Commits on Oct 28, 2022

1. Throw custom error object to suspend …

   The old (unstable) mechanism for suspending was to throw a promise. The
   purpose of throwing is to interrupt the component's execution, and also
   to signal to React that the interruption was caused by Suspense as
   opposed to some other error.
   
   A flaw is that throwing is meant to be an implementation details — if
   code in userspace catches the promise, it can lead to
   unexpected behavior.
   
   With `use`, userspace code does not throw promises directly, but `use`
   itself still needs to throw something to interrupt the component and
   unwind the stack.
   
   The solution is to throw an internal error. In development, we can
   detect whether the error was caught by a userspace try/catch block and
   log a warning — though it's not foolproof, since a clever user could
   catch the object and rethrow it later.
   
   The error message includes advice to move `use` outside of the
   try/catch block.
   
   I did not yet implement the warning in Flight.

   

   acdlite committed Oct 28, 2022
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