diff --git a/package.json b/package.json
index 356b8fb7bf068..ed2c480305bea 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
     "@babel/code-frame": "^7.0.0",
     "@babel/core": "^7.0.0",
     "@babel/helper-module-imports": "^7.0.0",
+    "@babel/parser": "^7.0.0",
     "@babel/plugin-external-helpers": "^7.0.0",
     "@babel/plugin-proposal-class-properties": "^7.0.0",
     "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
@@ -36,7 +37,6 @@
     "art": "^0.10.1",
     "babel-eslint": "^10.0.0",
     "babel-plugin-syntax-trailing-function-commas": "^6.5.0",
-    "babylon": "6.18.0",
     "chalk": "^1.1.3",
     "cli-table": "^0.3.1",
     "coffee-script": "^1.8.0",
@@ -56,7 +56,7 @@
     "eslint-plugin-react-internal": "link:./scripts/eslint-rules",
     "fbjs-scripts": "^0.8.3",
     "filesize": "^3.5.6",
-    "flow-bin": "^0.72.0",
+    "flow-bin": "^0.84.0",
     "glob": "^6.0.4",
     "glob-stream": "^6.1.0",
     "google-closure-compiler": "20190301.0.0",
diff --git a/packages/create-subscription/src/createSubscription.js b/packages/create-subscription/src/createSubscription.js
index 88143bc2f97ba..b7750bb319ae4 100644
--- a/packages/create-subscription/src/createSubscription.js
+++ b/packages/create-subscription/src/createSubscription.js
@@ -29,10 +29,10 @@ export function createSubscription<Property, Value>(
       callback: (value: Value | void) => void,
     ) => Unsubscribe,
   |}>,
-): React$ComponentType<{
+): React$ComponentType<{|
   children: (value: Value | void) => React$Node,
   source: Property,
-}> {
+|}> {
   const {getCurrentValue, subscribe} = config;
 
   if (__DEV__) {
@@ -44,14 +44,14 @@ export function createSubscription<Property, Value>(
     }
   }
 
-  type Props = {
+  type Props = {|
     children: (value: Value) => React$Element<any>,
     source: Property,
-  };
-  type State = {
+  |};
+  type State = {|
     source: Property,
     value: Value | void,
-  };
+  |};
 
   // Reference: https://gist.github.com/bvaughn/d569177d70b50b58bff69c3c4a5353f3
   class Subscription extends React.Component<Props, State> {
diff --git a/packages/legacy-events/EventPluginRegistry.js b/packages/legacy-events/EventPluginRegistry.js
index e1a670dc32267..64c2a9a1e03e8 100644
--- a/packages/legacy-events/EventPluginRegistry.js
+++ b/packages/legacy-events/EventPluginRegistry.js
@@ -16,7 +16,7 @@ import type {
 
 import invariant from 'shared/invariant';
 
-type NamesToPlugins = {[key: PluginName]: PluginModule<AnyNativeEvent>};
+type NamesToPlugins = {[key: PluginName]: PluginModule<AnyNativeEvent>, ...};
 type EventPluginOrder = null | Array<PluginName>;
 
 /**
diff --git a/packages/legacy-events/PluginModuleType.js b/packages/legacy-events/PluginModuleType.js
index 1e7635114f779..04ec9e67357e5 100644
--- a/packages/legacy-events/PluginModuleType.js
+++ b/packages/legacy-events/PluginModuleType.js
@@ -15,7 +15,7 @@ import type {
 import type {TopLevelType} from './TopLevelEventTypes';
 import type {EventSystemFlags} from 'legacy-events/EventSystemFlags';
 
-export type EventTypes = {[key: string]: DispatchConfig};
+export type EventTypes = {[key: string]: DispatchConfig, ...};
 
 export type AnyNativeEvent = Event | KeyboardEvent | MouseEvent | Touch;
 
@@ -31,4 +31,5 @@ export type PluginModule<NativeEvent> = {
     eventSystemFlags: EventSystemFlags,
   ) => ?ReactSyntheticEvent,
   tapMoveThreshold?: number,
+  ...
 };
diff --git a/packages/legacy-events/ReactSyntheticEventType.js b/packages/legacy-events/ReactSyntheticEventType.js
index 71ae77fa0eda4..922d49d5c30f8 100644
--- a/packages/legacy-events/ReactSyntheticEventType.js
+++ b/packages/legacy-events/ReactSyntheticEventType.js
@@ -12,17 +12,17 @@ import type {Fiber} from 'react-reconciler/src/ReactFiber';
 import type {EventPriority} from 'shared/ReactTypes';
 import type {TopLevelType} from './TopLevelEventTypes';
 
-export type DispatchConfig = {
+export type DispatchConfig = {|
   dependencies: Array<TopLevelType>,
-  phasedRegistrationNames?: {
+  phasedRegistrationNames?: {|
     bubbled: string,
     captured: string,
-  },
+  |},
   registrationName?: string,
   eventPriority: EventPriority,
-};
+|};
 
-export type ReactSyntheticEvent = {
+export type ReactSyntheticEvent = {|
   dispatchConfig: DispatchConfig,
   getPooled: (
     dispatchConfig: DispatchConfig,
@@ -31,4 +31,4 @@ export type ReactSyntheticEvent = {
     nativeEventTarget: EventTarget,
   ) => ReactSyntheticEvent,
   isPersistent: () => boolean,
-} & SyntheticEvent<>;
+|} & SyntheticEvent<>;
diff --git a/packages/legacy-events/ResponderTouchHistoryStore.js b/packages/legacy-events/ResponderTouchHistoryStore.js
index 1706f9af17fa6..643e2c130a4e9 100644
--- a/packages/legacy-events/ResponderTouchHistoryStore.js
+++ b/packages/legacy-events/ResponderTouchHistoryStore.js
@@ -16,7 +16,7 @@ import {isStartish, isMoveish, isEndish} from './ResponderTopLevelEventTypes';
  * should typically only see IDs in the range of 1-20 because IDs get recycled
  * when touches end and start again.
  */
-type TouchRecord = {
+type TouchRecord = {|
   touchActive: boolean,
   startPageX: number,
   startPageY: number,
@@ -27,7 +27,7 @@ type TouchRecord = {
   previousPageX: number,
   previousPageY: number,
   previousTimeStamp: number,
-};
+|};
 
 const MAX_TOUCH_BANK = 20;
 const touchBank: Array<TouchRecord> = [];
@@ -46,10 +46,12 @@ type Touch = {
   pageX: number,
   pageY: number,
   timestamp: number,
+  ...
 };
 type TouchEvent = {
   changedTouches: Array<Touch>,
   touches: Array<Touch>,
+  ...
 };
 
 function timestampForTouch(touch: Touch): number {
diff --git a/packages/react-cache/src/ReactCache.js b/packages/react-cache/src/ReactCache.js
index 203e2c3395703..ec8d93d7cd85f 100644
--- a/packages/react-cache/src/ReactCache.js
+++ b/packages/react-cache/src/ReactCache.js
@@ -13,11 +13,10 @@ import {createLRU} from './LRU';
 
 type Thenable<T> = {
   then(resolve: (T) => mixed, reject: (mixed) => mixed): mixed,
+  ...
 };
 
-type Suspender = {
-  then(resolve: () => mixed, reject: () => mixed): mixed,
-};
+type Suspender = {then(resolve: () => mixed, reject: () => mixed): mixed, ...};
 
 type PendingResult = {|
   status: 0,
@@ -39,6 +38,7 @@ type Result<V> = PendingResult | ResolvedResult<V> | RejectedResult;
 type Resource<I, V> = {
   read(I): V,
   preload(I): void,
+  ...
 };
 
 const Pending = 0;
diff --git a/packages/react-debug-tools/src/ReactDebugHooks.js b/packages/react-debug-tools/src/ReactDebugHooks.js
index 0ff4d4278b170..26011eb8940df 100644
--- a/packages/react-debug-tools/src/ReactDebugHooks.js
+++ b/packages/react-debug-tools/src/ReactDebugHooks.js
@@ -36,6 +36,7 @@ type HookLogEntry = {
   primitive: string,
   stackError: Error,
   value: mixed,
+  ...
 };
 
 let hookLog: Array<HookLogEntry> = [];
@@ -142,7 +143,7 @@ function useReducer<S, I, A>(
   return [state, (action: A) => {}];
 }
 
-function useRef<T>(initialValue: T): {current: T} {
+function useRef<T>(initialValue: T): {|current: T|} {
   let hook = nextHook();
   let ref = hook !== null ? hook.memoizedState : {current: initialValue};
   hookLog.push({
@@ -174,7 +175,7 @@ function useEffect(
 }
 
 function useImperativeHandle<T>(
-  ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+  ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
   create: () => T,
   inputs: Array<mixed> | void | null,
 ): void {
@@ -285,6 +286,7 @@ export type HooksNode = {
   name: string,
   value: mixed,
   subHooks: Array<HooksNode>,
+  ...
 };
 export type HooksTree = Array<HooksNode>;
 
diff --git a/packages/react-devtools-core/src/backend.js b/packages/react-devtools-core/src/backend.js
index f90a68d0d2f17..6b95b4c79114a 100644
--- a/packages/react-devtools-core/src/backend.js
+++ b/packages/react-devtools-core/src/backend.js
@@ -27,6 +27,7 @@ type ConnectOptions = {
   resolveRNStyle?: ResolveNativeStyle,
   isAppActive?: () => boolean,
   websocket?: ?WebSocket,
+  ...
 };
 
 installHook(window);
@@ -120,7 +121,7 @@ export function connectToDevTools(options: ?ConnectOptions) {
     });
     bridge.addListener(
       'inspectElement',
-      ({id, rendererID}: {id: number, rendererID: number}) => {
+      ({id, rendererID}: {id: number, rendererID: number, ...}) => {
         const renderer = agent.rendererInterfaces[rendererID];
         if (renderer != null) {
           // Send event for RN to highlight.
diff --git a/packages/react-devtools-shared/src/backend/agent.js b/packages/react-devtools-shared/src/backend/agent.js
index 73c09f6a84239..b9a2b7ab0af23 100644
--- a/packages/react-devtools-shared/src/backend/agent.js
+++ b/packages/react-devtools-shared/src/backend/agent.js
@@ -109,7 +109,7 @@ export default class Agent extends EventEmitter<{|
   _bridge: BackendBridge;
   _isProfiling: boolean = false;
   _recordChangeDescriptions: boolean = false;
-  _rendererInterfaces: {[key: RendererID]: RendererInterface} = {};
+  _rendererInterfaces: {[key: RendererID]: RendererInterface, ...} = {};
   _persistedSelection: PersistedSelection | null = null;
   _persistedSelectionMatch: PathMatch | null = null;
   _traceUpdatesEnabled: boolean = false;
@@ -185,7 +185,7 @@ export default class Agent extends EventEmitter<{|
     setupTraceUpdates(this);
   }
 
-  get rendererInterfaces(): {[key: RendererID]: RendererInterface} {
+  get rendererInterfaces(): {[key: RendererID]: RendererInterface, ...} {
     return this._rendererInterfaces;
   }
 
diff --git a/packages/react-devtools-shared/src/backend/index.js b/packages/react-devtools-shared/src/backend/index.js
index 4af370046f073..6a70c250bb3cd 100644
--- a/packages/react-devtools-shared/src/backend/index.js
+++ b/packages/react-devtools-shared/src/backend/index.js
@@ -30,6 +30,7 @@ export function initBackend(
         id: number,
         renderer: ReactRenderer,
         rendererInterface: RendererInterface,
+        ...
       }) => {
         agent.setRendererInterface(id, rendererInterface);
 
@@ -91,7 +92,7 @@ export function initBackend(
   subs.push(
     hook.sub(
       'renderer',
-      ({id, renderer}: {id: number, renderer: ReactRenderer}) => {
+      ({id, renderer}: {id: number, renderer: ReactRenderer, ...}) => {
         attachRenderer(id, renderer);
       },
     ),
diff --git a/packages/react-devtools-shared/src/backend/legacy/utils.js b/packages/react-devtools-shared/src/backend/legacy/utils.js
index a2f7a440ed457..2634ab1edff58 100644
--- a/packages/react-devtools-shared/src/backend/legacy/utils.js
+++ b/packages/react-devtools-shared/src/backend/legacy/utils.js
@@ -19,7 +19,7 @@ export function decorate(object: Object, attr: string, fn: Function): Function {
 
 export function decorateMany(
   source: Object,
-  fns: {[attr: string]: Function},
+  fns: {[attr: string]: Function, ...},
 ): Object {
   const olds = {};
   for (const name in fns) {
diff --git a/packages/react-devtools-shared/src/backend/renderer.js b/packages/react-devtools-shared/src/backend/renderer.js
index db5d45e3f0eb4..7179cc5e43fd3 100644
--- a/packages/react-devtools-shared/src/backend/renderer.js
+++ b/packages/react-devtools-shared/src/backend/renderer.js
@@ -76,7 +76,7 @@ import type {
 type getDisplayNameForFiberType = (fiber: Fiber) => string | null;
 type getTypeSymbolType = (type: any) => Symbol | number;
 
