Why dirtyFields not updating if i make any field dirty?

Why dirty fields not updating if I make any field dirty.

Steps to reproduce the behavior:

1. Go to https://codesandbox.io/s/7o2wrp86k6
2. Type into any field.
3. I expect dirtyFields to update with the field details.
4. Error: dirtyFields is always empty.

[bluebill1049]

updated 😃

[bluebill1049]

I think i need to find a better term to describe the invoke, people probably gets confused.

const { dirty } = formState; // read the individual state before the render

instead of

return <div>{formState.dirty}</div>