Update flow to 0.31 (#7557)

(cherry picked from commit 08614db025)

.flowconfig

@@ -28,10 +28,12 @@ munge_underscores=false
 suppress_type=$FlowIssue
 suppress_type=$FlowFixMe
 suppress_type=$FixMe
+suppress_type=$FlowExpectedError
 
-suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(2[0-4]\\|1[0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*\\)?)\\)
-suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(2[0-4]\\|1[0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*\\)?)\\)? #[0-9]+
+suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(3[0-1]\\|[1-2][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*www[a-z,_]*\\)?)\\)
+suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(3[0-1]\\|[1-2][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*www[a-z,_]*\\)?)\\)?:? #[0-9]+
 suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
+suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 
 [version]
-^0.27.0
+^0.31.0

package.json

@@ -45,7 +45,7 @@
     "eslint-plugin-react-internal": "file:eslint-rules",
     "fbjs": "^0.8.4",
     "fbjs-scripts": "^0.6.0",
-    "flow-bin": "^0.27.0",
+    "flow-bin": "^0.31.0",
     "glob": "^6.0.1",
     "grunt": "^0.4.5",
     "grunt-cli": "^0.1.13",

src/renderers/shared/fiber/ReactChildFiber.js

@@ -123,6 +123,10 @@ function ChildReconciler(shouldClone) {
 
     switch (newChildren.$$typeof) {
       case REACT_ELEMENT_TYPE: {
+        /* $FlowFixMe(>=0.31.0): This is an unsafe cast. Consider adding a type
+         *                       annotation to the `newChildren` param of this
+         *                       function.
+         */
         const element = (newChildren : ReactElement<any>);
         if (existingChild &&
             element.type === existingChild.type &&
@@ -144,6 +148,8 @@ function ChildReconciler(shouldClone) {
       }
 
       case REACT_COROUTINE_TYPE: {
+        /* $FlowFixMe(>=0.31.0): No 'handler' property found in object type
+         */
         const coroutine = (newChildren : ReactCoroutine);
         const child = createFiberFromCoroutine(coroutine, priority);
         child.return = returnFiber;
@@ -154,6 +160,9 @@ function ChildReconciler(shouldClone) {
         // A yield results in a fragment fiber whose output is the continuation.
         // TODO: When there is only a single child, we can optimize this to avoid
         // the fragment.
+        /* $FlowFixMe(>=0.31.0): No 'continuation' property found in object
+         * type
+         */
         const yieldNode = (newChildren : ReactYield);
         const reifiedYield = createReifiedYield(yieldNode);
         const child = createFiberFromYield(yieldNode, priority);
@@ -167,6 +176,11 @@ function ChildReconciler(shouldClone) {
       var first : ?Fiber = null;
       var prev : ?Fiber = null;
       var existing : ?Fiber = existingChild;
+      /* $FlowIssue(>=0.31.0) #12747709
+       *
+       * `Array.isArray` is matched syntactically for now until predicate
+       * support is complete.
+       */
       for (var i = 0; i < newChildren.length; i++) {
         var nextExisting = existing && existing.sibling;
         if (prev == null) {

src/renderers/shared/fiber/isomorphic/ReactCoroutine.js

@@ -33,6 +33,9 @@ export type ReactCoroutine = {
   children: any,
   // This should be a more specific CoroutineHandler
   handler: (props: any, yields: Array<ReifiedYield>) => ReactNodeList,
+  /* $FlowFixMe(>=0.31.0): Which is it? mixed? Or Object? Must match
+   * `ReactYield` type.
+   */
   props: mixed,
 };
 export type ReactYield = {