fix(dsl): support class pointer arguments

examples/js_dsl/mod.test.ts

@@ -227,6 +227,19 @@ describe("Counter class", () => {
 		expect(c.getCount()).toEqual(2);
 	});
 
+	it("passes class pointers to exported functions", () => {
+		const c = new mod.Counter(3);
+		mod.incrementCounter(c);
+		expect(c.getCount()).toEqual(4);
+	});
+
+	it("rejects the wrong class for pointer arguments", () => {
+		expectTypeErrorWithMessage(
+			() => mod.incrementCounter(new mod.Buffer(4)),
+			"Argument 1 must be an instance of mod.Counter",
+		);
+	});
+
 	it("isAbove returns boolean", () => {
 		const c = new mod.Counter(10);
 		expect(c.isAbove(5)).toBe(true);

examples/js_dsl/mod.zig

@@ -272,6 +272,11 @@ pub const Counter = struct {
     }
 };
 
+/// Increment a counter passed as a class pointer argument.
+pub fn incrementCounter(counter: *Counter) void {
+    counter.count += 1;
+}
+
 /// A resource-owning buffer class demonstrating deinit.
 pub const Buffer = struct {
     pub const js_meta = js.class(.{});

src/js/wrap_function.zig

@@ -167,7 +167,7 @@ pub fn convertArg(comptime T: type, raw: napi.c.napi_value, env: napi.c.napi_env
     }
     switch (@typeInfo(T)) {
         .pointer => |ptr| {
-            if (ptr.size == .one and class_meta.isClassType(ptr.child)) {
+            if (comptime ptr.size == .one and class_meta.isClassType(ptr.child)) {
                 const e = napi.Env{ .env = env };
                 return e.unwrapChecked(ptr.child, value, class_runtime.typeTag(ptr.child)) catch error.TypeMismatch;
             }