ReactDOM.useEvent add flag and entry point

fxi

packages/react-dom/src/client/ReactDOM.js

@@ -20,6 +20,7 @@ import {
   unmountComponentAtNode,
 } from './ReactDOMLegacy';
 import {createRoot, createBlockingRoot, isValidContainer} from './ReactDOMRoot';
+import {useEvent} from './ReactDOMUseEvent';
 
 import {
   batchedEventUpdates,
@@ -218,6 +219,8 @@ export {
   // Temporary alias since we already shipped React 16 RC with it.
   // TODO: remove in React 17.
   unstable_createPortal,
+  // enableUseEventAPI
+  useEvent as unstable_useEvent,
 };
 
 const foundDevTools = injectIntoDevTools({

packages/react-dom/src/client/ReactDOMUseEvent.js

@@ -0,0 +1,74 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+import type {EventPriority} from 'shared/ReactTypes';
+import type {
+  ReactDOMListenerEvent,
+  ReactDOMListenerMap,
+} from 'shared/ReactDOMTypes';
+
+import ReactSharedInternals from 'shared/ReactSharedInternals';
+import invariant from 'shared/invariant';
+
+import {getEventPriorityForListenerSystem} from '../events/DOMEventProperties';
+
+type EventOptions = {|
+  capture?: boolean,
+  passive?: boolean,
+  priority?: EventPriority,
+|};
+
+const {ReactCurrentDispatcher} = ReactSharedInternals;
+
+function resolveDispatcher() {
+  const dispatcher = ReactCurrentDispatcher.current;
+  invariant(
+    dispatcher !== null,
+    'Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for' +
+      ' one of the following reasons:\n' +
+      '1. You might have mismatching versions of React and the renderer (such as React DOM)\n' +
+      '2. You might be breaking the Rules of Hooks\n' +
+      '3. You might have more than one copy of React in the same app\n' +
+      'See https://fb.me/react-invalid-hook-call for tips about how to debug and fix this problem.',
+  );
+  return dispatcher;
+}
+
+export function useEvent(
+  type: string,
+  options?: EventOptions,
+): ReactDOMListenerMap {
+  const dispatcher = resolveDispatcher();
+  let capture = false;
+  let passive = false;
+  let priority = getEventPriorityForListenerSystem((type: any));
+
+  if (options != null) {
+    const optionsCapture = options.capture;
+    const optionsPassive = options.passive;
+    const optionsPriority = options.priority;
+
+    if (typeof optionsCapture === 'boolean') {
+      capture = optionsCapture;
+    }
+    if (typeof optionsPassive === 'boolean') {
+      passive = optionsPassive;
+    }
+    if (typeof optionsPriority === 'number') {
+      priority = optionsPriority;
+    }
+  }
+  const event: ReactDOMListenerEvent = {
+    capture,
+    passive,
+    priority,
+    type,
+  };
+  return dispatcher.useEvent(event);
+}

packages/react-dom/src/events/DOMEventProperties.js

@@ -223,3 +223,17 @@ export function getEventPriorityForPluginSystem(
   // for the event.
   return priority === undefined ? ContinuousEvent : priority;
 }
+
+export function getEventPriorityForListenerSystem(type: string): EventPriority {
+  const priority = eventPriorities.get(((type: any): TopLevelType));
+  if (priority !== undefined) {
+    return priority;
+  }
+  if (__DEV__) {
+    console.warn(
+      'The event "type" provided to useEvent() does not have a known priority type.' +
+        ' It is recommended to provide a "priority" option to specify a priority.',
+    );
+  }
+  return ContinuousEvent;
+}

packages/shared/ReactDOMTypes.js

@@ -75,3 +75,23 @@ export type ReactDOMResponderContext = {
   getResponderNode(): Element | null,
   ...
 };
+
+export type ReactDOMListenerEvent = {|
+  capture: boolean,
+  passive: boolean,
+  priority: EventPriority,
+  type: string,
+|};
+
+export type ReactDOMListenerMap = {|
+  clear: () => void,
+  setListener: (instance: EventTarget, callback: ?(Event) => void) => void,
+|};
+
+export type ReactDOMListener = {|
+  callback: Event => void,
+  depth: number,
+  destroy: Document | (Element => void),
+  event: ReactDOMListenerEvent,
+  instance: EventTarget,
+|};

packages/shared/ReactFeatureFlags.js

@@ -60,6 +60,9 @@ export const enableFundamentalAPI = false;
 // Experimental Scope support.
 export const enableScopeAPI = false;
 