-type ReactSymbolsType = {
+type ReactSymbolsType = {|
   CONCURRENT_MODE_NUMBER: number,
   CONCURRENT_MODE_SYMBOL_STRING: string,
   DEPRECATED_ASYNC_MODE_SYMBOL_STRING: string,
@@ -94,7 +94,7 @@ type ReactSymbolsType = {
   STRICT_MODE_SYMBOL_STRING: string,
   SCOPE_NUMBER: number,
   SCOPE_SYMBOL_STRING: string,
-};
+|};
 
 type ReactPriorityLevelsType = {|
   ImmediatePriority: number,
diff --git a/packages/react-devtools-shared/src/backend/types.js b/packages/react-devtools-shared/src/backend/types.js
index 8f738fbfe94cf..69c9bdeb130ed 100644
--- a/packages/react-devtools-shared/src/backend/types.js
+++ b/packages/react-devtools-shared/src/backend/types.js
@@ -48,13 +48,13 @@ export type FindNativeNodesForFiberID = (id: number) => ?Array<NativeType>;
 export type ReactProviderType<T> = {
   $$typeof: Symbol | number,
   _context: ReactContext<T>,
+  ...
 };
 
 export type ReactRenderer = {
   findFiberByHostInstance: (hostInstance: NativeType) => ?Fiber,
   version: string,
   bundleType: BundleType,
-
   // 16.9+
   overrideHookState?: ?(
     fiber: Object,
@@ -62,30 +62,25 @@ export type ReactRenderer = {
     path: Array<string | number>,
     value: any,
   ) => void,
-
   // 16.7+
   overrideProps?: ?(
     fiber: Object,
     path: Array<string | number>,
     value: any,
   ) => void,
-
   // 16.9+
   scheduleUpdate?: ?(fiber: Object) => void,
   setSuspenseHandler?: ?(shouldSuspend: (fiber: Object) => boolean) => void,
-
   // Only injected by React v16.8+ in order to support hooks inspection.
   currentDispatcherRef?: {|current: null | Dispatcher|},
-
   // Only injected by React v16.9+ in DEV mode.
   // Enables DevTools to append owners-only component stack to error messages.
   getCurrentFiber?: () => Fiber | null,
-
   // Uniquely identifies React DOM v15.
   ComponentTree?: any,
-
   // Present for React DOM v12 (possibly earlier) through v15.
   Mount?: any,
+  ...
 };
 
 export type ChangeDescription = {|
@@ -267,12 +262,13 @@ export type RendererInterface = {
     count: number,
   ) => void,
   updateComponentFilters: (componentFilters: Array<ComponentFilter>) => void,
+  ...
 };
 
 export type Handler = (data: any) => void;
 
 export type DevToolsHook = {
-  listeners: {[key: string]: Array<Handler>},
+  listeners: {[key: string]: Array<Handler>, ...},
   rendererInterfaces: Map<RendererID, RendererInterface>,
   renderers: Map<RendererID, ReactRenderer>,
 
@@ -299,4 +295,5 @@ export type DevToolsHook = {
     // Added in v16.9 to support Fast Refresh
     didError?: boolean,
   ) => void,
+  ...
 };
diff --git a/packages/react-devtools-shared/src/backend/views/Highlighter/index.js b/packages/react-devtools-shared/src/backend/views/Highlighter/index.js
index 720e74e239c07..bfd9c7c230337 100644
--- a/packages/react-devtools-shared/src/backend/views/Highlighter/index.js
+++ b/packages/react-devtools-shared/src/backend/views/Highlighter/index.js
@@ -95,6 +95,7 @@ export default function setupHighlighter(
     openNativeElementsPanel: boolean,
     rendererID: number,
     scrollIntoView: boolean,
+    ...
   }) {
     const renderer = agent.rendererInterfaces[rendererID];
     if (renderer == null) {
diff --git a/packages/react-devtools-shared/src/backend/views/utils.js b/packages/react-devtools-shared/src/backend/views/utils.js
index fa779a574d77c..e332c81a0af86 100644
--- a/packages/react-devtools-shared/src/backend/views/utils.js
+++ b/packages/react-devtools-shared/src/backend/views/utils.js
@@ -14,6 +14,7 @@ export type Rect = {
   right: number,
   top: number,
   width: number,
+  ...
 };
 
 // Get the window object for the document that a node belongs to,
diff --git a/packages/react-devtools-shared/src/devtools/cache.js b/packages/react-devtools-shared/src/devtools/cache.js
index 084c45f000444..e389a594e896e 100644
--- a/packages/react-devtools-shared/src/devtools/cache.js
+++ b/packages/react-devtools-shared/src/devtools/cache.js
@@ -21,11 +21,10 @@ import React, {createContext} from 'react';
 
 export type Thenable<T> = {
   then(resolve: (T) => mixed, reject: (mixed) => mixed): mixed,
+  ...
 };
 
-type Suspender = {
-  then(resolve: () => mixed, reject: () => mixed): mixed,
-};
+type Suspender = {then(resolve: () => mixed, reject: () => mixed): mixed, ...};
 
 type PendingResult = {|
   status: 0,
@@ -50,6 +49,7 @@ export type Resource<Input, Key, Value> = {
   read(Input): Value,
   preload(Input): void,
   write(Key, Value): void,
+  ...
 };
 
 const Pending = 0;
@@ -73,9 +73,7 @@ function readContext(Context, observedBits) {
 
 const CacheContext = createContext(null);
 
-type Config = {
-  useWeakMap?: boolean,
-};
+type Config = {useWeakMap?: boolean, ...};
 
 const entries: Map<
   Resource<any, any, any>,
diff --git a/packages/react-devtools-shared/src/devtools/views/Button.js b/packages/react-devtools-shared/src/devtools/views/Button.js
index 88787ead03867..76028d53dde90 100644
--- a/packages/react-devtools-shared/src/devtools/views/Button.js
+++ b/packages/react-devtools-shared/src/devtools/views/Button.js
@@ -17,6 +17,7 @@ type Props = {
   children: React$Node,
   className?: string,
   title?: string,
+  ...
 };
 
 export default function Button({
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/Element.js b/packages/react-devtools-shared/src/devtools/views/Components/Element.js
index 9f3aaed2d69b8..4143bd01ce7f6 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/Element.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/Element.js
@@ -24,6 +24,7 @@ type Props = {
   data: ItemData,
   index: number,
   style: Object,
+  ...
 };
 
 export default function ElementView({data, index, style}: Props) {
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/AutoSizeInput.js b/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/AutoSizeInput.js
index 03d6b47b51948..389013ee7d5a6 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/AutoSizeInput.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/NativeStyleEditor/AutoSizeInput.js
@@ -15,6 +15,7 @@ type Props = {
   onFocus?: (event: FocusEvent) => void,
   placeholder?: string,
   value: any,
+  ...
 };
 
 export default function AutoSizeInput({
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/OwnersStack.js b/packages/react-devtools-shared/src/devtools/views/Components/OwnersStack.js
index fa627299fb80e..a42ff9ada0d37 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/OwnersStack.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/OwnersStack.js
@@ -199,6 +199,7 @@ type ElementsDropdownProps = {
   owners: Array<Owner>,
   selectedIndex: number,
   selectOwner: SelectOwner,
+  ...
 };
 function ElementsDropdown({
   owners,
@@ -245,6 +246,7 @@ type ElementViewProps = {
   isSelected: boolean,
   owner: Owner,
   selectOwner: SelectOwner,
+  ...
 };
 function ElementView({isSelected, owner, selectOwner}: ElementViewProps) {
   const store = useContext(StoreContext);
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/Tree.js b/packages/react-devtools-shared/src/devtools/views/Components/Tree.js
index fe03d443ffac6..3b6357ae8535e 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/Tree.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/Tree.js
@@ -38,7 +38,7 @@ const DEFAULT_INDENTATION_SIZE = 12;
 export type ItemData = {|
   numElements: number,
   isNavigatingWithKeyboard: boolean,
-  lastScrolledIDRef: {current: number | null},
+  lastScrolledIDRef: {current: number | null, ...},
   onElementMouseEnter: (id: number) => void,
   treeFocused: boolean,
 |};
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/types.js b/packages/react-devtools-shared/src/devtools/views/Components/types.js
index 3ce717cef6ec7..6e57fec8adcad 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/types.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/types.js
@@ -99,6 +99,6 @@ export type DehydratedData = {|
     | Unserializable
     | Array<Dehydrated>
     | Array<Unserializable>
-    | {[key: string]: string | Dehydrated | Unserializable},
+    | {[key: string]: string | Dehydrated | Unserializable, ...},
   unserializable: Array<Array<string | number>>,
 |};
diff --git a/packages/react-devtools-shared/src/devtools/views/Profiler/CommitFlamegraphListItem.js b/packages/react-devtools-shared/src/devtools/views/Profiler/CommitFlamegraphListItem.js
index bcaa76b05376d..66d2db36962c4 100644
--- a/packages/react-devtools-shared/src/devtools/views/Profiler/CommitFlamegraphListItem.js
+++ b/packages/react-devtools-shared/src/devtools/views/Profiler/CommitFlamegraphListItem.js
@@ -20,6 +20,7 @@ type Props = {
   data: ItemData,
   index: number,
   style: Object,
+  ...
 };
 
 function CommitFlamegraphListItem({data, index, style}: Props) {
diff --git a/packages/react-devtools-shared/src/devtools/views/Profiler/CommitRankedListItem.js b/packages/react-devtools-shared/src/devtools/views/Profiler/CommitRankedListItem.js
index ba1edaa91f660..8c46e7de2730b 100644
--- a/packages/react-devtools-shared/src/devtools/views/Profiler/CommitRankedListItem.js
+++ b/packages/react-devtools-shared/src/devtools/views/Profiler/CommitRankedListItem.js
@@ -20,6 +20,7 @@ type Props = {
   data: ItemData,
   index: number,
   style: Object,
+  ...
 };
 
 function CommitRankedListItem({data, index, style}: Props) {
diff --git a/packages/react-devtools-shared/src/devtools/views/Profiler/InteractionListItem.js b/packages/react-devtools-shared/src/devtools/views/Profiler/InteractionListItem.js
index 3bc6bd1f4005b..cfc5d1229a9bc 100644
--- a/packages/react-devtools-shared/src/devtools/views/Profiler/InteractionListItem.js
+++ b/packages/react-devtools-shared/src/devtools/views/Profiler/InteractionListItem.js
@@ -19,6 +19,7 @@ type Props = {
   data: ItemData,
   index: number,
   style: Object,
+  ...
 };
 
 function InteractionListItem({data: itemData, index, style}: Props) {
diff --git a/packages/react-devtools-shared/src/devtools/views/Profiler/SnapshotCommitListItem.js b/packages/react-devtools-shared/src/devtools/views/Profiler/SnapshotCommitListItem.js
index 07e08efd8b6dd..feb69c8f7c84a 100644
--- a/packages/react-devtools-shared/src/devtools/views/Profiler/SnapshotCommitListItem.js
+++ b/packages/react-devtools-shared/src/devtools/views/Profiler/SnapshotCommitListItem.js
@@ -19,6 +19,7 @@ type Props = {
   data: ItemData,
   index: number,
   style: Object,
+  ...
 };
 
 function SnapshotCommitListItem({data: itemData, index, style}: Props) {
diff --git a/packages/react-devtools-shared/src/devtools/views/Settings/SettingsModalContext.js b/packages/react-devtools-shared/src/devtools/views/Settings/SettingsModalContext.js
index 718656f5788e9..694e859808730 100644
--- a/packages/react-devtools-shared/src/devtools/views/Settings/SettingsModalContext.js
+++ b/packages/react-devtools-shared/src/devtools/views/Settings/SettingsModalContext.js
@@ -15,6 +15,7 @@ export type Theme = 'auto' | 'light' | 'dark';
 type Context = {
   isModalShowing: boolean,
   setIsModalShowing: (value: boolean) => void,
+  ...
 };
 
