Update Flow to 0.84 (#17805)

* Update Flow to 0.84

* Fix violations

* Use inexact object syntax in files from fbsource

* Fix warning extraction to use a modern parser

* Codemod inexact objects to new syntax

* Tighten types that can be exact

* Revert unintentional formatting changes from codemod

Author: gaearon

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;

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,

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;