Constructing a WorkerEntrypoint from userland

src/workerd/api/tests/js-rpc-test.js

@@ -1731,3 +1731,19 @@ export let proxiedRpcTarget = {
     }
   },
 };
+
+// Test that we can construct a WorkerEntrypoint
+export class MyEntrypoint extends WorkerEntrypoint {
+  rpcFunc() {
+    return 'hello from entrypoint';
+  }
+}
+function constructEntrypoint(cls, env) {
+  return new cls({ waitUntil: () => {} }, env);
+}
+export let testConstructEntrypoint = {
+  async test(controller, env, ctx) {
+    const constructed = constructEntrypoint(MyEntrypoint, env);
+    assert.strictEqual(await constructed.rpcFunc(), 'hello from entrypoint');
+  },
+};

src/workerd/api/worker-rpc.c++

@@ -1967,9 +1967,7 @@ kj::Promise<WorkerInterface::CustomEvent::Result> JsRpcSessionCustomEventImpl::s
 // =======================================================================================
 
 jsg::Ref<WorkerEntrypoint> WorkerEntrypoint::constructor(
-    const v8::FunctionCallbackInfo<v8::Value>& args,
-    jsg::Ref<ExecutionContext> ctx,
-    jsg::JsObject env) {
+    const v8::FunctionCallbackInfo<v8::Value>& args, jsg::JsObject ctx, jsg::JsObject env) {
   // HACK: We take `FunctionCallbackInfo` mostly so that we can set properties directly on
   //   `This()`. There ought to be a better way to get access to `this` in a constructor.
   //   We *also* declare `ctx` and `env` params more explicitly just for the sake of type checking.

src/workerd/api/worker-rpc.h

@@ -492,9 +492,8 @@ class JsRpcSessionCustomEventImpl final: public WorkerInterface::CustomEvent {
 // define a constructor.
 class WorkerEntrypoint: public jsg::Object {
  public:
-  static jsg::Ref<WorkerEntrypoint> constructor(const v8::FunctionCallbackInfo<v8::Value>& args,
-      jsg::Ref<ExecutionContext> ctx,
-      jsg::JsObject env);
+  static jsg::Ref<WorkerEntrypoint> constructor(
+      const v8::FunctionCallbackInfo<v8::Value>& args, jsg::JsObject ctx, jsg::JsObject env);
 
   JSG_RESOURCE_TYPE(WorkerEntrypoint) {}
 };