Function JS_NewObjectWithGivenProto 

pub fn JS_NewObjectWithGivenProto(
    cx: &mut JSContext,
    clasp: Option<&'static JSClass>,
    proto: Handle<'_, *mut JSObject>,
) -> *mut JSObject

Safe wrapper around js::rust::wrappers2::JS_NewObjectWithGivenProto. Passing None for clasp creates a plain object.