dev/core#2823 Extract code to load the declarations and call from the constructor

dev/core#2823 Extract code to load the declarations and call from the constructor

The declarations are only used in object context so it makes sense to load
them in the constructor. In addition they are ALWAYS loaded except in test usage
(it does seem a bit silly having the option to pass them in only for tests
but we can ignore that for now - I commented it)