Setup grunt flow task and run on travis (#6684)

(cherry picked from commit c9504d99a5)

.travis.yml

@@ -83,6 +83,7 @@ env:
   - TEST_TYPE=build
   - TEST_TYPE=test
   - TEST_TYPE=lint
+  - TEST_TYPE=flow
   - TEST_TYPE=build_website
   global:
   # SERVER

Gruntfile.js

@@ -56,6 +56,8 @@ module.exports = function(grunt) {
 
   grunt.registerTask('lint', ['eslint']);
 
+  grunt.registerTask('flow', require('./grunt/tasks/flow'));
+
   grunt.registerTask('delete-build-modules', function() {
     // Use gulp here.
     spawnGulp(['react:clean'], null, this.async());

grunt/tasks/flow.js

@@ -0,0 +1,22 @@
+'use strict';
+
+var grunt = require('grunt');
+
+var extension = process.platform === 'win32' ? '.cmd': '';
+
+module.exports = function() {
+  var done = this.async();
+  grunt.util.spawn({
+    cmd: 'node_modules/.bin/flow' + extension,
+    args: ['check', '.'],
+    opts: {stdio: 'inherit'},
+  }, function(err, result, code) {
+    if (err) {
+      grunt.log.error('Flow failed');
+    } else {
+      grunt.log.ok('Flow passed');
+    }
+
+    done(code === 0);
+  });
+};

package.json

@@ -38,8 +38,9 @@
     "eslint": "1.10.3",
     "eslint-plugin-react": "4.1.0",
     "eslint-plugin-react-internal": "file:eslint-rules",
-    "fbjs": "^0.8.0",
+    "fbjs": "^0.8.1",
     "fbjs-scripts": "^0.6.0",
+    "flow-bin": "0.24.0",
     "glob": "^6.0.1",
     "grunt": "^0.4.5",
     "grunt-cli": "^0.1.13",

packages/react/package.json

@@ -23,7 +23,7 @@
     "node": ">=0.10.0"
   },
   "dependencies": {
-    "fbjs": "^0.8.0",
+    "fbjs": "^0.8.1",
     "loose-envify": "^1.1.0",
     "object-assign": "^4.1.0"
   },