 const SettingsModalContext = createContext<Context>(((null: any): Context));
diff --git a/packages/react-devtools-shared/src/devtools/views/Toggle.js b/packages/react-devtools-shared/src/devtools/views/Toggle.js
index 41b33dd70387a..1eaaa73738905 100644
--- a/packages/react-devtools-shared/src/devtools/views/Toggle.js
+++ b/packages/react-devtools-shared/src/devtools/views/Toggle.js
@@ -20,6 +20,7 @@ type Props = {
   isDisabled?: boolean,
   onChange: (isChecked: boolean) => void,
   title?: string,
+  ...
 };
 
 export default function Toggle({
diff --git a/packages/react-devtools-shared/src/devtools/views/hooks.js b/packages/react-devtools-shared/src/devtools/views/hooks.js
index 62cafbfed316f..a8fb43dd61a12 100644
--- a/packages/react-devtools-shared/src/devtools/views/hooks.js
+++ b/packages/react-devtools-shared/src/devtools/views/hooks.js
@@ -106,7 +106,7 @@ export function useEditableValue(
 }
 
 export function useIsOverflowing(
-  containerRef: {current: HTMLDivElement | null},
+  containerRef: {current: HTMLDivElement | null, ...},
   totalChildWidth: number,
 ): boolean {
   const [isOverflowing, setIsOverflowing] = useState<boolean>(false);
@@ -195,7 +195,7 @@ export function useLocalStorage<T>(
 }
 
 export function useModalDismissSignal(
-  modalRef: {current: HTMLDivElement | null},
+  modalRef: {current: HTMLDivElement | null, ...},
   dismissCallback: () => void,
   dismissOnClickOutside?: boolean = true,
 ): void {
diff --git a/packages/react-devtools-shared/src/devtools/views/portaledContent.js b/packages/react-devtools-shared/src/devtools/views/portaledContent.js
index 32cff8504af6e..cf312787f5ea7 100644
--- a/packages/react-devtools-shared/src/devtools/views/portaledContent.js
+++ b/packages/react-devtools-shared/src/devtools/views/portaledContent.js
@@ -11,9 +11,7 @@ import React from 'react';
 import {createPortal} from 'react-dom';
 import ErrorBoundary from './ErrorBoundary';
 
-export type Props = {
-  portalContainer?: Element,
-};
+export type Props = {portalContainer?: Element, ...};
 
 export default function portaledContent(
   Component: React$StatelessFunctionalComponent<any>,
diff --git a/packages/react-devtools-shared/src/hydration.js b/packages/react-devtools-shared/src/hydration.js
index 5e00b1b619e6e..01e0432d2a5d3 100644
--- a/packages/react-devtools-shared/src/hydration.js
+++ b/packages/react-devtools-shared/src/hydration.js
@@ -52,6 +52,7 @@ export type Unserializable = {
   size?: number,
   type: string,
   unserializable: boolean,
+  ...
 };
 
 // This threshold determines the depth at which the bridge "dehydrates" nested data.
@@ -129,7 +130,7 @@ export function dehydrate(
   | Unserializable
   | Array<Dehydrated>
   | Array<Unserializable>
-  | {[key: string]: string | Dehydrated | Unserializable} {
+  | {[key: string]: string | Dehydrated | Unserializable, ...} {
   const type = getDataType(data);
 
   let isPathWhitelistedCheck;
@@ -375,7 +376,7 @@ export function hydrate(
       parent[last] = undefined;
     } else {
       // Replace the string keys with Symbols so they're non-enumerable.
-      const replaced: {[key: Symbol]: boolean | string} = {};
+      const replaced: {[key: Symbol]: boolean | string, ...} = {};
       replaced[meta.inspectable] = !!value.inspectable;
       replaced[meta.inspected] = false;
       replaced[meta.name] = value.name;
diff --git a/packages/react-dom/src/client/ReactDOM.js b/packages/react-dom/src/client/ReactDOM.js
index 818d0eef3a94f..079d3432ef2bc 100644
--- a/packages/react-dom/src/client/ReactDOM.js
+++ b/packages/react-dom/src/client/ReactDOM.js
@@ -106,12 +106,8 @@ setBatchingImplementation(
 );
 
 export type DOMContainer =
-  | (Element & {
-      _reactRootContainer: ?RootType,
-    })
-  | (Document & {
-      _reactRootContainer: ?RootType,
-    });
+  | (Element & {_reactRootContainer: ?RootType, ...})
+  | (Document & {_reactRootContainer: ?RootType, ...});
 
 function createPortal(
   children: ReactNodeList,
diff --git a/packages/react-dom/src/client/ReactDOMHostConfig.js b/packages/react-dom/src/client/ReactDOMHostConfig.js
index 96498935a5a0d..e055b6b983766 100644
--- a/packages/react-dom/src/client/ReactDOMHostConfig.js
+++ b/packages/react-dom/src/client/ReactDOMHostConfig.js
@@ -65,13 +65,12 @@ export type Props = {
   hidden?: boolean,
   suppressHydrationWarning?: boolean,
   dangerouslySetInnerHTML?: mixed,
-  style?: {
-    display?: string,
-  },
+  style?: {display?: string, ...},
   bottom?: null | number,
   left?: null | number,
   right?: null | number,
   top?: null | number,
+  ...
 };
 export type EventTargetChildElement = {
   type: string,
@@ -83,18 +82,22 @@ export type EventTargetChildElement = {
       left?: string,
       right?: string,
       top?: string,
+      ...
     },
+    ...
   },
+  ...
 };
 export type Container = Element | Document;
 export type Instance = Element;
 export type TextInstance = Text;
-export type SuspenseInstance = Comment & {_reactRetry?: () => void};
+export type SuspenseInstance = Comment & {_reactRetry?: () => void, ...};
 export type HydratableInstance = Instance | TextInstance | SuspenseInstance;
 export type PublicInstance = Element | Text;
 type HostContextDev = {
   namespace: string,
   ancestorInfo: mixed,
+  ...
 };
 type HostContextProd = string;
 export type HostContext = HostContextDev | HostContextProd;
diff --git a/packages/react-dom/src/client/ReactDOMInput.js b/packages/react-dom/src/client/ReactDOMInput.js
index 0f5d61b8dc426..884c2ad9dfe2f 100644
--- a/packages/react-dom/src/client/ReactDOMInput.js
+++ b/packages/react-dom/src/client/ReactDOMInput.js
@@ -25,7 +25,9 @@ type InputWithWrapperState = HTMLInputElement & {
     initialValue: ToStringValue,
     initialChecked: ?boolean,
     controlled?: boolean,
+    ...
   },
+  ...
 };
 
 let didWarnValueDefaultValue = false;
@@ -178,10 +180,10 @@ export function updateWrapper(element: Element, props: Object) {
         // eslint-disable-next-line
         node.value != (value: any)
       ) {
-        node.value = toString(value);
+        node.value = toString((value: any));
       }
-    } else if (node.value !== toString(value)) {
-      node.value = toString(value);
+    } else if (node.value !== toString((value: any))) {
+      node.value = toString((value: any));
     }
   } else if (type === 'submit' || type === 'reset') {
     // Submit/reset inputs need the attribute removed completely to avoid
diff --git a/packages/react-dom/src/client/ReactDOMRoot.js b/packages/react-dom/src/client/ReactDOMRoot.js
index 4719b1fe2d38c..b11430b8b3c0f 100644
--- a/packages/react-dom/src/client/ReactDOMRoot.js
+++ b/packages/react-dom/src/client/ReactDOMRoot.js
@@ -17,8 +17,8 @@ import type {FiberRoot} from 'react-reconciler/src/ReactFiberRoot';
 export type RootType = {
   render(children: ReactNodeList, callback: ?() => mixed): void,
   unmount(callback: ?() => mixed): void,
-
   _internalRoot: FiberRoot,
+  ...
 };
 
 export type RootOptions = {
@@ -26,7 +26,9 @@ export type RootOptions = {
   hydrationOptions?: {
     onHydrated?: (suspenseNode: Comment) => void,
     onDeleted?: (suspenseNode: Comment) => void,
+    ...
   },
+  ...
 };
 
 import {
diff --git a/packages/react-dom/src/client/ReactDOMSelect.js b/packages/react-dom/src/client/ReactDOMSelect.js
index a2add6896fc98..725159685428d 100644
--- a/packages/react-dom/src/client/ReactDOMSelect.js
+++ b/packages/react-dom/src/client/ReactDOMSelect.js
@@ -19,11 +19,9 @@ if (__DEV__) {
   didWarnValueDefaultValue = false;
 }
 
-type SelectWithWrapperState = HTMLSelectElement & {
-  _wrapperState: {
-    wasMultiple: boolean,
-  },
-};
+type SelectWithWrapperState = HTMLSelectElement & {|
+  _wrapperState: {|wasMultiple: boolean|},
+|};
 
 function getDeclarationErrorAddendum() {
   const ownerName = getCurrentFiberOwnerNameInDevOrNull();
@@ -75,6 +73,7 @@ function updateOptions(
 ) {
   type IndexableHTMLOptionsCollection = HTMLOptionsCollection & {
     [key: number]: HTMLOptionElement,
+    ...,
   };
   const options: IndexableHTMLOptionsCollection = node.options;
 
diff --git a/packages/react-dom/src/client/ReactDOMTextarea.js b/packages/react-dom/src/client/ReactDOMTextarea.js
index 01c855d902b6e..dc436d1b552d7 100644
--- a/packages/react-dom/src/client/ReactDOMTextarea.js
+++ b/packages/react-dom/src/client/ReactDOMTextarea.js
@@ -16,11 +16,9 @@ import type {ToStringValue} from './ToStringValue';
 
 let didWarnValDefaultVal = false;
 
-type TextAreaWithWrapperState = HTMLTextAreaElement & {
-  _wrapperState: {
-    initialValue: ToStringValue,
-  },
-};
+type TextAreaWithWrapperState = HTMLTextAreaElement & {|
+  _wrapperState: {|initialValue: ToStringValue|},
+|};
 
 /**
  * Implements a <textarea> host component that allows setting `value`, and
diff --git a/packages/react-dom/src/client/inputValueTracking.js b/packages/react-dom/src/client/inputValueTracking.js
index 5bf48ef2ae015..54c850662ab2b 100644
--- a/packages/react-dom/src/client/inputValueTracking.js
+++ b/packages/react-dom/src/client/inputValueTracking.js
@@ -7,12 +7,12 @@
  * @flow
  */
 
-type ValueTracker = {
+type ValueTracker = {|
   getValue(): string,
   setValue(value: string): void,
   stopTracking(): void,
-};
-type WrapperState = {_valueTracker?: ?ValueTracker};
+|};
+type WrapperState = {_valueTracker?: ?ValueTracker, ...};
 type ElementWithValueTracker = HTMLInputElement & WrapperState;
 
 function isCheckable(elem: HTMLInputElement) {
diff --git a/packages/react-dom/src/client/setInnerHTML.js b/packages/react-dom/src/client/setInnerHTML.js
index 8c772d2de5fcf..7afcd9a6306b4 100644
--- a/packages/react-dom/src/client/setInnerHTML.js
+++ b/packages/react-dom/src/client/setInnerHTML.js
@@ -23,7 +23,7 @@ let reusableSVGContainer;
  */
 const setInnerHTML = createMicrosoftUnsafeLocalFunction(function(
   node: Element,
-  html: {valueOf(): {toString(): string}},
+  html: {valueOf(): {toString(): string, ...}, ...},
 ): void {
   if (node.namespaceURI === Namespaces.svg) {
     if (__DEV__) {
diff --git a/packages/react-dom/src/events/ReactBrowserEventEmitter.js b/packages/react-dom/src/events/ReactBrowserEventEmitter.js
index 946034f5d0f61..16cd407cba787 100644
--- a/packages/react-dom/src/events/ReactBrowserEventEmitter.js
+++ b/packages/react-dom/src/events/ReactBrowserEventEmitter.js
@@ -86,7 +86,9 @@ import isEventSupported from './isEventSupported';
  */
 
 const PossiblyWeakMap = typeof WeakMap === 'function' ? WeakMap : Map;
+// prettier-ignore
 const elementListenerMap:
+  // $FlowFixMe Work around Flow bug
   | WeakMap
   | Map<
       Document | Element | Node,
diff --git a/packages/react-dom/src/events/ReactDOMEventReplaying.js b/packages/react-dom/src/events/ReactDOMEventReplaying.js
index 4f94f903ea875..78c742a301cd4 100644
--- a/packages/react-dom/src/events/ReactDOMEventReplaying.js
+++ b/packages/react-dom/src/events/ReactDOMEventReplaying.js
@@ -74,6 +74,7 @@ export function setAttemptHydrationAtCurrentPriority(
 type PointerEvent = Event & {
   pointerId: number,
   relatedTarget: EventTarget | null,
+  ...
 };
 
 import {
diff --git a/packages/react-dom/src/server/ReactPartialRenderer.js b/packages/react-dom/src/server/ReactPartialRenderer.js
index 80047d06eba72..ecee219346a6a 100644
--- a/packages/react-dom/src/server/ReactPartialRenderer.js
+++ b/packages/react-dom/src/server/ReactPartialRenderer.js
@@ -701,11 +701,10 @@ type Frame = {
   childIndex: number,
   context: Object,
   footer: string,
+  ...
 };
 
