diff --git a/conference.js b/conference.js
index 8a91e98749..314ae3d24b 100644
--- a/conference.js
+++ b/conference.js
@@ -2320,13 +2320,14 @@ export default {
      * @private
      */
     _initDeviceList() {
-        if (JitsiMeetJS.mediaDevices.isDeviceListAvailable()
-                && JitsiMeetJS.mediaDevices.isDeviceChangeAvailable()) {
-            JitsiMeetJS.mediaDevices.enumerateDevices(devices => {
-                // Ugly way to synchronize real device IDs with local
-                // storage and settings menu. This is a workaround until
-                // getConstraints() method will be implemented
-                // in browsers.
+        const { mediaDevices } = JitsiMeetJS;
+
+        if (mediaDevices.isDeviceListAvailable()
+                && mediaDevices.isDeviceChangeAvailable()) {
+            mediaDevices.enumerateDevices(devices => {
+                // Ugly way to synchronize real device IDs with local storage
+                // and settings menu. This is a workaround until
+                // getConstraints() method will be implemented in browsers.
                 const { dispatch } = APP.store;
 
                 if (this.localAudio) {
@@ -2334,7 +2335,6 @@ export default {
                         micDeviceId: this.localAudio.getDeviceId()
                     }));
                 }
-
                 if (this.localVideo) {
                     dispatch(updateSettings({
                         cameraDeviceId: this.localVideo.getDeviceId()
@@ -2347,9 +2347,8 @@ export default {
             });
 
             this.deviceChangeListener = devices =>
-                window.setTimeout(
-                    () => this._onDeviceListChanged(devices), 0);
-            JitsiMeetJS.mediaDevices.addEventListener(
+                window.setTimeout(() => this._onDeviceListChanged(devices), 0);
+            mediaDevices.addEventListener(
                 JitsiMediaDevicesEvents.DEVICE_LIST_CHANGED,
                 this.deviceChangeListener);
         }
diff --git a/react/features/app/actions.js b/react/features/app/actions.js
index cd3e75615f..4e5736393f 100644
--- a/react/features/app/actions.js
+++ b/react/features/app/actions.js
@@ -78,10 +78,10 @@ function _appNavigateToMandatoryLocation(
      */
     function loadConfigSettled(error, config) {
         // Due to the asynchronous nature of the loading, the specified config
-        // may or may not be required by the time the notification arrives.
-        // If we receive the config for a location we are no longer interested
-        // in, "ignore" it - deliver it to the external API, for example, but do
-        // not proceed with the appNavigate procedure/process.
+        // may or may not be required by the time the notification arrives. If
+        // we receive the config for a location we are no longer interested in,
+        // "ignore" it - deliver it to the external API, for example, but do not
+        // proceed with the appNavigate procedure/process.
         if (getState()['features/base/config'].locationURL === locationURL) {
             dispatch(setLocationURL(locationURL));
             dispatch(setConfig(config));
@@ -90,8 +90,8 @@ function _appNavigateToMandatoryLocation(
             error || (error = new Error('Config no longer needed!'));
 
             // XXX The failure could be, for example, because of a
-            // certificate-related error. In which case the connection will
-            // fail later in Strophe anyway.
+            // certificate-related error. In which case the connection will fail
+            // later in Strophe anyway.
             dispatch(loadConfigError(error, locationURL));
 
             throw error;
diff --git a/react/features/app/components/AbstractApp.js b/react/features/app/components/AbstractApp.js
index 1893b4f0b9..7bb48ece7c 100644
--- a/react/features/app/components/AbstractApp.js
+++ b/react/features/app/components/AbstractApp.js
@@ -23,8 +23,8 @@ import { OverlayContainer } from '../../overlay';
 import { appNavigate, appWillMount, appWillUnmount } from '../actions';
 
 /**
- * The default URL to open if no other was specified to {@code AbstractApp}
- * via props.
+ * The default URL to open if no other was specified to {@code AbstractApp} via
+ * props.
  *
  * FIXME: This is not at the best place here. This should be either in the
  * base/settings feature or a default in base/config.
@@ -78,6 +78,12 @@ export class AbstractApp extends Component {
 
         this.state = {
 
+            /**
+             * The state of the »possible« async initialization of
+             * the {@code AbstractApp}.
+             */
+            appAsyncInitialized: false,
+
             /**
              * The Route rendered by this {@code AbstractApp}.
              *
@@ -85,12 +91,6 @@ export class AbstractApp extends Component {
              */
             route: {},
 
