resolve or remove unneeded unused-promise Flow annotations

packages/react-native/Libraries/Components/DrawerAndroid/DrawerLayoutAndroid.android.js

@@ -150,7 +150,6 @@ class DrawerLayoutAndroid
    * LTI update could not be added via codemod */
   _onDrawerSlide = event => {
     if (this.props.onDrawerSlide) {
-      // $FlowFixMe[unused-promise]
       this.props.onDrawerSlide(event);
     }
     if (this.props.keyboardDismissMode === 'on-drag') {

packages/react-native/Libraries/Components/Keyboard/KeyboardAvoidingView.js

@@ -112,14 +112,12 @@ class KeyboardAvoidingView extends React.Component<
 
   _onKeyboardChange = (event: ?KeyboardEvent) => {
     this._keyboardEvent = event;
-    // $FlowFixMe[unused-promise]
-    this._updateBottomIfNecessary();
+    void this._updateBottomIfNecessary();
   };
 
   _onKeyboardHide = (event: ?KeyboardEvent) => {
     this._keyboardEvent = null;
-    // $FlowFixMe[unused-promise]
-    this._updateBottomIfNecessary();
+    void this._updateBottomIfNecessary();
   };
 
   _onLayout = async (event: ViewLayoutEvent) => {

packages/react-native/Libraries/Components/RefreshControl/RefreshControl.js

@@ -186,8 +186,7 @@ class RefreshControl extends React.Component<RefreshControlProps> {
   _onRefresh = () => {
     this._lastNativeRefreshing = true;
 
-    // $FlowFixMe[unused-promise]
-    this.props.onRefresh && this.props.onRefresh();
+    this.props.onRefresh && void this.props.onRefresh();
 
     // The native component will start refreshing so force an update to
     // make sure it stays in sync with the js component.

packages/react-native/Libraries/Components/Switch/Switch.js

@@ -199,10 +199,8 @@ const Switch: component(
   const [native, setNative] = useState({value: (null: ?boolean)});
 
   const handleChange = (event: SwitchChangeEvent) => {
-    // $FlowFixMe[unused-promise]
-    onChange?.(event);
-    // $FlowFixMe[unused-promise]
-    onValueChange?.(event.nativeEvent.value);
+    void onChange?.(event);
+    void onValueChange?.(event.nativeEvent.value);
     setNative({value: event.nativeEvent.value});
   };
 

packages/react-native/Libraries/Core/Devtools/openFileInEditor.js

@@ -13,8 +13,7 @@
 const getDevServer = require('./getDevServer').default;
 
 export default function openFileInEditor(file: string, lineNumber: number) {
-  // $FlowFixMe[unused-promise]
-  fetch(getDevServer().url + 'open-stack-frame', {
+  void fetch(getDevServer().url + 'open-stack-frame', {
     method: 'POST',
     headers: {
       'Content-Type': 'application/json',

packages/react-native/Libraries/Core/Devtools/openURLInBrowser.js

@@ -13,8 +13,7 @@
 const getDevServer = require('./getDevServer').default;
 
 export default function openURLInBrowser(url: string) {
-  // $FlowFixMe[unused-promise]
-  fetch(getDevServer().url + 'open-url', {
+  void fetch(getDevServer().url + 'open-url', {
     method: 'POST',
     headers: {
       'Content-Type': 'application/json',

packages/react-native/Libraries/LogBox/Data/__tests__/LogBoxSymbolication-test.js

@@ -40,20 +40,16 @@ describe('LogBoxSymbolication', () => {
   });
 
   it('symbolicates different stacks', () => {
-    // $FlowFixMe[unused-promise]
-    LogBoxSymbolication.symbolicate(createStack(['A', 'B', 'C']));
-    // $FlowFixMe[unused-promise]
-    LogBoxSymbolication.symbolicate(createStack(['D', 'E', 'F']));
+    void LogBoxSymbolication.symbolicate(createStack(['A', 'B', 'C']));
+    void LogBoxSymbolication.symbolicate(createStack(['D', 'E', 'F']));
 
     expect(symbolicateStackTrace.mock.calls.length).toBe(2);
   });
 
   it('batch symbolicates equivalent stacks', () => {
     const stack = createStack(['A', 'B', 'C']);
-    // $FlowFixMe[unused-promise]
-    LogBoxSymbolication.symbolicate(stack);
-    // $FlowFixMe[unused-promise]
-    LogBoxSymbolication.symbolicate(stack);
+    void LogBoxSymbolication.symbolicate(stack);
+    void LogBoxSymbolication.symbolicate(stack);
 
     expect(symbolicateStackTrace.mock.calls.length).toBe(1);
   });

packages/react-native/Libraries/LogBox/UI/LogBoxMessage.js

@@ -76,8 +76,7 @@ function TappableLinks(props: {
     fragments.push(
       <Text
         onPress={() => {
-          // $FlowFixMe[unused-promise]
-          Linking.openURL(link);
+          void Linking.openURL(link);
         }}
         key={++indexCounter}
         style={styles.linkText}>

packages/react-native/Libraries/ReactNative/AppRegistryImpl.js

@@ -281,8 +281,7 @@ export function startHeadlessTask(
         NativeHeadlessJsTaskSupport &&
         reason instanceof HeadlessJsTaskError
       ) {
-        // $FlowFixMe[unused-promise]
-        NativeHeadlessJsTaskSupport.notifyTaskRetry(taskId).then(
+        void NativeHeadlessJsTaskSupport.notifyTaskRetry(taskId).then(
           retryPosted => {
             if (!retryPosted) {
               NativeHeadlessJsTaskSupport.notifyTaskFinished(taskId);