Flow - A static type checker for JavaScript

.eslintrc.js

         'es6': true,
         'jasmine': true
     },
-    'extends': 'eslint:recommended',
+    'extends': [
+        'eslint:recommended',
+        'plugin:flowtype/recommended'
+    ],
     'globals': {
         // The globals that (1) are accessed but not defined within many of our
         // files, (2) are certainly defined, and (3) we would like to use
         // files.
         '__filename': false
     },
+    'parser': 'babel-eslint',
     'parserOptions': {
         'ecmaFeatures': {
             'experimentalObjectRestSpread': true
         },
         'sourceType': 'module'
     },
+    'plugins': [
+        'flowtype'
+    ],
     'rules': {
         'new-cap': 2,
         'no-console': 0,

.flowconfig

+; XXX The origin of the source code of this .flowconfig file is the jitsi-meet
+; project. As the NPM package jitsi-meet builds the NPM package lib-jitsi-meet
+; and jitsi-meet's react-native requires specific .flowconfig contents, it is
+; mandatory to keep the .flowconfig files of jitsi-meet and lib-jitsi-meet in
+; sync (e.g. the flow-bin version).
+;
+[ignore]
+; Ignore packages in node_modules which we (i.e. the lib-jitsi-meet project)
+; have seen to cause errors and we have chosen not to fix.
+
+[include]
+
+[libs]
+flow/
+
+[options]
+emoji=true
+
+module.system=node
+
+experimental.strict_type_args=true
+
+munge_underscores=true
+
+module.name_mapper='^[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\)$' -> 'RelativeImageStub'
+
+suppress_type=$FlowIssue
+suppress_type=$FlowFixMe
+suppress_type=$FixMe
+
+suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
+
+unsafe.enable_getters_and_setters=true
+
+[version]
+^0.38.0

.jshintignore

-node_modules
-doc/example/libs
+# The following do not need to be checked because they do not represent JS
+# source code.
+doc/
+node_modules/
 lib-jitsi-meet.js
-lib-jitsi-meet.min.js
 lib-jitsi-meet.js.map
-doc
+lib-jitsi-meet.min.js
 
+# The following are checked by ESLint and take advantage of advanced language
+# features such as Facebook Flow which are not supported by JSHint.
+flow-typed/
 
-modules/xmpp/xmpp.js
-modules/xmpp/strophe.jingle.js
-modules/xmpp/SDPUtil.js
-modules/xmpp/SDP.js
-modules/xmpp/strophe.emuc.js
-modules/xmpp/JingleSessionPC.js
-modules/xmpp/LocalSSRCReplacement.js
-modules/xmpp/ChatRoom.js
-modules/xmpp/ChatRoom.js
-modules/statistics/RTPStatsCollector.js
-modules/statistics/LocalStatsCollector.js
+JitsiConference.js
+JitsiConnection.js
+JitsiMeetJS.js
+JitsiParticipant.js
+modules/RTC/JitsiLocalTrack.js
+modules/RTC/JitsiRemoteTrack.js
+modules/RTC/JitsiTrack.js
+modules/RTC/DataChannels.js
 modules/RTC/adapter.screenshare.js
-modules/statistics/statistics.js
 modules/RTC/RTC.js
 modules/RTC/RTCUtils.js
 modules/RTC/TraceablePeerConnection.js
-modules/RTC/DataChannels.js
-modules/RTC/JitsiLocalTrack.js
-modules/RTC/JitsiRemoteTrack.js
-modules/RTC/JitsiTrack.js
-JitsiParticipant.js
-JitsiMeetJS.js
-JitsiConnection.js
-JitsiConference.js
+modules/statistics/LocalStatsCollector.js
+modules/statistics/RTPStatsCollector.js
+modules/statistics/statistics.js
+modules/xmpp/ChatRoom.js
+modules/xmpp/JingleSessionPC.js
+modules/xmpp/LocalSSRCReplacement.js
+modules/xmpp/SDP.js
+modules/xmpp/SDPUtil.js
+modules/xmpp/strophe.emuc.js
+modules/xmpp/strophe.jingle.js
+modules/xmpp/xmpp.js

flow-typed/npm/flow-bin_v0.x.x.js

+// flow-typed signature: 6a5610678d4b01e13bbfbbc62bdaf583
+// flow-typed version: 3817bc6980/flow-bin_v0.x.x/flow_>=v0.25.x
+
+declare module "flow-bin" {
+  declare module.exports: string;
+}

package.json

   },
   "devDependencies": {
     "babel-core": "6.23.1",
+    "babel-eslint": "7.1.1",
     "babel-loader": "6.3.2",
     "babel-polyfill": "6.23.0",
     "babel-preset-es2015": "6.22.0",
     "eslint": "3.16.1",
+    "eslint-plugin-flowtype": "2.30.0",
+    "flow-bin": "0.38.0",
     "jasmine-core": "2.5.2",
     "jshint": "2.9.4",
     "karma": "0.13.22",
   },
   "scripts": {
     "install": "webpack -p",
-    "lint": "jshint . && eslint .",
+    "lint": "jshint . && eslint . && flow",
     "test": "karma start karma.conf.js",
     "validate": "npm ls"
   },