-            /**
-             * The state of the »possible« async initialization of
-             * the {@code AbstractApp}.
-             */
-            appAsyncInitialized: false,
-
             /**
              * The redux store used by this {@code AbstractApp}.
              *
@@ -239,8 +239,7 @@ export class AbstractApp extends Component {
      * @returns {ReactElement}
      */
     render() {
-        const { appAsyncInitialized, route } = this.state;
-        const { component } = route;
+        const { appAsyncInitialized, route: { component } } = this.state;
 
         if (appAsyncInitialized && component) {
             return (
@@ -357,7 +356,7 @@ export class AbstractApp extends Component {
         return (
             this.props.defaultURL
                 || this._getStore().getState()['features/base/settings']
-                .serverURL
+                    .serverURL
                 || DEFAULT_URL);
     }
 
@@ -435,9 +434,7 @@ export class AbstractApp extends Component {
         // performed before setState completes, the app may not navigate to the
         // expected route. In order to mitigate the problem, _navigate was
         // changed to return a Promise.
-        return new Promise(resolve => {
-            this.setState({ route }, resolve);
-        });
+        return new Promise(resolve => this.setState({ route }, resolve));
     }
 
     /**
diff --git a/react/features/app/functions.native.js b/react/features/app/functions.native.js
index 5387f67a49..6b0e8033e7 100644
--- a/react/features/app/functions.native.js
+++ b/react/features/app/functions.native.js
@@ -3,7 +3,6 @@
 import { NativeModules } from 'react-native';
 
 export * from './functions.any';
-export * from './router';
 
 /**
  * Returns application name.
diff --git a/react/features/app/functions.web.js b/react/features/app/functions.web.js
index 5daf84694a..c2006d46bf 100644
--- a/react/features/app/functions.web.js
+++ b/react/features/app/functions.web.js
@@ -1,7 +1,6 @@
 // @flow
 
 export * from './functions.any';
-export * from './router';
 
 declare var interfaceConfig: Object;
 
diff --git a/react/features/app/router.js b/react/features/app/getRouteToRender.js
similarity index 86%
rename from react/features/app/router.js
rename to react/features/app/getRouteToRender.js
index 52e7415ebf..2287f2217e 100644
--- a/react/features/app/router.js
+++ b/react/features/app/getRouteToRender.js
@@ -1,4 +1,5 @@
 // @flow
+
 import type { Component } from 'react';
 
 import { isRoomValid } from '../base/conference';
@@ -35,11 +36,11 @@ export type Route = {
  * Determines which route is to be rendered in order to depict a specific Redux
  * store.
  *
- * @param {(Object|Function)} stateful - Redux state or Regux getState()
- * method.
+ * @param {(Function|Object)} stateful - THe redux store, state, or
+ * {@code getState} function.
  * @returns {Promise<Route>}
  */
-export function getRouteToRender(stateful: Object | Function): Promise<Route> {
+export function _getRouteToRender(stateful: Function | Object): Promise<Route> {
     const state = toState(stateful);
     const { room } = state['features/base/conference'];
     const isMobileApp = navigator.product === 'ReactNative';
@@ -51,11 +52,11 @@ export function getRouteToRender(stateful: Object | Function): Promise<Route> {
     };
 
     return new Promise(resolve => {
-        // First check if the current endpoint supports WebRTC. We are
+        // First, check if the current endpoint supports WebRTC. We are
         // intentionally not performing the check for mobile browsers because:
-        //   - the welcome page is mobile ready
-        //   - if the URL points to a conference, getDeepLinkingPage will take
-        //     care of it
+        // - the WelcomePage is mobile ready;
+        // - if the URL points to a conference, getDeepLinkingPage will take
+        //   care of it.
         if (!isMobileBrowser && !JitsiMeetJS.isWebRtcSupported()) {
             route.component = UnsupportedDesktopBrowser;
             resolve(route);
@@ -70,8 +71,8 @@ export function getRouteToRender(stateful: Object | Function): Promise<Route> {
             } else {
                 // Update the location if it doesn't match. This happens when a
                 // room is joined from the welcome page. The reason for doing
-                // this instead of using the history API is that we want to
-                // load the config.js which takes the room into account.
+                // this instead of using the history API is that we want to load
+                // the config.js which takes the room into account.
                 const { locationURL } = state['features/base/connection'];
 
