Server Functions
ERSC.ServerFn.make decodes Schema input and runs an Effect handler with application services.
Callers pass the Schema's encoded type and the handler receives its decoded type. Use an ordinary
Schema.Struct(...) for object input. Use Schema.fromFormData(...) when a native form supplies the
input; a function returning void can then be passed directly to <form action>. Let the Schema
infer the handler parameter.
For form feedback with useActionState, use input: [StateSchema, FormSchema] and
handler: (previousState, form) => .... React supplies both arguments; ERSC validates and decodes
each one. Keep the native Server Function reference intact when passing it to useActionState
to retain progressive enhancement. A single Array or Tuple Schema still describes one argument.
A successful invocation refreshes the current route.