-type FrameDev = Frame & {
-  debugElementStack: Array<ReactElement>,
-};
+type FrameDev = Frame & {|debugElementStack: Array<ReactElement>|};
 
 class ReactDOMServerRenderer {
   threadID: ThreadID;
@@ -1578,7 +1577,10 @@ class ReactDOMServerRenderer {
     const innerMarkup = getNonChildrenInnerMarkup(props);
     if (innerMarkup != null) {
       children = [];
-      if (newlineEatingTags[tag] && innerMarkup.charAt(0) === '\n') {
+      if (
+        newlineEatingTags.hasOwnProperty(tag) &&
+        innerMarkup.charAt(0) === '\n'
+      ) {
         // text/html ignores the first character in these tags if it's a newline
         // Prefer to break application/xml over text/html (for now) by adding
         // a newline specifically to get eaten by the parser. (Alternately for
diff --git a/packages/react-dom/src/server/ReactPartialRendererHooks.js b/packages/react-dom/src/server/ReactPartialRendererHooks.js
index bcdc14397b2a0..b8df948461ad6 100644
--- a/packages/react-dom/src/server/ReactPartialRendererHooks.js
+++ b/packages/react-dom/src/server/ReactPartialRendererHooks.js
@@ -25,21 +25,21 @@ import is from 'shared/objectIs';
 type BasicStateAction<S> = (S => S) | S;
 type Dispatch<A> = A => void;
 
-type Update<A> = {
+type Update<A> = {|
   action: A,
   next: Update<A> | null,
-};
+|};
 
-type UpdateQueue<A> = {
+type UpdateQueue<A> = {|
   last: Update<A> | null,
   dispatch: any,
-};
+|};
 
-type Hook = {
+type Hook = {|
   memoizedState: any,
   queue: UpdateQueue<any> | null,
   next: Hook | null,
-};
+|};
 
 let currentlyRenderingComponent: Object | null = null;
 let firstWorkInProgressHook: Hook | null = null;
@@ -369,7 +369,7 @@ function useMemo<T>(nextCreate: () => T, deps: Array<mixed> | void | null): T {
   return nextValue;
 }
 
-function useRef<T>(initialValue: T): {current: T} {
+function useRef<T>(initialValue: T): {|current: T|} {
   currentlyRenderingComponent = resolveCurrentlyRenderingComponent();
   workInProgressHook = createWorkInProgressHook();
   const previousRef = workInProgressHook.memoizedState;
diff --git a/packages/react-dom/src/shared/sanitizeURL.js b/packages/react-dom/src/shared/sanitizeURL.js
index a34ba87bbbcf9..e84c0de737742 100644
--- a/packages/react-dom/src/shared/sanitizeURL.js
+++ b/packages/react-dom/src/shared/sanitizeURL.js
@@ -11,7 +11,7 @@ import invariant from 'shared/invariant';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 import {disableJavaScriptURLs} from 'shared/ReactFeatureFlags';
 
-let ReactDebugCurrentFrame = ((null: any): {getStackAddendum(): string});
+let ReactDebugCurrentFrame = ((null: any): {getStackAddendum(): string, ...});
 if (__DEV__) {
   ReactDebugCurrentFrame = ReactSharedInternals.ReactDebugCurrentFrame;
 }
diff --git a/packages/react-flight/src/ReactFlightClient.js b/packages/react-flight/src/ReactFlightClient.js
index fa1622677768e..3adab738369df 100644
--- a/packages/react-flight/src/ReactFlightClient.js
+++ b/packages/react-flight/src/ReactFlightClient.js
@@ -20,7 +20,12 @@ export type ReactModelRoot<T> = {|
   model: T,
 |};
 
-type JSONValue = number | null | boolean | string | {[key: string]: JSONValue};
+type JSONValue =
+  | number
+  | null
+  | boolean
+  | string
+  | {[key: string]: JSONValue, ...};
 
 const PENDING = 0;
 const RESOLVED = 1;
@@ -49,10 +54,12 @@ type OpaqueResponseWithoutDecoder = {
   modelRoot: ReactModelRoot<any>,
   chunks: Map<number, Chunk>,
   fromJSON: (key: string, value: JSONValue) => any,
+  ...
 };
 
 type OpaqueResponse = OpaqueResponseWithoutDecoder & {
   stringDecoder: StringDecoder,
+  ...
 };
 
 export function createResponse(source: Source): OpaqueResponse {
diff --git a/packages/react-interactions/accessibility/src/FocusGroup.js b/packages/react-interactions/accessibility/src/FocusGroup.js
index c23d487ce93fe..ad677b9d6a111 100644
--- a/packages/react-interactions/accessibility/src/FocusGroup.js
+++ b/packages/react-interactions/accessibility/src/FocusGroup.js
@@ -17,6 +17,7 @@ import setElementCanTab from './shared/setElementCanTab';
 type FocusItemProps = {
   children?: React.Node,
   onKeyDown?: KeyboardEvent => void,
+  ...
 };
 
 type FocusGroupProps = {|
diff --git a/packages/react-interactions/accessibility/src/FocusTable.js b/packages/react-interactions/accessibility/src/FocusTable.js
index 32696ed45c0d3..aea24b80ed1ab 100644
--- a/packages/react-interactions/accessibility/src/FocusTable.js
+++ b/packages/react-interactions/accessibility/src/FocusTable.js
@@ -18,11 +18,10 @@ type FocusCellProps = {
   children?: React.Node,
   onKeyDown?: KeyboardEvent => void,
   colSpan?: number,
+  ...
 };
 
-type FocusRowProps = {
-  children: React.Node,
-};
+type FocusRowProps = {children: React.Node, ...};
 
 type FocusTableProps = {|
   children: React.Node,
diff --git a/packages/react-interactions/events/src/dom/ContextMenu.js b/packages/react-interactions/events/src/dom/ContextMenu.js
index 7a1b05e8a99e6..1861eef1a624a 100644
--- a/packages/react-interactions/events/src/dom/ContextMenu.js
+++ b/packages/react-interactions/events/src/dom/ContextMenu.js
@@ -23,9 +23,7 @@ type ContextMenuProps = {|
   preventDefault: boolean,
 |};
 
-type ContextMenuState = {
-  pointerType: PointerType,
-};
+type ContextMenuState = {pointerType: PointerType, ...};
 
 type ContextMenuEvent = {|
   altKey: boolean,
diff --git a/packages/react-interactions/events/src/dom/Drag.js b/packages/react-interactions/events/src/dom/Drag.js
index 00de45d2e9d03..82779eac5ef19 100644
--- a/packages/react-interactions/events/src/dom/Drag.js
+++ b/packages/react-interactions/events/src/dom/Drag.js
@@ -29,6 +29,7 @@ type DragProps = {
   onDragMove: (e: DragEvent) => void,
   onDragEnd: (e: DragEvent) => void,
   onDragChange: boolean => void,
+  ...
 };
 
 type DragState = {|
@@ -57,6 +58,7 @@ if (typeof window !== 'undefined' && window.PointerEvent === undefined) {
 type EventData = {
   diffX: number,
   diffY: number,
+  ...
 };
 type DragEventType = 'dragstart' | 'dragend' | 'dragchange' | 'dragmove';
 
diff --git a/packages/react-interactions/events/src/dom/Focus.js b/packages/react-interactions/events/src/dom/Focus.js
index 436022010c354..b8572e5880ffa 100644
--- a/packages/react-interactions/events/src/dom/Focus.js
+++ b/packages/react-interactions/events/src/dom/Focus.js
@@ -36,6 +36,7 @@ type FocusState = {
   isFocused: boolean,
   isFocusVisible: boolean,
   pointerType: PointerType,
+  ...
 };
 
 type FocusProps = {
@@ -44,6 +45,7 @@ type FocusProps = {
   onFocus: (e: FocusEvent) => void,
   onFocusChange: boolean => void,
   onFocusVisibleChange: boolean => void,
+  ...
 };
 
 type FocusEventType = 'focus' | 'blur' | 'focuschange' | 'focusvisiblechange';
@@ -55,6 +57,7 @@ type FocusWithinProps = {
   onBlurWithin?: (e: FocusEvent) => void,
   onFocusWithinChange?: boolean => void,
   onFocusWithinVisibleChange?: boolean => void,
+  ...
 };
 
 type FocusWithinEventType =
diff --git a/packages/react-interactions/events/src/dom/Hover.js b/packages/react-interactions/events/src/dom/Hover.js
index c64c0e6182e75..503ee787ec253 100644
--- a/packages/react-interactions/events/src/dom/Hover.js
+++ b/packages/react-interactions/events/src/dom/Hover.js
@@ -24,6 +24,7 @@ type HoverProps = {
   onHoverEnd: (e: HoverEvent) => void,
   onHoverMove: (e: HoverEvent) => void,
   onHoverStart: (e: HoverEvent) => void,
+  ...
 };
 
 type HoverState = {
@@ -32,6 +33,7 @@ type HoverState = {
   isHovered: boolean,
   isTouched?: boolean,
   ignoreEmulatedMouseEvents?: boolean,
+  ...
 };
 
 type HoverEventType = 'hoverstart' | 'hoverend' | 'hoverchange' | 'hovermove';
diff --git a/packages/react-interactions/events/src/dom/Input.js b/packages/react-interactions/events/src/dom/Input.js
index 3aedc98fd38a7..ba4c6f5f7d52d 100644
--- a/packages/react-interactions/events/src/dom/Input.js
+++ b/packages/react-interactions/events/src/dom/Input.js
@@ -23,6 +23,7 @@ type InputResponderProps = {
   onBeforeChange: (e: InputEvent) => void,
   onChange: (e: InputEvent) => void,
   onValueChange: (value: string | boolean) => void,
+  ...
 };
 
 type InputEvent = {|
diff --git a/packages/react-interactions/events/src/dom/PressLegacy.js b/packages/react-interactions/events/src/dom/PressLegacy.js
index 1c09789ef72bf..ac19d3900a0cb 100644
--- a/packages/react-interactions/events/src/dom/PressLegacy.js
+++ b/packages/react-interactions/events/src/dom/PressLegacy.js
@@ -27,6 +27,7 @@ type PressProps = {|
     right: number,
     bottom: number,
     left: number,
+    ...
   },
   preventDefault: boolean,
   onPress: (e: PressEvent) => void,
@@ -65,6 +66,7 @@ type PressState = {
   activePointerId: null | number,
   shouldPreventClick: boolean,
   touchEvent: null | Touch,
+  ...
 };
 
 type PressEventType =
diff --git a/packages/react-interactions/events/src/dom/Scroll.js b/packages/react-interactions/events/src/dom/Scroll.js
index 8ae2f709dfe84..e1fe82646d0c1 100644
--- a/packages/react-interactions/events/src/dom/Scroll.js
+++ b/packages/react-interactions/events/src/dom/Scroll.js
@@ -25,6 +25,7 @@ type ScrollProps = {
   onScroll: ScrollEvent => void,
   onScrollDragStart: ScrollEvent => void,
   onScrollDragEnd: ScrollEvent => void,
+  ...
 };
 
 type ScrollState = {
@@ -35,6 +36,7 @@ type ScrollState = {
   isTouching: boolean,
   scrollLeft: number,
   scrollTop: number,
+  ...
 };
 
 type ScrollEventType =
diff --git a/packages/react-interactions/events/src/dom/Swipe.js b/packages/react-interactions/events/src/dom/Swipe.js
index 2cb7e29035062..74f0b3cb768c0 100644
--- a/packages/react-interactions/events/src/dom/Swipe.js
+++ b/packages/react-interactions/events/src/dom/Swipe.js
@@ -26,6 +26,7 @@ type SwipeProps = {
   onSwipeEnd: (e: SwipeEvent) => void,
   onSwipeLeft: (e: SwipeEvent) => void,
   onSwipeRight: (e: SwipeEvent) => void,
+  ...
 };
 
 const targetEventTypes = ['pointerdown'];
@@ -47,6 +48,7 @@ if (typeof window !== 'undefined' && window.PointerEvent === undefined) {
 type EventData = {
   diffX: number,
   diffY: number,
+  ...
 };
 type SwipeEventType = 'swipeleft' | 'swiperight' | 'swipeend' | 'swipemove';
 
