diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index a6f03f5c430..b833d431f7f 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -2531,15 +2531,10 @@ assert!(!prototype_proto.ptr.is_null());""" % getPrototypeProto)]
         properties = {"id": name}
         for arrayName in self.properties.arrayNames():
             array = getattr(self.properties, arrayName)
-            if arrayName == "consts":
-                if array.length():
-                    properties[arrayName] = array.variableName()
-                else:
-                    properties[arrayName] = "&[]"
-            elif array.length():
-                properties[arrayName] = "Some(%s)" % array.variableName()
+            if array.length():
+                properties[arrayName] = array.variableName()
             else:
-                properties[arrayName] = "None"
+                properties[arrayName] = "&[]"
 
         code.append(CGGeneric("""
 let mut prototype = RootedObject::new(cx, ptr::null_mut());
diff --git a/components/script/dom/bindings/interface.rs b/components/script/dom/bindings/interface.rs
index 9ce31b8bd36..f1e6a886eb7 100644
--- a/components/script/dom/bindings/interface.rs
+++ b/components/script/dom/bindings/interface.rs
@@ -227,8 +227,8 @@ pub unsafe fn create_interface_prototype_object(
         cx: *mut JSContext,
         proto: HandleObject,
         class: &'static JSClass,
-        regular_methods: Option<&'static [Prefable<JSFunctionSpec>]>,
-        regular_properties: Option<&'static [Prefable<JSPropertySpec>]>,
+        regular_methods: &'static [Prefable<JSFunctionSpec>],
+        regular_properties: &'static [Prefable<JSPropertySpec>],
         constants: &'static [Prefable<ConstantSpec>],
         rval: MutableHandleObject) {
     create_object(cx, proto, class, regular_methods, regular_properties, constants, rval);
@@ -240,8 +240,8 @@ pub unsafe fn create_noncallback_interface_object(
         receiver: HandleObject,
         proto: HandleObject,
         class: &'static NonCallbackInterfaceObjectClass,
-        static_methods: Option<&'static [Prefable<JSFunctionSpec>]>,
-        static_properties: Option<&'static [Prefable<JSPropertySpec>]>,
+        static_methods: &'static [Prefable<JSFunctionSpec>],
+        static_properties: &'static [Prefable<JSPropertySpec>],
         constants: &'static [Prefable<ConstantSpec>],
         interface_prototype_object: HandleObject,
         name: &'static [u8],
@@ -354,36 +354,34 @@ unsafe fn create_object(
         cx: *mut JSContext,
         proto: HandleObject,
         class: &'static JSClass,
-        methods: Option<&'static [Prefable<JSFunctionSpec>]>,
-        properties: Option<&'static [Prefable<JSPropertySpec>]>,
+        methods: &'static [Prefable<JSFunctionSpec>],
+        properties: &'static [Prefable<JSPropertySpec>],
         constants: &'static [Prefable<ConstantSpec>],
         rval: MutableHandleObject) {
     rval.set(JS_NewObjectWithUniqueType(cx, class, proto));
     assert!(!rval.ptr.is_null());
-    if let Some(methods) = methods {
-        define_prefable_methods(cx, rval.handle(), methods);
-    }
-    if let Some(properties) = properties {
-        define_prefable_properties(cx, rval.handle(), properties);
-    }
+    define_prefable_methods(cx, rval.handle(), methods);
+    define_prefable_properties(cx, rval.handle(), properties);
     for prefable in constants {
         define_constants(cx, rval.handle(), prefable.specs());
     }
 }
 
 /// Conditionally define methods on an object.
-pub unsafe fn define_prefable_methods(cx: *mut JSContext,
-                                      obj: HandleObject,
-                                      methods: &'static [Prefable<JSFunctionSpec>]) {
+pub unsafe fn define_prefable_methods(
+        cx: *mut JSContext,
+        obj: HandleObject,
+        methods: &'static [Prefable<JSFunctionSpec>]) {
     for prefable in methods {
         define_methods(cx, obj, prefable.specs()).unwrap();
     }
 }
 
 /// Conditionally define properties on an object.
-pub unsafe fn define_prefable_properties(cx: *mut JSContext,
-                                         obj: HandleObject,
-                                         properties: &'static [Prefable<JSPropertySpec>]) {
+pub unsafe fn define_prefable_properties(
+        cx: *mut JSContext,
+        obj: HandleObject,
+        properties: &'static [Prefable<JSPropertySpec>]) {
     for prefable in properties {
         define_properties(cx, obj, prefable.specs()).unwrap();
     }