Upgrade to Flow v0.50.0

Reviewed By: gabelevi

Differential Revision: D5438335

fbshipit-source-id: 7a96f68e7147e984c6f0cb84f957e639d36ca6b3

Author: nmote

.flowconfig

@@ -52,4 +52,4 @@ suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 unsafe.enable_getters_and_setters=true
 
 [version]
-^0.49.1
+^0.50.0

RNTester/js/XHRExampleDownload.js

@@ -79,19 +79,13 @@ class XHRExampleDownload extends React.Component {
     }
 
     const onreadystatechange = () => {
-      /* $FlowFixMe(>=0.48.0 site=react_native_fb,react_native_oss) This comment
-       * suppresses an error found when Flow v0.48 was deployed. To see the
-       * error delete this comment and run Flow. */
       if (xhr.readyState === xhr.HEADERS_RECEIVED) {
         const contentLength =
           parseInt(xhr.getResponseHeader('Content-Length'), 10);
         this.setState({
           contentLength,
           responseLength: 0,
         });
-      /* $FlowFixMe(>=0.48.0 site=react_native_fb,react_native_oss) This comment
-       * suppresses an error found when Flow v0.48 was deployed. To see the
-       * error delete this comment and run Flow. */
       } else if (xhr.readyState === xhr.LOADING && xhr.response) {
         this.setState({
           responseLength: xhr.response.length,

package.json

@@ -229,7 +229,7 @@
     "eslint-plugin-flowtype": "^2.33.0",
     "eslint-plugin-prettier": "2.1.1",
     "eslint-plugin-react": "^7.0.1",
-    "flow-bin": "^0.49.1",
+    "flow-bin": "^0.50.0",
     "jest": "20.1.0-chi.1",
     "jest-phabricator": "20.1.0-chi.1",
     "jest-repl": "20.1.0-chi.1",