FED-2298 Add ReactNode typedef

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 7.1.0
+
+Add a new `ReactNode` type, which aliases `Object?` to mimic [the React JS Typescript type](https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/react/v17/index.d.ts#L214).
+
 ## 7.0.1
 
 Breaking change - fix nullability/typings for `ReactDom.findDomNode` and `ReactDom.render` from `package:react/react_client/react_interop.dart`:

lib/react.dart

@@ -24,14 +24,13 @@ export 'package:react/src/react_client/event_helpers.dart';
 export 'package:react/react_client/react_interop.dart' show forwardRef2, createRef, memo2;
 export 'package:react/src/react_client/synthetic_event_wrappers.dart' hide NonNativeDataTransfer;
 export 'package:react/src/react_client/synthetic_data_transfer.dart' show SyntheticDataTransfer;
-export 'package:react/src/react_client/event_helpers.dart';
 
 /// A React component declared using a function that takes in [props] and returns rendered output.
 ///
 /// See <https://reactjs.org/docs/components-and-props.html#function-and-class-components>.
 ///
 /// [props] is typed as [JsBackedMap] so that dart2js can optimize props accesses.
-typedef DartFunctionComponent = dynamic Function(JsBackedMap props);
+typedef DartFunctionComponent = /*ReactNode*/ dynamic Function(JsBackedMap props);
 
 /// The callback to a React forwardRef component. See [forwardRef2] for more details.
 ///
@@ -40,7 +39,7 @@ typedef DartFunctionComponent = dynamic Function(JsBackedMap props);
 /// In the current JS implementation, the ref argument to [React.forwardRef] is usually a JsRef object no matter the input ref type,
 /// but according to React the ref argument can be any ref type: https://github.com/facebook/flow/blob/master@%7B2020-09-08%7D/lib/react.js#L305
 /// and not just a ref object, so we type [ref] as dynamic here.
-typedef DartForwardRefFunctionComponent = dynamic Function(JsBackedMap props, dynamic ref);
+typedef DartForwardRefFunctionComponent = /*ReactNode*/ dynamic Function(JsBackedMap props, dynamic ref);
 
 typedef ComponentFactory<T extends Component> = T Function();
 
@@ -543,12 +542,10 @@ abstract class Component {
 
   /// __Required.__
   ///
-  /// When called, it should examine [props] and [state] and return a single child `Element`. This child `Element` can
-  /// be either a virtual representation of a native DOM component (such as `DivElement`) or another composite
-  /// `Component` that you've defined yourself.
+  /// When called, it should examine [props] and [state] and return a [ReactNode].
   ///
-  /// See: <https://reactjs.org/docs/react-component.html#render>
-  dynamic render();
+  /// See: <https://legacy.reactjs.org/docs/react-component.html#render>
+  /*ReactNode*/ dynamic render();
 }
 
 /// Top-level ReactJS [Component class](https://reactjs.org/docs/react-component.html)
@@ -933,13 +930,7 @@ abstract class Component2 implements Component {
   /// See: <https://reactjs.org/docs/typechecking-with-proptypes.html#proptypes>
   Map<String, PropValidator<Never>> get propTypes => {};
 
-  /// Examines [props] and [state] and returns one of the following types:
-  ///
-  /// * [ReactElement] (renders a single DOM `Element`)
-  /// * [Fragment] (renders multiple elements)
-  /// * [ReactPortal] (renders children into a different DOM subtree)
-  /// * `String` / `num` (renders text nodes in the DOM)
-  /// * `bool` / `null` (renders nothing)
+  /// Examines [props] and [state] and returns a [ReactNode].
   ///
   /// This method is __required__ for class components.
   ///
@@ -950,9 +941,9 @@ abstract class Component2 implements Component {
   /// If you need to interact with the browser / DOM apis, perform your work in [componentDidMount]
   /// or the other lifecycle methods instead. Keeping `render` pure makes components easier to think about.
   ///
-  /// See: <https://reactjs.org/docs/react-component.html#render>
+  /// See: <https://legacy.reactjs.org/docs/react-component.html#render>
   @override
-  dynamic render();
+  /*ReactNode*/ dynamic render();
 
   // ******************************************************************************************************************
   //

lib/react_client.dart

@@ -20,7 +20,7 @@ export 'package:react/react_client/component_factory.dart'
         JsBackedMapComponentFactoryMixin;
 export 'package:react/react_client/zone.dart' show componentZone;
 export 'package:react/src/react_client/chain_refs.dart' show chainRefs, chainRefList;
-export 'package:react/src/typedefs.dart' show JsFunctionComponent;
+export 'package:react/src/typedefs.dart' show JsFunctionComponent, ReactNode;
 
