  "extends": "../tsconfig",
+  "compilerOptions": {
+    "isolatedModules": false,
+  }
+}