@@ -101,6 +103,7 @@ type SwipeState = {
   swipeTarget: null | Element | Document,
   x: number,
   y: number,
+  ...
 };
 
 const swipeResponderImpl = {
diff --git a/packages/react-native-renderer/src/ReactFabricHostConfig.js b/packages/react-native-renderer/src/ReactFabricHostConfig.js
index 2badfedd63e86..da50bebe7b9b0 100644
--- a/packages/react-native-renderer/src/ReactFabricHostConfig.js
+++ b/packages/react-native-renderer/src/ReactFabricHostConfig.js
@@ -59,10 +59,9 @@ export type Props = Object;
 export type Instance = {
   node: Node,
   canonical: ReactFabricHostComponent,
+  ...
 };
-export type TextInstance = {
-  node: Node,
-};
+export type TextInstance = {node: Node, ...};
 export type HydratableInstance = Instance | TextInstance;
 export type PublicInstance = ReactFabricHostComponent;
 export type Container = number;
diff --git a/packages/react-native-renderer/src/ReactNativeHostConfig.js b/packages/react-native-renderer/src/ReactNativeHostConfig.js
index 1871c48786aab..e97aa961f0c73 100644
--- a/packages/react-native-renderer/src/ReactNativeHostConfig.js
+++ b/packages/react-native-renderer/src/ReactNativeHostConfig.js
@@ -35,6 +35,7 @@ export type Instance = {
   _children: Array<Instance | number>,
   _nativeTag: number,
   viewConfig: ReactNativeBaseComponentViewConfig<>,
+  ...
 };
 export type TextInstance = number;
 export type HydratableInstance = Instance | TextInstance;
diff --git a/packages/react-native-renderer/src/ReactNativeTypes.js b/packages/react-native-renderer/src/ReactNativeTypes.js
index fbf9e05485555..b062d06564090 100644
--- a/packages/react-native-renderer/src/ReactNativeTypes.js
+++ b/packages/react-native-renderer/src/ReactNativeTypes.js
@@ -45,9 +45,8 @@ export type AttributeConfiguration<
   TStyleProps = string,
 > = $ReadOnly<{
   [propName: TProps]: AttributeType,
-  style: $ReadOnly<{
-    [propName: TStyleProps]: AttributeType,
-  }>,
+  style: $ReadOnly<{[propName: TStyleProps]: AttributeType, ...}>,
+  ...
 }>;
 
 export type ReactNativeBaseComponentViewConfig<
@@ -62,18 +61,16 @@ export type ReactNativeBaseComponentViewConfig<
         bubbled: string,
       |}>,
     |}>,
+    ...,
   }>,
-  Commands?: $ReadOnly<{
-    [commandName: string]: number,
-  }>,
+  Commands?: $ReadOnly<{[commandName: string]: number, ...}>,
   directEventTypes?: $ReadOnly<{
     [eventName: string]: $ReadOnly<{|
       registrationName: string,
     |}>,
+    ...,
   }>,
-  NativeProps?: $ReadOnly<{
-    [propName: string]: string,
-  }>,
+  NativeProps?: $ReadOnly<{[propName: string]: string, ...}>,
   uiViewClassName: string,
   validAttributes: AttributeConfiguration<TProps, TStyleProps>,
 |}>;
@@ -116,6 +113,7 @@ export type NativeMethods = {
     onFail?: () => void,
   ): void,
   setNativeProps(nativeProps: Object): void,
+  ...
 };
 
 export type NativeMethodsMixinType = NativeMethods;
@@ -126,10 +124,12 @@ type SecretInternalsType = {
   computeComponentStackForErrorReporting(tag: number): string,
   // TODO (bvaughn) Decide which additional types to expose here?
   // And how much information to fill in for the above types.
+  ...
 };
 
 type SecretInternalsFabricType = {
   NativeMethodsMixin: NativeMethodsMixinType,
+  ...
 };
 
 /**
@@ -137,7 +137,7 @@ type SecretInternalsFabricType = {
  * Provide minimal Flow typing for the high-level RN API and call it a day.
  */
 export type ReactNativeType = {
-  NativeComponent: typeof ReactNativeComponent,
+  NativeComponent: _InternalReactNativeComponentClass<{...}>,
   findHostInstance_DEPRECATED(
     componentOrHandle: any,
   ): ?ElementRef<HostComponent<mixed>>,
@@ -150,13 +150,14 @@ export type ReactNativeType = {
   ): any,
   unmountComponentAtNode(containerTag: number): any,
   unmountComponentAtNodeAndRemoveContainer(containerTag: number): any,
-  unstable_batchedUpdates: any, // TODO (bvaughn) Add types
-
+  // TODO (bvaughn) Add types
+  unstable_batchedUpdates: any,
   __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED: SecretInternalsType,
+  ...
 };
 
 export type ReactFabricType = {
-  NativeComponent: typeof ReactNativeComponent,
+  NativeComponent: _InternalReactNativeComponentClass<{...}>,
   findHostInstance_DEPRECATED(componentOrHandle: any): ?HostComponent<mixed>,
   findNodeHandle(componentOrHandle: any): ?number,
   dispatchCommand(handle: any, command: string, args: Array<any>): void,
@@ -167,6 +168,7 @@ export type ReactFabricType = {
   ): any,
   unmountComponentAtNode(containerTag: number): any,
   __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED: SecretInternalsFabricType,
+  ...
 };
 
 export type ReactNativeEventTarget = {
@@ -176,7 +178,9 @@ export type ReactNativeEventTarget = {
     viewConfig: ReactNativeBaseComponentViewConfig<>,
     currentProps: Object,
     _internalInstanceHandle: Object,
+    ...
   },
+  ...
 };
 
 export type ReactFaricEventTouch = {
@@ -190,6 +194,7 @@ export type ReactFaricEventTouch = {
   target: number,
   timestamp: number,
   force: number,
+  ...
 };
 
 export type ReactFaricEvent = {
@@ -197,4 +202,5 @@ export type ReactFaricEvent = {
   changedTouches: Array<ReactFaricEventTouch>,
   targetTouches: Array<ReactFaricEventTouch>,
   target: number,
+  ...
 };
diff --git a/packages/react-noop-renderer/src/createReactNoop.js b/packages/react-noop-renderer/src/createReactNoop.js
index 7ed7db81ee8f6..58cc128685d5e 100644
--- a/packages/react-noop-renderer/src/createReactNoop.js
+++ b/packages/react-noop-renderer/src/createReactNoop.js
@@ -31,6 +31,7 @@ type Container = {
   rootID: string,
   children: Array<Instance | TextInstance>,
   pendingChildren: Array<Instance | TextInstance>,
+  ...
 };
 type Props = {
   prop: any,
@@ -40,6 +41,7 @@ type Props = {
   left?: null | number,
   right?: null | number,
   top?: null | number,
+  ...
 };
 type Instance = {|
   type: string,
@@ -315,7 +317,7 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
       type: string,
       oldProps: Props,
       newProps: Props,
-    ): null | {} {
+    ): null | {...} {
       if (type === 'errorInCompletePhase') {
         throw new Error('Error in host config.');
       }
diff --git a/packages/react-reconciler/src/ReactCapturedValue.js b/packages/react-reconciler/src/ReactCapturedValue.js
index 90a78ceaca325..726a22c976d56 100644
--- a/packages/react-reconciler/src/ReactCapturedValue.js
+++ b/packages/react-reconciler/src/ReactCapturedValue.js
@@ -11,13 +11,13 @@ import type {Fiber} from './ReactFiber';
 
 import {getStackByFiberInDevAndProd} from './ReactCurrentFiber';
 
-export type CapturedValue<T> = {
+export type CapturedValue<T> = {|
   value: T,
   source: Fiber | null,
   stack: string | null,
-};
+|};
 
-export type CapturedError = {
+export type CapturedError = {|
   componentName: ?string,
   componentStack: string,
   error: mixed,
@@ -25,7 +25,7 @@ export type CapturedError = {
   errorBoundaryFound: boolean,
   errorBoundaryName: string | null,
   willRetry: boolean,
-};
+|};
 
 export function createCapturedValue<T>(
   value: T,
diff --git a/packages/react-reconciler/src/ReactFiber.js b/packages/react-reconciler/src/ReactFiber.js
index 4bc5405e0ac39..792cd1def4db5 100644
--- a/packages/react-reconciler/src/ReactFiber.js
+++ b/packages/react-reconciler/src/ReactFiber.js
@@ -120,6 +120,7 @@ export type Dependencies = {
     ReactEventResponder<any, any>,
     ReactEventResponderInstance<any, any>,
   > | null,
+  ...
 };
 
 // A Fiber is work on a Component that needs to be done or was done. There can
@@ -170,7 +171,10 @@ export type Fiber = {|
 
   // The ref last used to attach this node.
   // I'll avoid adding an owner field for prod and model that as functions.
-  ref: null | (((handle: mixed) => void) & {_stringRef: ?string}) | RefObject,
+  ref:
+    | null
+    | (((handle: mixed) => void) & {_stringRef: ?string, ...})
+    | RefObject,
 
   // Input is the data coming into process this fiber. Arguments. Props.
   pendingProps: any, // This type will be more specific once we overload the tag.
diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.js b/packages/react-reconciler/src/ReactFiberCommitWork.js
index 953adfb468441..77b074a175222 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.js
@@ -914,8 +914,11 @@ function emptyPortalContainer(current: Fiber) {
     return;
   }
 
-  const portal: {containerInfo: Container, pendingChildren: ChildSet} =
-    current.stateNode;
+  const portal: {
+    containerInfo: Container,
+    pendingChildren: ChildSet,
+    ...
+  } = current.stateNode;
   const {containerInfo} = portal;
   const emptyChildSet = createContainerChildSet(containerInfo);
   replaceContainerChildren(containerInfo, emptyChildSet);
@@ -938,6 +941,7 @@ function commitContainer(finishedWork: Fiber) {
       const portalOrRoot: {
         containerInfo: Container,
         pendingChildren: ChildSet,
+        ...
       } = finishedWork.stateNode;
       const {containerInfo, pendingChildren} = portalOrRoot;
       replaceContainerChildren(containerInfo, pendingChildren);
diff --git a/packages/react-reconciler/src/ReactFiberCompleteWork.js b/packages/react-reconciler/src/ReactFiberCompleteWork.js
index 46ebd9799fd20..1138dc57116b9 100644
--- a/packages/react-reconciler/src/ReactFiberCompleteWork.js
+++ b/packages/react-reconciler/src/ReactFiberCompleteWork.js
@@ -435,6 +435,7 @@ if (supportsMutation) {
     const portalOrRoot: {
       containerInfo: Container,
       pendingChildren: ChildSet,
+      ...
     } = workInProgress.stateNode;
     const childrenUnchanged = workInProgress.firstEffect === null;
     if (childrenUnchanged) {
diff --git a/packages/react-reconciler/src/ReactFiberHooks.js b/packages/react-reconciler/src/ReactFiberHooks.js
index bd540ef9a0b61..393b2c5653660 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.js
@@ -59,7 +59,7 @@ import {
 
 const {ReactCurrentDispatcher, ReactCurrentBatchConfig} = ReactSharedInternals;
 