 /// Method used to initialize the React environment.
 ///

lib/react_client/component_factory.dart

@@ -22,7 +22,7 @@ export 'package:react/src/react_client/factory_util.dart' show generateJsProps;
 /// Currently only involves converting a top-level non-[List] [Iterable] to
 /// a non-growable [List], but this may be updated in the future to support
 /// advanced nesting and other kinds of children.
-dynamic listifyChildren(dynamic children) {
+ReactNode listifyChildren(ReactNode children) {
   if (React.isValidElement(children)) {
     // Short-circuit if we're dealing with a ReactElement to avoid the dart2js
     // interceptor lookup involved in Dart type-checking.
@@ -63,7 +63,7 @@ Map unconvertJsProps(/* ReactElement|ReactComponent */ instance) {
 /// Shared component factory proxy [build] method for components that utilize [JsBackedMap]s.
 mixin JsBackedMapComponentFactoryMixin on ReactComponentFactoryProxy {
   @override
-  ReactElement build(Map props, [List childrenArgs = const []]) {
+  ReactElement build(Map props, [List<ReactNode> childrenArgs = const []]) {
     final children = generateChildren(childrenArgs, shouldAlwaysBeList: true);
     final convertedProps = generateExtendedJsProps(props);
     return React.createElement(type, convertedProps, children);
@@ -89,7 +89,7 @@ class ReactDartComponentFactoryProxy<TComponent extends Component> extends React
   ReactClass get type => reactClass;
 
   @override
-  ReactElement build(Map props, [List childrenArgs = const []]) {
+  ReactElement build(Map props, [List<ReactNode> childrenArgs = const []]) {
     var children = convertArgsToChildren(childrenArgs);
     children = listifyChildren(children);
 
@@ -98,7 +98,7 @@ class ReactDartComponentFactoryProxy<TComponent extends Component> extends React
 
   /// Returns a JavaScript version of the specified [props], preprocessed for consumption by ReactJS and prepared for
   /// consumption by the `react` library internals.
-  static InteropProps generateExtendedJsProps(Map props, dynamic children, {Map? defaultProps}) {
+  static InteropProps generateExtendedJsProps(Map props, ReactNode children, {Map? defaultProps}) {
     if (children == null) {
       children = [];
     } else if (children is! Iterable) {
@@ -212,8 +212,8 @@ class ReactJsContextComponentFactoryProxy extends ReactJsComponentFactoryProxy {
         super(jsClass, shouldConvertDomProps: shouldConvertDomProps);
 
   @override
-  ReactElement build(Map props, [List childrenArgs = const []]) {
-    dynamic children = generateChildren(childrenArgs);
+  ReactElement build(Map props, [List<ReactNode> childrenArgs = const []]) {
+    var children = generateChildren(childrenArgs);
 
     if (isConsumer) {
       if (children is Function) {
@@ -271,7 +271,7 @@ class ReactJsComponentFactoryProxy extends ReactComponentFactoryProxy {
   }
 
   @override
-  ReactElement build(Map props, [List childrenArgs = const []]) {
+  ReactElement build(Map props, [List<ReactNode> childrenArgs = const []]) {
     final children = generateChildren(childrenArgs, shouldAlwaysBeList: alwaysReturnChildrenAsList);
     final convertedProps =
         generateJsProps(props, convertCallbackRefValue: false, additionalRefPropKeys: _additionalRefPropKeys);
@@ -292,7 +292,7 @@ class ReactDomComponentFactoryProxy extends ReactComponentFactoryProxy {
   String get type => name;
 
   @override
-  ReactElement build(Map props, [List childrenArgs = const []]) {
+  ReactElement build(Map props, [List<ReactNode> childrenArgs = const []]) {
     final children = generateChildren(childrenArgs);
     final convertedProps = generateJsProps(props, convertCallbackRefValue: false, wrapWithJsify: true);
     return React.createElement(type, convertedProps, children);

lib/react_client/react_interop.dart

@@ -17,6 +17,7 @@ import 'package:react/react.dart';
 import 'package:react/react_client/js_backed_map.dart';
 import 'package:react/react_client/component_factory.dart' show ReactDartWrappedComponentFactoryProxy;
 import 'package:react/src/react_client/dart2_interop_workaround_bindings.dart';
+import 'package:react/src/typedefs.dart';
 
 typedef ReactJsComponentFactory = ReactElement Function(dynamic props, dynamic children);
 
