diff --git a/modules/API/API.js b/modules/API/API.js
index 698735ff8e..8a21b28afd 100644
--- a/modules/API/API.js
+++ b/modules/API/API.js
@@ -1,5 +1,4 @@
-// @flow
-
+/* global APP */
 import Logger from '@jitsi/logger';
 
 import { createApiEvent } from '../../react/features/analytics/AnalyticsEvents';
@@ -114,7 +113,6 @@ import { setTileView, toggleTileView } from '../../react/features/video-layout/a
 import { muteAllParticipants } from '../../react/features/video-menu/actions';
 import { setVideoQuality } from '../../react/features/video-quality/actions';
 import { toggleWhiteboard } from '../../react/features/whiteboard/actions.any';
-import { WhiteboardStatus } from '../../react/features/whiteboard/types';
 import { getJitsiMeetTransport } from '../transport';
 
 import {
@@ -125,8 +123,6 @@ import {
 
 const logger = Logger.getLogger(__filename);
 
-declare var APP: Object;
-
 /**
  * List of the available commands.
  */
@@ -1035,7 +1031,7 @@ function toggleScreenSharing(enable) {
  * @param {MouseEvent} event - The mouse event to sanitize.
  * @returns {Object}
  */
-function sanitizeMouseEvent(event: MouseEvent) {
+function sanitizeMouseEvent(event) {
     const {
         clientX,
         clientY,
@@ -1073,7 +1069,7 @@ function sanitizeMouseEvent(event: MouseEvent) {
  * Jitsi Meet.
  */
 class API {
-    _enabled: boolean;
+    _enabled;
 
