Commits on Sep 7, 2023

1. useFormState: Emit comment to mark whether state matches …

   A planned feature of useFormState is that if page load is the result of an
   MPA-style form submission — i.e. a form was submitted before it was hydrated,
   using Server Actions — the state should transfer to the next page.
   
   I haven't implemented that part yet, but as a prerequisite, we need some way for
   Fizz to indicate whether a useFormState hook was rendered using the "postback"
   state. That way we can do all state matching logic on the server without
   having to replicate it on the client, too.
   
   The approach here is to emit a comment node for each useFormState hook. We use
   one of two comment types: `<!--F-->` for a normal useFormState hook, and
   `<!--F!-->` for a hook that was rendered using the postback state. React will
   read these markers during hydration. This is similar to how we encode
   Suspense boundaries.
   
   Again, the actual matching algorithm is not yet implemented — for now, the
   "not matching" marker is always emitted.
   
   We can optimize this further by not emitting any markers for a render that is
   not the result of a form postback, which I'll do in subsequent PRs.

   

   acdlite committed Sep 7, 2023
   Configuration menu

   • View commit details
   • Copy full SHA for 18da28b
   • Browse repository at this point

   Copy the full SHA

   18da28b View commit details

   Browse the repository at this point in the history