@@ -27,14 +28,14 @@ typedef ReactJsComponentFactory = ReactElement Function(dynamic props, dynamic c
 @JS()
 abstract class React {
   external static String get version;
-  external static ReactElement cloneElement(ReactElement element, [JsMap? props, Object? children]);
+  external static ReactElement cloneElement(ReactElement element, [JsMap? props, ReactNode children]);
   external static ReactContext createContext([
     dynamic defaultValue,
     int Function(dynamic currentValue, dynamic nextValue)? calculateChangedBits,
   ]);
   @Deprecated('For internal use only.')
   external static ReactClass createClass(ReactClassConfig reactClassConfig);
-  external static ReactElement createElement(dynamic type, props, [Object? children]);
+  external static ReactElement createElement(dynamic type, props, [ReactNode children]);
   external static JsRef createRef();
   external static ReactClass forwardRef(Function(JsMap props, dynamic ref) wrapperFunction);
   external static ReactClass memo(
@@ -274,8 +275,8 @@ ReactComponentFactoryProxy memo2(ReactComponentFactoryProxy factory,
 }
 
 abstract class ReactDom {
-  static Element? findDOMNode(dynamic object) => ReactDOM.findDOMNode(object);
-  static dynamic render(dynamic component, Element element) => ReactDOM.render(component, element);
+  static Element? findDOMNode(ReactNode object) => ReactDOM.findDOMNode(object);
+  static dynamic render(ReactNode component, Element element) => ReactDOM.render(component, element);
   static bool unmountComponentAtNode(Element element) => ReactDOM.unmountComponentAtNode(element);
 
   /// Returns a a portal that renders [children] into a [container].
@@ -285,7 +286,7 @@ abstract class ReactDom {
   /// [children] can be any renderable React child, such as a [ReactElement], [String], or fragment.
   ///
   /// See: <https://reactjs.org/docs/portals.html>
-  static ReactPortal createPortal(dynamic children, Element container) => ReactDOM.createPortal(children, container);
+  static ReactPortal createPortal(ReactNode children, Element container) => ReactDOM.createPortal(children, container);
 }
 
 @JS('ReactDOMServer')

lib/src/react_client/dart2_interop_workaround_bindings.dart

@@ -5,11 +5,12 @@ import 'dart:html';
 
 import 'package:js/js.dart';
 import 'package:react/react_client/react_interop.dart';
+import 'package:react/src/typedefs.dart';
 
 @JS()
 abstract class ReactDOM {
-  external static Element? findDOMNode(dynamic object);
-  external static dynamic render(dynamic component, Element element);
+  external static Element? findDOMNode(ReactNode object);
+  external static dynamic render(ReactNode component, Element element);
   external static bool unmountComponentAtNode(Element element);
-  external static ReactPortal createPortal(dynamic children, Element container);
+  external static ReactPortal createPortal(ReactNode children, Element container);
 }

lib/src/react_client/dart_interop_statics.dart

@@ -180,7 +180,7 @@ final ReactDartInteropStatics dartInteropStatics = (() {
       });
 
   /// Wrapper for [Component.render].
-  dynamic handleRender(Component component) => zone.run(() {
+  ReactNode handleRender(Component component) => zone.run(() {
         return component.render();
       });
 
@@ -317,7 +317,7 @@ abstract class ReactDartInteropStatics2 {
         }
       });
 
-  static dynamic handleRender(Component2 component, JsMap jsProps, JsMap jsState, dynamic jsContext) => // dartfmt
+  static ReactNode handleRender(Component2 component, JsMap jsProps, JsMap jsState, dynamic jsContext) => // dartfmt
       // ignore: invalid_use_of_visible_for_testing_member
       componentZone.run(() {
         _updatePropsAndStateWithJs(component, jsProps, jsState);

lib/src/react_client/factory_util.dart

@@ -8,6 +8,7 @@ import 'package:react/react_client/js_backed_map.dart';
 import 'package:react/react_client/js_interop_helpers.dart';
 import 'package:react/react_client/react_interop.dart';
 import 'package:react/src/react_client/internal_react_interop.dart';
+import 'package:react/src/typedefs.dart';
 
