React 19 API fixes

src/React.res

@@ -472,4 +472,4 @@ useEffectEvent is a React Hook that lets you extract non-reactive logic from you
 [Read more on the React Documentation](https://react.dev/reference/react/useEffectEvent)
 */
 @module("react")
-external useEffectEvent: ('event => unit) => 'event => unit = "useEffectEvent"
+external useEffectEvent: 'callback => 'callback = "useEffectEvent"

src/ReactDOM.res

@@ -91,22 +91,29 @@ module Ref = {
 
 // Hooks
 
-type formStatus<'state> = {
+@unboxed
+type formStatusActionResult =
+  | @as(undefined) Sync
+  | Async(promise<unit>)
+
+type formStatusAction = FormData.t => formStatusActionResult
+
+type formStatus = {
   /** If true, this means the parent <form> is pending submission. Otherwise, false. */
   pending: bool,
   /** An object implementing the FormData interface that contains the data the parent <form> is submitting. If there is no active submission or no parent <form>, it will be null. */
-  data: FormData.t,
+  data: nullable<FormData.t>,
   /** This represents whether the parent <form> is submitting with either a GET or POST HTTP method. By default, a <form> will use the GET method and can be specified by the method property. */
-  method: [#get | #post],
+  method: nullable<[#get | #post]>,
   /** A reference to the function passed to the action prop on the parent <form>. If there is no parent <form>, the property is null. If there is a URI value provided to the action prop, or no action prop specified, status.action will be null. */
-  action: React.action<'state, FormData.t>,
+  action: nullable<formStatusAction>,
 }
 
 external formAction: React.formAction<FormData.t> => string = "%identity"
 
 /** `useFormStatus` is a Hook that gives you status information of the last form submission. */
 @module("react-dom")
-external useFormStatus: unit => formStatus<'state> = "useFormStatus"
+external useFormStatus: unit => formStatus = "useFormStatus"
 
 // Resource Preloading APIs
 

src/ReactDOMServer.res

@@ -10,6 +10,18 @@ type resumeOptions<'error> = {
   onError?: 'error => unit,
 }
 
+type resumeToPipeableStreamOptions<'error> = {
+  ...resumeOptions<'error>,
+  onAllReady?: unit => unit,
+  onShellReady?: unit => unit,
+  onShellError?: 'error => unit,
+}
+
+type pipeableStream = {
+  pipe: ReactDOMStatic.nodeStream => ReactDOMStatic.nodeStream,
+  abort: unit => unit,
+}
+
 /**
 resume streams a pre-rendered React tree to a Readable Web Stream.
 [Read more on the React Documentation](https://react.dev/reference/react-dom/server/resume)
@@ -29,5 +41,5 @@ resumeToPipeableStream streams a pre-rendered React tree  to a pipeable Node.js
 external resumeToPipeableStream: (
   React.element,
   ReactDOMStatic.postponedState,
-  ~options: resumeOptions<'error>=?,
-) => promise<ReactDOMStatic.nodeStream> = "resumeToPipeableStream"
+  ~options: resumeToPipeableStreamOptions<'error>=?,
+) => pipeableStream = "resumeToPipeableStream"