Type issue with `1.115` upgrade

Following type upgrade, now code has to look like this:
let a = MessageBox.Action.ABORT;

However when having to type out an argument of a callback function with the possible Actions, I find myself having to do this:

                    myCallback(
                        action: (typeof MessageBox.Action)[keyof typeof MessageBox.Action],
                    ) => {
                        if (action === MessageBox.Action.OK) {
                            allGood()
                        } else {
                            badStuff();
                        }
                    }

which is quite cumbersome. The natural approach of typing action as MessageBox.Action does not seem to work, I get

Cannot access 'MessageBox.Action' because 'MessageBox' is a type, but not a namespace. Did you mean to retrieve the type of the property 'Action' in 'MessageBox' with 'MessageBox["Action"]'

Am I missing something?

Many thanks

Start by reproducing the callback-parameter error shown for MessageBox.Action after the 1.115 type upgrade, then inspect the relevant type declarations to determine how Action is exposed. Done means the supported way to type a callback argument is documented or the type issue is corrected, with the example compiling.