 /// Converts a list of variadic children arguments to children that should be passed to ReactJS.
 ///
@@ -16,7 +17,7 @@ import 'package:react/src/react_client/internal_react_interop.dart';
 /// - `null` if there are no args
 /// - the single child if only one was specified
 /// - otherwise, the same list of args, will all top-level children validated
-dynamic convertArgsToChildren(List childrenArgs) {
+ReactNode convertArgsToChildren(List childrenArgs) {
   if (childrenArgs.isEmpty) {
     return null;
   } else if (childrenArgs.length == 1) {
@@ -98,7 +99,7 @@ bool isRefArgumentDefinitelyNonNullable(Function(Never) callbackRef) {
 /// - `[]` if there are no args and [shouldAlwaysBeList] is true
 /// - the single child if only one was specified
 /// - otherwise, the same list of args, will all top-level children validated
-dynamic generateChildren(List childrenArgs, {bool shouldAlwaysBeList = false}) {
+ReactNode generateChildren(List childrenArgs, {bool shouldAlwaysBeList = false}) {
   var children;
 
   if (childrenArgs.isEmpty) {

lib/src/react_client/internal_react_interop.dart

@@ -11,6 +11,7 @@ import 'package:react/react_client/bridge.dart';
 import 'package:react/react_client/js_backed_map.dart';
 import 'package:react/react_client/react_interop.dart'
     show React, ReactClass, ReactComponent, ReactDartComponentInternal;
+import 'package:react/src/typedefs.dart';
 
 /// A JavaScript interop class representing a value in a React JS `context` object.
 ///
@@ -116,7 +117,7 @@ class ReactDartInteropStatics {
     void Function(Component component, InteropContextValue nextContext) handleComponentWillUpdate,
     void Function(Component component, ReactDartComponentInternal prevInternal) handleComponentDidUpdate,
     void Function(Component component) handleComponentWillUnmount,
-    dynamic Function(Component component) handleRender,
+    ReactNode Function(Component component) handleRender,
   });
 }
 

lib/src/typedefs.dart

@@ -13,9 +13,9 @@ typedef CallbackRef<T> = Function(T? componentOrDomNode);
 /// - [props] will always be supplied as the first argument
 /// - [legacyContext] has been deprecated and should not be used but remains for backward compatibility and is necessary
 /// to match Dart's generated call signature based on the number of args React provides.
-typedef JsFunctionComponent = dynamic Function(JsMap props, [JsMap? legacyContext]);
+typedef JsFunctionComponent = /*ReactNode*/ dynamic Function(JsMap props, [JsMap? legacyContext]);
 
-typedef JsForwardRefFunctionComponent = dynamic Function(JsMap props, dynamic ref);
+typedef JsForwardRefFunctionComponent = /*ReactNode*/ dynamic Function(JsMap props, dynamic ref);
 
 /// Typedef for `react.Component.ref`, which should return one of the following specified by the provided [ref]:
 ///
@@ -32,3 +32,15 @@ typedef StateUpdaterCallback = Map? Function(Map prevState, Map props);
 ///
 /// See: <https://reactjs.org/docs/react-component.html#setstate>
 typedef SetStateCallback = Function();
+
+/// A value that can be returned from a component's `render`, or used as `children`.
+///
+/// Possible values include:
+/// * A `ReactElement` such as a DOM element created using `react.div({})`, or a user-defined component.
+/// * A `ReactPortal` created by `createPortal`.
+/// * A `String` or `num` (Rendered as text nodes in the DOM).
+/// * Booleans or `null` (Render nothing).
+/// * A list of, or a `ReactFragment` containing, any/all of the above.
+///
+/// See also: https://github.com/facebook/react/blob/b3003047101b4c7a643788a8faf576f7e370fb45/packages/shared/ReactTypes.js#L10
+typedef ReactNode = Object?;

pubspec.yaml

@@ -3,7 +3,7 @@ version: 7.0.1
 description: Bindings of the ReactJS library for building interactive interfaces.
 homepage: https://github.com/cleandart/react-dart
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.13.0 <3.0.0'
 dependencies:
   js: ^0.6.3
   meta: ^1.6.0

test/forward_ref_test.dart

@@ -36,7 +36,9 @@ main() {
 
       test('when displayName argument is passed to forwardRef2', () {
         const name = 'ForwardRefTestComponent';
-        final ForwardRefTestComponent = forwardRef2((props, ref) {}, displayName: name);
+        final ForwardRefTestComponent = forwardRef2((props, ref) {
+          return null;
+        }, displayName: name);
         expect(getProperty(getProperty(ForwardRefTestComponent.type as Object, 'render'), 'name'), name);
       });
     });