-export type Dispatcher = {
+export type Dispatcher = {|
   readContext<T>(
     context: ReactContext<T>,
     observedBits: void | number | boolean,
@@ -74,7 +74,7 @@ export type Dispatcher = {
     context: ReactContext<T>,
     observedBits: void | number | boolean,
   ): T,
-  useRef<T>(initialValue: T): {current: T},
+  useRef<T>(initialValue: T): {|current: T|},
   useEffect(
     create: () => (() => void) | void,
     deps: Array<mixed> | void | null,
@@ -86,7 +86,7 @@ export type Dispatcher = {
   useCallback<T>(callback: T, deps: Array<mixed> | void | null): T,
   useMemo<T>(nextCreate: () => T, deps: Array<mixed> | void | null): T,
   useImperativeHandle<T>(
-    ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+    ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
     create: () => T,
     deps: Array<mixed> | void | null,
   ): void,
@@ -99,25 +99,24 @@ export type Dispatcher = {
   useTransition(
     config: SuspenseConfig | void | null,
   ): [(() => void) => void, boolean],
-};
+|};
 
-type Update<S, A> = {
+type Update<S, A> = {|
   expirationTime: ExpirationTime,
   suspenseConfig: null | SuspenseConfig,
   action: A,
   eagerReducer: ((S, A) => S) | null,
   eagerState: S | null,
   next: Update<S, A>,
-
   priority?: ReactPriorityLevel,
-};
+|};
 
-type UpdateQueue<S, A> = {
+type UpdateQueue<S, A> = {|
   pending: Update<S, A> | null,
   dispatch: (A => mixed) | null,
   lastRenderedReducer: ((S, A) => S) | null,
   lastRenderedState: S | null,
-};
+|};
 
 export type HookType =
   | 'useState'
@@ -139,27 +138,23 @@ if (__DEV__) {
   didWarnAboutMismatchedHooksForComponent = new Set();
 }
 
-export type Hook = {
+export type Hook = {|
   memoizedState: any,
-
   baseState: any,
   baseQueue: Update<any, any> | null,
   queue: UpdateQueue<any, any> | null,
-
   next: Hook | null,
-};
+|};
 
-type Effect = {
+type Effect = {|
   tag: HookEffectTag,
   create: () => (() => void) | void,
   destroy: (() => void) | void,
   deps: Array<mixed> | null,
   next: Effect,
-};
+|};
 
-export type FunctionComponentUpdateQueue = {
-  lastEffect: Effect | null,
-};
+export type FunctionComponentUpdateQueue = {|lastEffect: Effect | null|};
 
 export type TimeoutConfig = {|
   timeoutMs: number,
@@ -885,7 +880,7 @@ function pushEffect(tag, create, destroy, deps) {
   return effect;
 }
 
-function mountRef<T>(initialValue: T): {current: T} {
+function mountRef<T>(initialValue: T): {|current: T|} {
   const hook = mountWorkInProgressHook();
   const ref = {current: initialValue};
   if (__DEV__) {
@@ -895,7 +890,7 @@ function mountRef<T>(initialValue: T): {current: T} {
   return ref;
 }
 
-function updateRef<T>(initialValue: T): {current: T} {
+function updateRef<T>(initialValue: T): {|current: T|} {
   const hook = updateWorkInProgressHook();
   return hook.memoizedState;
 }
@@ -991,7 +986,7 @@ function updateLayoutEffect(
 
 function imperativeHandleEffect<T>(
   create: () => T,
-  ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+  ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
 ) {
   if (typeof ref === 'function') {
     const refCallback = ref;
@@ -1020,7 +1015,7 @@ function imperativeHandleEffect<T>(
 }
 
 function mountImperativeHandle<T>(
-  ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+  ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
   create: () => T,
   deps: Array<mixed> | void | null,
 ): void {
@@ -1047,7 +1042,7 @@ function mountImperativeHandle<T>(
 }
 
 function updateImperativeHandle<T>(
-  ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+  ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
   create: () => T,
   deps: Array<mixed> | void | null,
 ): void {
@@ -1464,7 +1459,7 @@ if (__DEV__) {
       return mountEffect(create, deps);
     },
     useImperativeHandle<T>(
-      ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+      ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
       create: () => T,
       deps: Array<mixed> | void | null,
     ): void {
@@ -1509,7 +1504,7 @@ if (__DEV__) {
         ReactCurrentDispatcher.current = prevDispatcher;
       }
     },
-    useRef<T>(initialValue: T): {current: T} {
+    useRef<T>(initialValue: T): {|current: T|} {
       currentHookNameInDev = 'useRef';
       mountHookTypesDev();
       return mountRef(initialValue);
@@ -1584,7 +1579,7 @@ if (__DEV__) {
       return mountEffect(create, deps);
     },
     useImperativeHandle<T>(
-      ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+      ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
       create: () => T,
       deps: Array<mixed> | void | null,
     ): void {
@@ -1626,7 +1621,7 @@ if (__DEV__) {
         ReactCurrentDispatcher.current = prevDispatcher;
       }
     },
-    useRef<T>(initialValue: T): {current: T} {
+    useRef<T>(initialValue: T): {|current: T|} {
       currentHookNameInDev = 'useRef';
       updateHookTypesDev();
       return mountRef(initialValue);
@@ -1701,7 +1696,7 @@ if (__DEV__) {
       return updateEffect(create, deps);
     },
     useImperativeHandle<T>(
-      ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+      ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
       create: () => T,
       deps: Array<mixed> | void | null,
     ): void {
@@ -1743,7 +1738,7 @@ if (__DEV__) {
         ReactCurrentDispatcher.current = prevDispatcher;
       }
     },
-    useRef<T>(initialValue: T): {current: T} {
+    useRef<T>(initialValue: T): {|current: T|} {
       currentHookNameInDev = 'useRef';
       updateHookTypesDev();
       return updateRef(initialValue);
@@ -1822,7 +1817,7 @@ if (__DEV__) {
       return mountEffect(create, deps);
     },
     useImperativeHandle<T>(
-      ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+      ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
       create: () => T,
       deps: Array<mixed> | void | null,
     ): void {
@@ -1868,7 +1863,7 @@ if (__DEV__) {
         ReactCurrentDispatcher.current = prevDispatcher;
       }
     },
-    useRef<T>(initialValue: T): {current: T} {
+    useRef<T>(initialValue: T): {|current: T|} {
       currentHookNameInDev = 'useRef';
       warnInvalidHookAccess();
       mountHookTypesDev();
@@ -1953,7 +1948,7 @@ if (__DEV__) {
       return updateEffect(create, deps);
     },
     useImperativeHandle<T>(
-      ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+      ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
       create: () => T,
       deps: Array<mixed> | void | null,
     ): void {
@@ -1999,7 +1994,7 @@ if (__DEV__) {
         ReactCurrentDispatcher.current = prevDispatcher;
       }
     },
-    useRef<T>(initialValue: T): {current: T} {
+    useRef<T>(initialValue: T): {|current: T|} {
       currentHookNameInDev = 'useRef';
       warnInvalidHookAccess();
       updateHookTypesDev();
diff --git a/packages/react-reconciler/src/ReactFiberNewContext.js b/packages/react-reconciler/src/ReactFiberNewContext.js
index ac7fdd79853e0..510c1eb674ad1 100644
--- a/packages/react-reconciler/src/ReactFiberNewContext.js
+++ b/packages/react-reconciler/src/ReactFiberNewContext.js
@@ -16,6 +16,7 @@ export type ContextDependency<T> = {
   context: ReactContext<T>,
   observedBits: number,
   next: ContextDependency<mixed> | null,
+  ...
 };
 
 import {isPrimaryRenderer} from './ReactFiberHostConfig';
diff --git a/packages/react-reconciler/src/ReactFiberRoot.js b/packages/react-reconciler/src/ReactFiberRoot.js
index ee6ebbca5d3f0..e0de5ecfd8970 100644
--- a/packages/react-reconciler/src/ReactFiberRoot.js
+++ b/packages/react-reconciler/src/ReactFiberRoot.js
@@ -100,6 +100,7 @@ export type FiberRoot = {
   ...BaseFiberRootProperties,
   ...ProfilingOnlyFiberRootProperties,
   ...SuspenseCallbackOnlyFiberRootProperties,
+  ...
 };
 
 function FiberRootNode(containerInfo, tag, hydrate) {
diff --git a/packages/react-reconciler/src/ReactFiberStack.js b/packages/react-reconciler/src/ReactFiberStack.js
index 1a7b0620e9aab..f27aeb65039be 100644
--- a/packages/react-reconciler/src/ReactFiberStack.js
+++ b/packages/react-reconciler/src/ReactFiberStack.js
@@ -9,9 +9,7 @@
 
 import type {Fiber} from './ReactFiber';
 
-export type StackCursor<T> = {
-  current: T,
-};
+export type StackCursor<T> = {|current: T|};
 
 const valueStack: Array<any> = [];
 
diff --git a/packages/react-reconciler/src/ReactFiberSuspenseComponent.js b/packages/react-reconciler/src/ReactFiberSuspenseComponent.js
index d988c8d1b1f77..f1c11d2f86a9e 100644
--- a/packages/react-reconciler/src/ReactFiberSuspenseComponent.js
+++ b/packages/react-reconciler/src/ReactFiberSuspenseComponent.js
@@ -20,6 +20,7 @@ import {
 export type SuspenseHydrationCallbacks = {
   onHydrated?: (suspenseInstance: SuspenseInstance) => void,
   onDeleted?: (suspenseInstance: SuspenseInstance) => void,
+  ...
 };
 
 // A null SuspenseState represents an unsuspended normal Suspense boundary.
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.js b/packages/react-reconciler/src/ReactFiberWorkLoop.js
index c0deae8d75f98..cb9de0ba4a884 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.js
@@ -211,9 +211,9 @@ const RootCompleted = 5;
 
 export type Thenable = {
   then(resolve: () => mixed, reject?: () => mixed): Thenable | void,
-
   // Special flag to opt out of tracing interactions across a Suspense boundary.
   __reactDoNotTraceInteractions?: boolean,
+  ...
 };
 
 // Describes where we are in the React execution stack
diff --git a/packages/react-reconciler/src/ReactProfilerTimer.js b/packages/react-reconciler/src/ReactProfilerTimer.js
index 6aa1642dfe6c0..c26f66d969244 100644
--- a/packages/react-reconciler/src/ReactProfilerTimer.js
+++ b/packages/react-reconciler/src/ReactProfilerTimer.js
@@ -23,6 +23,7 @@ export type ProfilerTimer = {
   startProfilerTimer(fiber: Fiber): void,
   stopProfilerTimerIfRunning(fiber: Fiber): void,
   stopProfilerTimerIfRunningAndRecordDelta(fiber: Fiber): void,
+  ...
 };
 
 let commitTime: number = 0;
diff --git a/packages/react-reconciler/src/ReactUpdateQueue.js b/packages/react-reconciler/src/ReactUpdateQueue.js
index 2c3e65bd0d7f0..dba13e3cf2a38 100644
--- a/packages/react-reconciler/src/ReactUpdateQueue.js
+++ b/packages/react-reconciler/src/ReactUpdateQueue.js
@@ -107,7 +107,7 @@ import {
 import invariant from 'shared/invariant';
 import {getCurrentPriorityLevel} from './SchedulerWithReactIntegration';
 
-export type Update<State> = {
+export type Update<State> = {|
   expirationTime: ExpirationTime,
   suspenseConfig: null | SuspenseConfig,
 
@@ -117,20 +117,18 @@ export type Update<State> = {
 
   next: Update<State>,
 
-  //DEV only
+  // DEV only
   priority?: ReactPriorityLevel,
-};
+|};
 
-type SharedQueue<State> = {
-  pending: Update<State> | null,
-};
+type SharedQueue<State> = {|pending: Update<State> | null|};
 
-export type UpdateQueue<State> = {
+export type UpdateQueue<State> = {|
   baseState: State,
   baseQueue: Update<State> | null,
   shared: SharedQueue<State>,
   effects: Array<Update<State>> | null,
-};
+|};
 
 export const UpdateState = 0;
 export const ReplaceState = 1;
diff --git a/packages/react-reconciler/src/SchedulerWithReactIntegration.js b/packages/react-reconciler/src/SchedulerWithReactIntegration.js
index 3447fdcaebf21..71aacf4853851 100644
--- a/packages/react-reconciler/src/SchedulerWithReactIntegration.js
+++ b/packages/react-reconciler/src/SchedulerWithReactIntegration.js
@@ -46,9 +46,7 @@ if (enableSchedulerTracing) {
 export type ReactPriorityLevel = 99 | 98 | 97 | 96 | 95 | 90;
 export type SchedulerCallback = (isSync: boolean) => SchedulerCallback | null;
 