     /**
      * Initializes the API. Setups message event listeners that will receive
@@ -1108,7 +1104,7 @@ class API {
      * otherwise.
      * @returns {void}
      */
-    notifyLargeVideoVisibilityChanged(isHidden: boolean) {
+    notifyLargeVideoVisibilityChanged(isHidden) {
         this._sendEvent({
             name: 'large-video-visibility-changed',
             isVisible: !isHidden
@@ -1122,7 +1118,7 @@ class API {
      * @param {Object} event - The message to pass onto spot.
      * @returns {void}
      */
-    sendProxyConnectionEvent(event: Object) {
+    sendProxyConnectionEvent(event) {
         this._sendEvent({
             name: 'proxy-connection-event',
             ...event
@@ -1135,7 +1131,7 @@ class API {
      * @param {Object} event - The event to be sent.
      * @returns {void}
      */
-    _sendEvent(event: Object = {}) {
+    _sendEvent(event = {}) {
         if (this._enabled) {
             transport.sendEvent(event);
         }
@@ -1148,7 +1144,7 @@ class API {
      * @param {boolean} isOpen - True if the chat panel is open.
      * @returns {void}
      */
-    notifyChatUpdated(unreadCount: number, isOpen: boolean) {
+    notifyChatUpdated(unreadCount, isOpen) {
         this._sendEvent({
             name: 'chat-updated',
             unreadCount,
@@ -1163,7 +1159,7 @@ class API {
      * @param {boolean} privateMessage - True if the message was a private message.
      * @returns {void}
      */
-    notifySendingChatMessage(message: string, privateMessage: boolean) {
+    notifySendingChatMessage(message, privateMessage) {
         this._sendEvent({
             name: 'outgoing-message',
             message,
@@ -1177,7 +1173,7 @@ class API {
      * @param {MouseEvent} event - The mousemove event.
      * @returns {void}
      */
-    notifyMouseEnter(event: MouseEvent) {
+    notifyMouseEnter(event) {
         this._sendEvent({
             name: 'mouse-enter',
             event: sanitizeMouseEvent(event)
@@ -1190,7 +1186,7 @@ class API {
      * @param {MouseEvent} event - The mousemove event.
      * @returns {void}
      */
-    notifyMouseLeave(event: MouseEvent) {
+    notifyMouseLeave(event) {
         this._sendEvent({
             name: 'mouse-leave',
             event: sanitizeMouseEvent(event)
@@ -1203,7 +1199,7 @@ class API {
      * @param {MouseEvent} event - The mousemove event.
      * @returns {void}
      */
-    notifyMouseMove(event: MouseEvent) {
+    notifyMouseMove(event) {
         this._sendEvent({
             name: 'mouse-move',
             event: sanitizeMouseEvent(event)
@@ -1217,7 +1213,7 @@ class API {
      * @param {boolean} enabled - Whether or not the new moderation status is enabled.
      * @returns {void}
      */
-    notifyModerationChanged(mediaType: string, enabled: boolean) {
+    notifyModerationChanged(mediaType, enabled) {
         this._sendEvent({
             name: 'moderation-status-changed',
             mediaType,
@@ -1232,7 +1228,7 @@ class API {
      * @param {string} mediaType - Media type for which the participant was approved.
      * @returns {void}
      */
-    notifyParticipantApproved(participantId: string, mediaType: string) {
+    notifyParticipantApproved(participantId, mediaType) {
         this._sendEvent({
             name: 'moderation-participant-approved',
             id: participantId,
@@ -1247,7 +1243,7 @@ class API {
      * @param {string} mediaType - Media type for which the participant was rejected.
      * @returns {void}
      */
-    notifyParticipantRejected(participantId: string, mediaType: string) {
+    notifyParticipantRejected(participantId, mediaType) {
         this._sendEvent({
             name: 'moderation-participant-rejected',
             id: participantId,
@@ -1263,7 +1259,7 @@ class API {
      *
      * @returns {void}
      */
-    notifyNotificationTriggered(title: string, description: string) {
+    notifyNotificationTriggered(title, description) {
         this._sendEvent({
             description,
             name: 'notification-triggered',
@@ -1277,7 +1273,7 @@ class API {
      * @param {number} videoQuality - The video quality. The number represents the maximum height of the video streams.
      * @returns {void}
      */
-    notifyVideoQualityChanged(videoQuality: number) {
+    notifyVideoQualityChanged(videoQuality) {
         this._sendEvent({
             name: 'video-quality-changed',
             videoQuality
@@ -1292,9 +1288,7 @@ class API {
      * @returns {void}
      */
     notifyReceivedChatMessage(
-            { body, id, nick, privateMessage, ts }: {
-                body: *, id: string, nick: string, privateMessage: boolean, ts: *
-            } = {}) {
+            { body, id, nick, privateMessage, ts } = {}) {
         if (APP.conference.isLocalId(id)) {
             return;
         }
@@ -1317,7 +1311,7 @@ class API {
      * @param {Object} props - The display name of the user.
      * @returns {void}
      */
-    notifyUserJoined(id: string, props: Object) {
+    notifyUserJoined(id, props) {
         this._sendEvent({
             name: 'participant-joined',
             id,
@@ -1332,7 +1326,7 @@ class API {
      * @param {string} id - User id.
      * @returns {void}
      */
-    notifyUserLeft(id: string) {
+    notifyUserLeft(id) {
         this._sendEvent({
             name: 'participant-left',
             id
@@ -1347,7 +1341,7 @@ class API {
      * @param {string} role - The new user role.
      * @returns {void}
      */
-    notifyUserRoleChanged(id: string, role: string) {
+    notifyUserRoleChanged(id, role) {
         this._sendEvent({
             name: 'participant-role-changed',
             id,
@@ -1363,7 +1357,7 @@ class API {
      * @param {string} avatarURL - The new avatar URL of the participant.
      * @returns {void}
      */
-    notifyAvatarChanged(id: string, avatarURL: string) {
+    notifyAvatarChanged(id, avatarURL) {
         this._sendEvent({
             name: 'avatar-changed',
             avatarURL,