+// Experimental useEvent support.
+export const enableUseEventAPI = false;
+
 // New API for JSX transforms to target - https://github.com/reactjs/rfcs/pull/107
 
 // We will enforce mocking scheduler with scheduler/unstable_mock at some point. (v17?)

packages/shared/forks/ReactFeatureFlags.native-fb.js

@@ -30,6 +30,7 @@ export const warnAboutDeprecatedLifecycles = true;
 export const enableDeprecatedFlareAPI = false;
 export const enableFundamentalAPI = false;
 export const enableScopeAPI = false;
+export const enableUseEventAPI = false;
 export const warnAboutUnmockedScheduler = true;
 export const flushSuspenseFallbacksInTests = true;
 export const enableSuspenseCallback = false;

packages/shared/forks/ReactFeatureFlags.native-oss.js

@@ -29,6 +29,7 @@ export const enableSchedulerDebugging = false;
 export const enableDeprecatedFlareAPI = false;
 export const enableFundamentalAPI = false;
 export const enableScopeAPI = false;
+export const enableUseEventAPI = false;
 export const warnAboutUnmockedScheduler = false;
 export const flushSuspenseFallbacksInTests = true;
 export const enableSuspenseCallback = false;

packages/shared/forks/ReactFeatureFlags.test-renderer.js

@@ -29,6 +29,7 @@ export const enableSchedulerDebugging = false;
 export const enableDeprecatedFlareAPI = false;
 export const enableFundamentalAPI = false;
 export const enableScopeAPI = false;
+export const enableUseEventAPI = false;
 export const warnAboutUnmockedScheduler = false;
 export const flushSuspenseFallbacksInTests = true;
 export const enableSuspenseCallback = false;

packages/shared/forks/ReactFeatureFlags.test-renderer.www.js

@@ -29,6 +29,7 @@ export const disableInputAttributeSyncing = false;
 export const enableDeprecatedFlareAPI = true;
 export const enableFundamentalAPI = false;
 export const enableScopeAPI = true;
+export const enableUseEventAPI = false;
 export const warnAboutUnmockedScheduler = true;
 export const flushSuspenseFallbacksInTests = true;
 export const enableSuspenseCallback = true;

packages/shared/forks/ReactFeatureFlags.testing.js

@@ -29,6 +29,7 @@ export const enableSchedulerDebugging = false;
 export const enableDeprecatedFlareAPI = false;
 export const enableFundamentalAPI = false;
 export const enableScopeAPI = false;
+export const enableUseEventAPI = false;
 export const warnAboutUnmockedScheduler = false;
 export const flushSuspenseFallbacksInTests = true;
 export const enableSuspenseCallback = false;

packages/shared/forks/ReactFeatureFlags.testing.www.js

@@ -29,6 +29,7 @@ export const enableSchedulerDebugging = false;
 export const enableDeprecatedFlareAPI = true;
 export const enableFundamentalAPI = false;
 export const enableScopeAPI = true;
+export const enableUseEventAPI = false;
 export const warnAboutUnmockedScheduler = true;
 export const flushSuspenseFallbacksInTests = true;
 export const enableSuspenseCallback = true;

packages/shared/forks/ReactFeatureFlags.www.js

@@ -88,6 +88,8 @@ export const enableFundamentalAPI = false;
 
 export const enableScopeAPI = true;
 
+export const enableUseEventAPI = false;
+
 export const warnAboutUnmockedScheduler = true;
 
 export const enableSuspenseCallback = true;