                 // eslint-disable-next-line no-negated-condition
@@ -91,8 +92,8 @@ export function getRouteToRender(stateful: Object | Function): Promise<Route> {
         }
 
         if (!isWelcomePageUserEnabled(state)) {
-            // Web: if the welcome page is disabled, go directly to a
-            // random room.
+            // Web: if the welcome page is disabled, go directly to a random
+            // room.
 
             let href = window.location.href;
 
diff --git a/react/features/app/middleware.js b/react/features/app/middleware.js
index faf3ae7e9e..452df63525 100644
--- a/react/features/app/middleware.js
+++ b/react/features/app/middleware.js
@@ -7,7 +7,7 @@ import {
 } from '../base/connection';
 import { MiddlewareRegistry } from '../base/redux';
 
-import { getRouteToRender } from './router';
+import { _getRouteToRender } from './getRouteToRender';
 
 MiddlewareRegistry.register(store => next => action => {
     switch (action.type) {
@@ -74,7 +74,7 @@ function _navigate({ getState }) {
     const state = getState();
     const { app } = state['features/app'];
 
-    getRouteToRender(state).then(route => app._navigate(route));
+    _getRouteToRender(state).then(route => app._navigate(route));
 }
 
 /**
diff --git a/react/features/base/config/functions.js b/react/features/base/config/functions.js
index e73e622d87..58ca66efa6 100644
--- a/react/features/base/config/functions.js
+++ b/react/features/base/config/functions.js
@@ -149,6 +149,24 @@ const logger = require('jitsi-meet-logger').getLogger(__filename);
 export { default as getRoomName } from './getRoomName';
 export { parseURLParams };
 
+/**
+ * Promise wrapper on obtain config method. When HttpConfigFetch will be moved
+ * to React app it's better to use load config instead.
+ *
+ * @param {string} location - URL of the domain from which the config is to be
+ * obtained.
+ * @param {string} room - Room name.
+ * @private
+ * @returns {Promise<void>}
+ */
+export function obtainConfig(location: string, room: string): Promise<void> {
+    return new Promise((resolve, reject) =>
+        _obtainConfig(location, room, (success, error) => {
+            success ? resolve() : reject(error);
+        })
+    );
+}
+
 /**
  * Sends HTTP POST request to specified {@code endpoint}. In request the name
  * of the room is included in JSON format:
@@ -163,10 +181,7 @@ export { parseURLParams };
  * @param {Function} complete - The callback to invoke upon success or failure.
  * @returns {void}
  */
-export function obtainConfig(
-        endpoint: string,
-        roomName: string,
-        complete: Function) {
+function _obtainConfig(endpoint: string, roomName: string, complete: Function) {
     logger.info(`Send config request to ${endpoint} for room: ${roomName}`);
     $.ajax(
         endpoint,
diff --git a/react/features/base/connection/actions.web.js b/react/features/base/connection/actions.web.js
index 5ee29aafb6..35c9792029 100644
--- a/react/features/base/connection/actions.web.js
+++ b/react/features/base/connection/actions.web.js
@@ -20,10 +20,8 @@ export {
  */
 export function connect() {
     return (dispatch: Dispatch<*>, getState: Function) => {
-        const state = getState();
-
         // XXX Lib-jitsi-meet does not accept uppercase letters.
-        const room = state['features/base/conference'].room.toLowerCase();
+        const room = getState()['features/base/conference'].room.toLowerCase();
 
         // XXX For web based version we use conference initialization logic
         // from the old app (at the moment of writing).
diff --git a/react/features/conference/components/Conference.native.js b/react/features/conference/components/Conference.native.js
index a4954f11a8..8382f7ed92 100644
--- a/react/features/conference/components/Conference.native.js
+++ b/react/features/conference/components/Conference.native.js
@@ -184,8 +184,6 @@ class Conference extends Component<Props> {
     componentWillReceiveProps(nextProps: Props) {
         const {
             _locationURL: oldLocationURL,
-            _onConnect,
-            _onDisconnect,
             _participantCount: oldParticipantCount,
             _room: oldRoom,
             _setToolboxVisible
@@ -197,10 +195,10 @@ class Conference extends Component<Props> {
         } = nextProps;
 