-type SchedulerCallbackOptions = {
-  timeout?: number,
-};
+type SchedulerCallbackOptions = {timeout?: number, ...};
 
 const fakeCallbackNode = {};
 
diff --git a/packages/react-refresh/src/ReactFreshRuntime.js b/packages/react-refresh/src/ReactFreshRuntime.js
index 8f5849c076aa6..05ded5abc3a06 100644
--- a/packages/react-refresh/src/ReactFreshRuntime.js
+++ b/packages/react-refresh/src/ReactFreshRuntime.js
@@ -488,7 +488,7 @@ export function injectIntoGlobalHook(globalObject: any): void {
     hook.onScheduleFiberRoot = function(
       id: number,
       root: FiberRoot,
-      children: mixed,
+      children: ReactNodeList,
     ) {
       if (!isPerformingRefresh) {
         // If it was intentionally scheduled, don't attempt to restore.
diff --git a/packages/react-server/src/ReactFizzStreamer.js b/packages/react-server/src/ReactFizzStreamer.js
index de6b7745629cc..eeadab8c14d21 100644
--- a/packages/react-server/src/ReactFizzStreamer.js
+++ b/packages/react-server/src/ReactFizzStreamer.js
@@ -26,6 +26,7 @@ type OpaqueRequest = {
   children: ReactNodeList,
   completedChunks: Array<Uint8Array>,
   flowing: boolean,
+  ...
 };
 
 export function createRequest(
diff --git a/packages/react-server/src/ReactFlightServer.js b/packages/react-server/src/ReactFlightServer.js
index d8203d58699c4..9f896a1b0a2b0 100644
--- a/packages/react-server/src/ReactFlightServer.js
+++ b/packages/react-server/src/ReactFlightServer.js
@@ -95,14 +95,13 @@ type ReactJSONValue =
   | Array<ReactModel>
   | ReactModelObject;
 
-type ReactModelObject = {
-  +[key: string]: ReactModel,
-};
+type ReactModelObject = {+[key: string]: ReactModel, ...};
 
 type Segment = {
   id: number,
   model: ReactModel,
   ping: () => void,
+  ...
 };
 
 type OpaqueRequest = {
@@ -114,6 +113,7 @@ type OpaqueRequest = {
   completedErrorChunks: Array<Uint8Array>,
   flowing: boolean,
   toJSON: (key: string, value: ReactModel) => ReactJSONValue,
+  ...
 };
 
 export function createRequest(
diff --git a/packages/react-server/src/ReactServerHostConfigNode.js b/packages/react-server/src/ReactServerHostConfigNode.js
index 6644beae8f10a..c3d080ca47dfc 100644
--- a/packages/react-server/src/ReactServerHostConfigNode.js
+++ b/packages/react-server/src/ReactServerHostConfigNode.js
@@ -11,7 +11,9 @@ import type {Writable} from 'stream';
 
 type MightBeFlushable = {
   flush?: () => void,
-  flushHeaders?: () => void, // Legacy
+  // Legacy
+  flushHeaders?: () => void,
+  ...
 };
 
 export type Destination = Writable & MightBeFlushable;
diff --git a/packages/react-test-renderer/src/ReactShallowRenderer.js b/packages/react-test-renderer/src/ReactShallowRenderer.js
index fbe4f79836a75..ab303b180573b 100644
--- a/packages/react-test-renderer/src/ReactShallowRenderer.js
+++ b/packages/react-test-renderer/src/ReactShallowRenderer.js
@@ -27,21 +27,21 @@ import type {ReactElement} from 'shared/ReactElementType';
 type BasicStateAction<S> = (S => S) | S;
 type Dispatch<A> = A => void;
 
-type Update<A> = {
+type Update<A> = {|
   action: A,
   next: Update<A> | null,
-};
+|};
 
-type UpdateQueue<A> = {
+type UpdateQueue<A> = {|
   first: Update<A> | null,
   dispatch: any,
-};
+|};
 
-type Hook = {
+type Hook = {|
   memoizedState: any,
   queue: UpdateQueue<any> | null,
   next: Hook | null,
-};
+|};
 
 const {ReactCurrentDispatcher} = ReactSharedInternals;
 
@@ -340,7 +340,7 @@ class ReactShallowRenderer {
       return nextValue;
     };
 
-    const useRef = <T>(initialValue: T): {current: T} => {
+    const useRef = <T>(initialValue: T): {|current: T|} => {
       this._validateCurrentlyRenderingComponent();
       this._createWorkInProgressHook();
       const previousRef = (this._workInProgressHook: any).memoizedState;
diff --git a/packages/react-test-renderer/src/ReactTestHostConfig.js b/packages/react-test-renderer/src/ReactTestHostConfig.js
index d3a2bbf7bd117..170cc08f143e7 100644
--- a/packages/react-test-renderer/src/ReactTestHostConfig.js
+++ b/packages/react-test-renderer/src/ReactTestHostConfig.js
@@ -195,7 +195,7 @@ export function prepareUpdate(
   newProps: Props,
   rootContainerInstance: Container,
   hostContext: Object,
-): null | {} {
+): null | {...} {
   return UPDATE_SIGNAL;
 }
 
@@ -246,7 +246,7 @@ export const supportsMutation = true;
 
 export function commitUpdate(
   instance: Instance,
-  updatePayload: {},
+  updatePayload: {...},
   type: string,
   oldProps: Props,
   newProps: Props,
diff --git a/packages/react-test-renderer/src/ReactTestRenderer.js b/packages/react-test-renderer/src/ReactTestRenderer.js
index 6a778f80cecaf..ca56ffaaa2685 100644
--- a/packages/react-test-renderer/src/ReactTestRenderer.js
+++ b/packages/react-test-renderer/src/ReactTestRenderer.js
@@ -50,11 +50,12 @@ import {ConcurrentRoot, LegacyRoot} from 'shared/ReactRootTags';
 type TestRendererOptions = {
   createNodeMock: (element: React$Element<any>) => any,
   unstable_isConcurrent: boolean,
+  ...
 };
 
 type ReactTestRendererJSON = {|
   type: string,
-  props: {[propName: string]: any},
+  props: {[propName: string]: any, ...},
   children: null | Array<ReactTestRendererNode>,
   $$typeof?: Symbol, // Optional because we add it with defineProperty().
 |};
@@ -64,6 +65,7 @@ type FindOptions = $Shape<{
   // performs a "greedy" search: if a matching node is found, will continue
   // to search within the matching node's children. (default: true)
   deep: boolean,
+  ...
 }>;
 
 export type Predicate = (node: ReactTestInstance) => ?boolean;
diff --git a/packages/react/src/ReactHooks.js b/packages/react/src/ReactHooks.js
index cdac30cdc40ff..3e28896f2bb89 100644
--- a/packages/react/src/ReactHooks.js
+++ b/packages/react/src/ReactHooks.js
@@ -86,7 +86,7 @@ export function useReducer<S, I, A>(
   return dispatcher.useReducer(reducer, initialArg, init);
 }
 
-export function useRef<T>(initialValue: T): {current: T} {
+export function useRef<T>(initialValue: T): {|current: T|} {
   const dispatcher = resolveDispatcher();
   return dispatcher.useRef(initialValue);
 }
@@ -124,7 +124,7 @@ export function useMemo(
 }
 
 export function useImperativeHandle<T>(
-  ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,
+  ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
   create: () => T,
   inputs: Array<mixed> | void | null,
 ): void {
diff --git a/packages/scheduler/src/SchedulerMinHeap.js b/packages/scheduler/src/SchedulerMinHeap.js
index 467cc92a22754..03d82f4df65cc 100644
--- a/packages/scheduler/src/SchedulerMinHeap.js
+++ b/packages/scheduler/src/SchedulerMinHeap.js
@@ -8,10 +8,10 @@
  */
 
 type Heap = Array<Node>;
-type Node = {
+type Node = {|
   id: number,
   sortIndex: number,
-};
+|};
 
 export function push(heap: Heap, node: Node): void {
   const index = heap.length;
diff --git a/packages/scheduler/src/SchedulerProfiling.js b/packages/scheduler/src/SchedulerProfiling.js
index e1e05ca5d8b66..810a5be223279 100644
--- a/packages/scheduler/src/SchedulerProfiling.js
+++ b/packages/scheduler/src/SchedulerProfiling.js
@@ -103,7 +103,11 @@ export function stopLoggingProfilingEvents(): ArrayBuffer | null {
 }
 
 export function markTaskStart(
-  task: {id: number, priorityLevel: PriorityLevel},
+  task: {
+    id: number,
+    priorityLevel: PriorityLevel,
+    ...
+  },
   ms: number,
 ) {
   if (enableProfiling) {
@@ -122,6 +126,7 @@ export function markTaskCompleted(
   task: {
     id: number,
     priorityLevel: PriorityLevel,
+    ...
   },
   ms: number,
 ) {
@@ -140,6 +145,7 @@ export function markTaskCanceled(
   task: {
     id: number,
     priorityLevel: PriorityLevel,
+    ...
   },
   ms: number,
 ) {
@@ -156,6 +162,7 @@ export function markTaskErrored(
   task: {
     id: number,
     priorityLevel: PriorityLevel,
+    ...
   },
   ms: number,
 ) {
@@ -171,7 +178,11 @@ export function markTaskErrored(
 }
 
 export function markTaskRun(
-  task: {id: number, priorityLevel: PriorityLevel},
+  task: {
+    id: number,
+    priorityLevel: PriorityLevel,
+    ...
+  },
   ms: number,
 ) {
   if (enableProfiling) {
@@ -187,7 +198,7 @@ export function markTaskRun(
   }
 }
 
-export function markTaskYield(task: {id: number}, ms: number) {
+export function markTaskYield(task: {id: number, ...}, ms: number) {
   if (enableProfiling) {
     profilingState[PRIORITY] = NoPriority;
     profilingState[CURRENT_TASK_ID] = 0;
diff --git a/packages/scheduler/src/Tracing.js b/packages/scheduler/src/Tracing.js
index 1223d44a2cf28..cc71b03f9065f 100644
--- a/packages/scheduler/src/Tracing.js
+++ b/packages/scheduler/src/Tracing.js
@@ -45,15 +45,12 @@ export type Subscriber = {
   // A batch of work has completed for a set of interactions.
   // Work is done by a "thread" which is identified by a unique ID.
   onWorkStopped: (interactions: Set<Interaction>, threadID: number) => void,
+  ...
 };
 
-export type InteractionsRef = {
-  current: Set<Interaction>,
-};
+export type InteractionsRef = {|current: Set<Interaction>|};
 
-export type SubscriberRef = {
-  current: Subscriber | null,
-};
+export type SubscriberRef = {|current: Subscriber | null|};
 
 const DEFAULT_THREAD_ID = 0;
 
diff --git a/packages/shared/ReactDOMTypes.js b/packages/shared/ReactDOMTypes.js
index fc5673bd11d12..19cd62793b1ad 100644
--- a/packages/shared/ReactDOMTypes.js
+++ b/packages/shared/ReactDOMTypes.js
@@ -30,6 +30,7 @@ export type ReactDOMResponderEvent = {
   pointerType: PointerType,
   target: Element | Document,
   type: string,
+  ...
 };
 
 export type ReactDOMEventResponder = ReactEventResponder<
@@ -72,4 +73,5 @@ export type ReactDOMResponderContext = {
   // Used for controller components
   enqueueStateRestore(Element | Document): void,
   getResponderNode(): Element | null,
+  ...
 };
diff --git a/packages/shared/ReactElementType.js b/packages/shared/ReactElementType.js
index a27afea897c55..8e61126575afb 100644
--- a/packages/shared/ReactElementType.js
+++ b/packages/shared/ReactElementType.js
@@ -7,24 +7,23 @@
  * @flow
  */
 
-export type Source = {
+export type Source = {|
   fileName: string,
   lineNumber: number,
-};
+|};
 
-export type ReactElement = {
+export type ReactElement = {|
   $$typeof: any,
   type: any,
   key: any,
   ref: any,
   props: any,
-  _owner: any, // ReactInstance or ReactFiber
+  // ReactFiber
+  _owner: any,
 
