Its the single page app tax. To be honest I find it infinitely more complex than a standard old school front end but I'm also happy to pay the tax and reap the benefits in the end. Not to mention it makes things more interesting from a pure dev fun point of view.

"Now, we should define an increment action." <TYPING INTENSIFIES>. 40 lines of code later, we can increment a variable.

This project is written as a literate program and most important parts of the code are exposed. What you see there is how it's actually implemented.

The action is defined like this:

const IncrementCounter = createAction(domain, 'IncrementCounter',t.maybe(incrementParameter))

(A oneliner)

to address this confusion, I've added an "excerpt from the library" label to show which parts of the code are just parts of the actual stack.