         // If the location URL changes we need to reconnect.
-        oldLocationURL !== newLocationURL && _onDisconnect();
+        oldLocationURL !== newLocationURL && this.props._onDisconnect();
 
         // Start the connection process when there is a (valid) room.
-        oldRoom !== newRoom && newRoom && _onConnect();
+        oldRoom !== newRoom && newRoom && this.props._onConnect();
 
         if (oldParticipantCount === 1) {
             newParticipantCount > 1 && _setToolboxVisible(false);
@@ -342,9 +340,7 @@ class Conference extends Component<Props> {
      * @returns {React$Node}
      */
     _renderConferenceNotification() {
-        return ConferenceNotification
-            ? <ConferenceNotification />
-            : undefined;
+        return ConferenceNotification ? <ConferenceNotification /> : undefined;
     }
 }
 
@@ -356,6 +352,7 @@ class Conference extends Component<Props> {
  * @returns {{
  *     _onConnect: Function,
  *     _onDisconnect: Function,
+ *     _onHardwareBackPress: Function,
  *     _setToolboxVisible: Function
  * }}
  */
diff --git a/react/features/conference/components/Conference.web.js b/react/features/conference/components/Conference.web.js
index 6edaf432a6..4a3d17dfe6 100644
--- a/react/features/conference/components/Conference.web.js
+++ b/react/features/conference/components/Conference.web.js
@@ -28,24 +28,6 @@ declare var interfaceConfig: Object;
 
 const logger = require('jitsi-meet-logger').getLogger(__filename);
 
-/**
- * Promise wrapper on obtain config method. When HttpConfigFetch will be moved
- * to React app it's better to use load config instead.
- *
- * @param {string} location - URL of the domain from which the config is to be
- * obtained.
- * @param {string} room - Room name.
- * @private
- * @returns {Promise}
- */
-function _obtainConfig(location: string, room: string) {
-    return new Promise((resolve, reject) =>
-        obtainConfig(location, room, (success, error) => {
-            success ? resolve() : reject(error);
-        })
-    );
-}
-
 /**
  * DOM events for when full screen mode has changed. Different browsers need
  * different vendor prefixes.
@@ -119,7 +101,7 @@ class Conference extends Component<Props> {
         const { configLocation } = config;
 
         if (configLocation) {
-            _obtainConfig(configLocation, this.props._room)
+            obtainConfig(configLocation, this.props._room)
                 .then(() => {
                     const now = window.performance.now();
 
@@ -133,8 +115,8 @@ class Conference extends Component<Props> {
 
                     // Show obtain config error.
                     APP.UI.messageHandler.showError({
-                        titleKey: 'connection.CONNFAIL',
-                        descriptionKey: 'dialog.connectError'
+                        descriptionKey: 'dialog.connectError',
+                        titleKey: 'connection.CONNFAIL'
                     });
                 });
         } else {
@@ -253,7 +235,8 @@ class Conference extends Component<Props> {
  * @param {Object} state - The Redux state.
  * @private
  * @returns {{
- *     _iAmRecorder: boolean
+ *     _iAmRecorder: boolean,
+ *     _room: ?string
  * }}
  */
 function _mapStateToProps(state) {
diff --git a/react/features/welcome/components/BlankPage.native.js b/react/features/welcome/components/BlankPage.native.js
index 2c3b0f04fb..60c5e9a0ef 100644
--- a/react/features/welcome/components/BlankPage.native.js
+++ b/react/features/welcome/components/BlankPage.native.js
@@ -10,11 +10,11 @@ import { NetworkActivityIndicator } from '../../mobile/network-activity';
 import LocalVideoTrackUnderlay from './LocalVideoTrackUnderlay';
 
 /**
- * {@code BlankPage} React {@code Component}'s prop types.
+ * The type of React {@code Component} props of {@link BlankPage}.
  */
 type Props = {
     dispatch: Dispatch<*>
-}
+};
 
 /**
  * The React {@code Component} displayed by {@code AbstractApp} when it has no