   // __DEV__
-  _store: {
-    validated: boolean,
-  },
+  _store: {validated: boolean, ...},
   _self: React$Element<any>,
   _shadowChildren: any,
   _source: Source,
-};
+|};
diff --git a/packages/shared/ReactLazyComponent.js b/packages/shared/ReactLazyComponent.js
index 00c375a1bcc72..246ba41e83da5 100644
--- a/packages/shared/ReactLazyComponent.js
+++ b/packages/shared/ReactLazyComponent.js
@@ -9,20 +9,23 @@
 
 export type Thenable<T, R> = {
   then(resolve: (T) => mixed, reject: (mixed) => mixed): R,
+  ...
 };
 
 export type LazyComponent<T> = {
   $$typeof: Symbol | number,
-  _ctor: () => Thenable<{default: T}, mixed>,
+  _ctor: () => Thenable<{default: T, ...}, mixed>,
   _status: 0 | 1 | 2,
   _result: any,
+  ...
 };
 
 type ResolvedLazyComponent<T> = {
   $$typeof: Symbol | number,
-  _ctor: () => Thenable<{default: T}, mixed>,
+  _ctor: () => Thenable<{default: T, ...}, mixed>,
   _status: 1,
   _result: any,
+  ...
 };
 
 export const Uninitialized = -1;
diff --git a/packages/shared/ReactTypes.js b/packages/shared/ReactTypes.js
index f9d45d5252a12..e97e582339349 100644
--- a/packages/shared/ReactTypes.js
+++ b/packages/shared/ReactTypes.js
@@ -31,12 +31,15 @@ export type ReactProvider<T> = {
   props: {
     value: T,
     children?: ReactNodeList,
+    ...
   },
+  ...
 };
 
 export type ReactProviderType<T> = {
   $$typeof: Symbol | number,
   _context: ReactContext<T>,
+  ...
 };
 
 export type ReactConsumer<T> = {
@@ -47,23 +50,23 @@ export type ReactConsumer<T> = {
   props: {
     children: (value: T) => ReactNodeList,
     unstable_observedBits?: number,
+    ...
   },
+  ...
 };
 
 export type ReactContext<T> = {
   $$typeof: Symbol | number,
   Consumer: ReactContext<T>,
   Provider: ReactProviderType<T>,
-
   _calculateChangedBits: ((a: T, b: T) => number) | null,
-
   _currentValue: T,
   _currentValue2: T,
   _threadCount: number,
-
   // DEV only
   _currentRenderer?: Object | null,
   _currentRenderer2?: Object | null,
+  ...
 };
 
 export type ReactPortal = {
@@ -73,6 +76,7 @@ export type ReactPortal = {
   children: ReactNodeList,
   // TODO: figure out the API for cross-renderer implementation.
   implementation: any,
+  ...
 };
 
 export type RefObject = {|
@@ -97,6 +101,7 @@ export type ReactEventResponder<E, C> = {
   displayName: string,
   targetEventTypes: null | Array<string>,
   targetPortalPropagation: boolean,
+  rootEventTypes: null | Array<string>,
   getInitialState: null | ((props: Object) => Object),
   onEvent:
     | null
@@ -106,6 +111,7 @@ export type ReactEventResponder<E, C> = {
     | ((event: E, context: C, props: Object, state: Object) => void),
   onMount: null | ((context: C, props: Object, state: Object) => void),
   onUnmount: null | ((context: C, props: Object, state: Object) => void),
+  ...
 };
 
 export type EventPriority = 0 | 1 | 2;
@@ -152,6 +158,7 @@ export type ReactFundamentalImpl<C, H> = {
   ) => void,
   onHydrate?: (context: C, props: Object, state: Object) => boolean,
   onFocus?: (context: C, props: Object, state: Object) => boolean,
+  ...
 };
 
 export type ReactFundamentalComponent<C, H> = {|
diff --git a/packages/shared/isTextInputElement.js b/packages/shared/isTextInputElement.js
index 4d92caa35cf43..71ff8ab91b45a 100644
--- a/packages/shared/isTextInputElement.js
+++ b/packages/shared/isTextInputElement.js
@@ -10,7 +10,7 @@
 /**
  * @see http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#input-type-attr-summary
  */
-const supportedInputTypes: {[key: string]: true | void} = {
+const supportedInputTypes: {[key: string]: true | void, ...} = {
   color: true,
   date: true,
   datetime: true,
diff --git a/scripts/error-codes/Types.js b/scripts/error-codes/Types.js
index ff21bce639414..d9ddadbccd7e7 100644
--- a/scripts/error-codes/Types.js
+++ b/scripts/error-codes/Types.js
@@ -8,5 +8,5 @@
  */
 'use strict';
 
-/*:: export type ErrorMap = { [id: string]: string; }; */
+/*:: export type ErrorMap = { [id: string]: string, ... }; */
 
diff --git a/scripts/flow/config/flowconfig b/scripts/flow/config/flowconfig
index 22f1033e59246..b0c2656a019f4 100644
--- a/scripts/flow/config/flowconfig
+++ b/scripts/flow/config/flowconfig
@@ -49,4 +49,4 @@ suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
 suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 
 [version]
-^0.72.0
\ No newline at end of file
+^0.84.0
\ No newline at end of file
diff --git a/scripts/flow/environment.js b/scripts/flow/environment.js
index 0a742aad4022f..8d3580a215ac3 100644
--- a/scripts/flow/environment.js
+++ b/scripts/flow/environment.js
@@ -32,9 +32,7 @@ declare module 'ReactFeatureFlags' {
 
 // ReactFiberErrorDialog www fork
 declare module 'ReactFiberErrorDialog' {
-  declare module.exports: {
-    showErrorDialog: (error: mixed) => boolean,
-  };
+  declare module.exports: {showErrorDialog: (error: mixed) => boolean, ...};
 }
 
 // EventListener www fork
@@ -45,7 +43,7 @@ declare module 'EventListener' {
       type: string,
       callback: Function,
       priority?: number,
-      options?: {passive: boolean},
+      options?: {passive: boolean, ...},
     ) => mixed,
     capture: (target: Element, type: string, callback: Function) => mixed,
     captureWithPassiveFlag: (
@@ -54,5 +52,6 @@ declare module 'EventListener' {
       callback: Function,
       passive: boolean,
     ) => mixed,
+    ...
   };
 }
diff --git a/scripts/flow/react-native-host-hooks.js b/scripts/flow/react-native-host-hooks.js
index a0aaa4ebc5ed7..38625c31e291c 100644
--- a/scripts/flow/react-native-host-hooks.js
+++ b/scripts/flow/react-native-host-hooks.js
@@ -37,17 +37,18 @@ declare module 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface'
   declare export function flattenStyle(style: any): any;
   declare export var RCTEventEmitter: {
     register: (eventEmitter: mixed) => void,
+    ...
   };
   declare export var TextInputState: {
     blurTextInput: (object: any) => void,
     focusTextInput: (object: any) => void,
+    ...
   };
   declare export var ReactFiberErrorDialog: {
     showErrorDialog: (error: CapturedError) => boolean,
+    ...
   };
-  declare export var Platform: {
-    OS: string,
-  };
+  declare export var Platform: {OS: string, ...};
   declare export var UIManager: {
     customBubblingEventTypes: Object,
     customDirectEventTypes: Object,
@@ -90,13 +91,16 @@ declare module 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface'
         height?: number,
         format?: 'png' | 'jpeg',
         quality?: number,
+        ...
       },
     ) => Promise<any>,
     setJSResponder: (reactTag: number, blockNativeResponder: boolean) => void,
     clearJSResponder: () => void,
+    ...
   };
   declare export var BatchedBridge: {
     registerCallableModule: (name: string, module: Object) => void,
+    ...
   };
   declare export var ReactNativeViewConfigRegistry: {
     customBubblingEventTypes: Object,
@@ -105,6 +109,7 @@ declare module 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface'
 
     register: (name: string, callback: ViewConfigGetter) => string,
     get: (name: string) => ReactNativeBaseComponentViewConfig,
+    ...
   };
 }
 
@@ -151,6 +156,7 @@ declare var nativeFabricUIManager: {
     onFail: () => void,
     onSuccess: MeasureLayoutOnSuccessCallback,
   ) => void,
+  ...
 };
 
 declare module 'View' {
diff --git a/scripts/print-warnings/print-warnings.js b/scripts/print-warnings/print-warnings.js
index 2e61598ad935a..163aacf00ac4f 100644
--- a/scripts/print-warnings/print-warnings.js
+++ b/scripts/print-warnings/print-warnings.js
@@ -6,7 +6,7 @@
  */
 'use strict';
 
-const babylon = require('babylon');
+const babelParser = require('@babel/parser');
 const fs = require('fs');
 const through = require('through2');
 const traverse = require('@babel/traverse').default;
@@ -14,9 +14,9 @@ const gs = require('glob-stream');
 
 const evalToString = require('../shared/evalToString');
 
-const babylonOptions = {
+const parserOptions = {
   sourceType: 'module',
-  // As a parser, babylon has its own options and we can't directly
+  // babelParser has its own options and we can't directly
   // import/require a babel preset. It should be kept **the same** as
   // the `babel-plugin-syntax-*` ones specified in
   // https://github.com/facebook/fbjs/blob/master/packages/babel-preset-fbjs/configure.js
@@ -40,7 +40,7 @@ function transform(file, enc, cb) {
 
     let ast;
     try {
-      ast = babylon.parse(source, babylonOptions);
+      ast = babelParser.parse(source, parserOptions);
     } catch (error) {
       console.error('Failed to parse source file:', file.path);
       throw error;
diff --git a/scripts/rollup/shims/react-native/ReactFeatureFlags.js b/scripts/rollup/shims/react-native/ReactFeatureFlags.js
index b52380c7603c5..9b6ec97a6234c 100644
--- a/scripts/rollup/shims/react-native/ReactFeatureFlags.js
+++ b/scripts/rollup/shims/react-native/ReactFeatureFlags.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  *
  * @format
- * @flow
+ * @flow strict-local
  */
 
 'use strict';
diff --git a/scripts/rollup/shims/react-native/ReactNativeViewConfigRegistry.js b/scripts/rollup/shims/react-native/ReactNativeViewConfigRegistry.js
index 9f82a17b61107..2c09ddf3caab1 100644
--- a/scripts/rollup/shims/react-native/ReactNativeViewConfigRegistry.js
+++ b/scripts/rollup/shims/react-native/ReactNativeViewConfigRegistry.js
@@ -27,11 +27,13 @@ const customBubblingEventTypes: {
       bubbled: string,
     |}>,
   |}>,
+  ...,
 } = {};
 const customDirectEventTypes: {
   [eventName: string]: $ReadOnly<{|
     registrationName: string,
   |}>,
+  ...,
 } = {};
 
 exports.customBubblingEventTypes = customBubblingEventTypes;
diff --git a/yarn.lock b/yarn.lock
index bead32eaebf52..c627174b6325b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2723,7 +2723,7 @@ babel-types@^6.24.1, babel-types@^6.26.0:
     lodash "^4.17.4"
     to-fast-properties "^1.0.3"
 
-babylon@6.18.0, babylon@^6.18.0:
+babylon@^6.18.0:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.18.0.tgz#af2f3b88fa6f5c1e4c634d1a0f8eac4f55b395e3"
   integrity sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==
@@ -5696,10 +5696,10 @@ flatted@^2.0.0:
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.1.tgz#69e57caa8f0eacbc281d2e2cb458d46fdb449e08"
   integrity sha512-a1hQMktqW9Nmqr5aktAux3JMNqaucxGcjtjWnZLHX7yyPCmlSV3M54nGYbqT8K+0GhF3NBgmJCc3ma+WOgX8Jg==
 
-flow-bin@^0.72.0:
-  version "0.72.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.72.0.tgz#12051180fb2db7ccb728fefe67c77e955e92a44d"
-  integrity sha1-EgURgPstt8y3KP7+Z8d+lV6SpE0=
+flow-bin@^0.84.0:
+  version "0.84.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.84.0.tgz#4cb2364c750fb37a7840524fa62456b53f64cdcb"
+  integrity sha512-ocji8eEYp+YfICsm+F6cIHUcD7v5sb0/ADEXm6gyUKdjQzmSckMrPUdZtyfP973t3YGHKliUMxMvIBHyR5LbXQ==
 
 fluent-syntax@0.13.0:
   version "0.13.0"