@@ -1378,7 +1372,7 @@ class API {
      * @param {Object} data - The event data.
      * @returns {void}
      */
-    notifyEndpointTextMessageReceived(data: Object) {
+    notifyEndpointTextMessageReceived(data) {
         this._sendEvent({
             name: 'endpoint-text-message-received',
             data
@@ -1392,7 +1386,7 @@ class API {
      * @param {string} faceExpression - Detected face expression.
      * @returns {void}
      */
-    notifyFaceLandmarkDetected(faceBox: Object, faceExpression: string) {
+    notifyFaceLandmarkDetected(faceBox, faceExpression) {
         this._sendEvent({
             name: 'face-landmark-detected',
             faceBox,
@@ -1406,7 +1400,7 @@ class API {
      * @param {Object} data - The event data.
      * @returns {void}
      */
-    notifySharingParticipantsChanged(data: Object) {
+    notifySharingParticipantsChanged(data) {
         this._sendEvent({
             name: 'content-sharing-participants-changed',
             data
@@ -1420,7 +1414,7 @@ class API {
      * @param {Object} devices - The new device list.
      * @returns {void}
      */
-    notifyDeviceListChanged(devices: Object) {
+    notifyDeviceListChanged(devices) {
         this._sendEvent({
             name: 'device-list-changed',
             devices
@@ -1438,8 +1432,8 @@ class API {
      * @returns {void}
      */
     notifyDisplayNameChanged(
-            id: string,
-            { displayName, formattedDisplayName }: Object) {
+            id,
+            { displayName, formattedDisplayName }) {
         this._sendEvent({
             name: 'display-name-change',
             displayname: displayName,
@@ -1457,8 +1451,8 @@ class API {
      * @returns {void}
      */
     notifyEmailChanged(
-            id: string,
-            { email }: Object) {
+            id,
+            { email }) {
         this._sendEvent({
             name: 'email-change',
             email,
@@ -1470,10 +1464,10 @@ class API {
      * Notify external application (if API is enabled) that the an error has been logged.
      *
      * @param {string} logLevel - The message log level.
-     * @param {Array} args - Array of strings composing the log message.
+     * @param {Array<string>} args - Array of strings composing the log message.
      * @returns {void}
      */
-    notifyLog(logLevel: string, args: Array<string>) {
+    notifyLog(logLevel, args) {
         this._sendEvent({
             name: 'log',
             logLevel,
@@ -1491,7 +1485,7 @@ class API {
      * user and the type of the room.
      * @returns {void}
      */
-    notifyConferenceJoined(roomName: string, id: string, props: Object) {
+    notifyConferenceJoined(roomName, id, props) {
         this._sendEvent({
             name: 'video-conference-joined',
             roomName,
@@ -1506,7 +1500,7 @@ class API {
      * @param {string} roomName - User id.
      * @returns {void}
      */
-    notifyConferenceLeft(roomName: string) {
+    notifyConferenceLeft(roomName) {
         this._sendEvent({
             name: 'video-conference-left',
             roomName
@@ -1521,7 +1515,7 @@ class API {
      *
      * @returns {void}
      */
-    notifyDataChannelClosed(code: number, reason: string) {
+    notifyDataChannelClosed(code, reason) {
         this._sendEvent({
             name: 'data-channel-closed',
             code,
@@ -1564,7 +1558,7 @@ class API {
      * @param {boolean} muted - The new muted status.
      * @returns {void}
      */
-    notifyAudioMutedStatusChanged(muted: boolean) {
+    notifyAudioMutedStatusChanged(muted) {
         this._sendEvent({
             name: 'audio-mute-status-changed',
             muted
@@ -1578,7 +1572,7 @@ class API {
      * @param {boolean} muted - The new muted status.
      * @returns {void}
      */
-    notifyVideoMutedStatusChanged(muted: boolean) {
+    notifyVideoMutedStatusChanged(muted) {
         this._sendEvent({
             name: 'video-mute-status-changed',
             muted
@@ -1592,7 +1586,7 @@ class API {
      * @param {boolean} available - True if available and false otherwise.
      * @returns {void}
      */
-    notifyAudioAvailabilityChanged(available: boolean) {
+    notifyAudioAvailabilityChanged(available) {
         audioAvailable = available;
         this._sendEvent({
             name: 'audio-availability-changed',
@@ -1607,7 +1601,7 @@ class API {
      * @param {boolean} available - True if available and false otherwise.
      * @returns {void}
      */
-    notifyVideoAvailabilityChanged(available: boolean) {
+    notifyVideoAvailabilityChanged(available) {
         videoAvailable = available;
         this._sendEvent({
             name: 'video-availability-changed',
@@ -1622,7 +1616,7 @@ class API {
      * @param {string} id - User id of the new on stage participant.
      * @returns {void}
      */
-    notifyOnStageParticipantChanged(id: string) {
+    notifyOnStageParticipantChanged(id) {
         this._sendEvent({
             name: 'on-stage-participant-changed',
             id
@@ -1636,7 +1630,7 @@ class API {
      * @param {boolean} isVisible - Whether the prejoin video is visible.
      * @returns {void}
      */
-    notifyPrejoinVideoVisibilityChanged(isVisible: boolean) {
+    notifyPrejoinVideoVisibilityChanged(isVisible) {
         this._sendEvent({
             name: 'on-prejoin-video-changed',
             isVisible
@@ -1670,7 +1664,7 @@ class API {
      * @param {string} message - Additional information about the error.
      * @returns {void}
      */
-    notifyOnCameraError(type: string, message: string) {
+    notifyOnCameraError(type, message) {
         this._sendEvent({
             name: 'camera-error',
             type,
@@ -1686,7 +1680,7 @@ class API {
      * @param {string} message - Additional information about the error.
      * @returns {void}
      */
-    notifyOnMicError(type: string, message: string) {
+    notifyOnMicError(type, message) {
         this._sendEvent({
             name: 'mic-error',
             type,
@@ -1702,7 +1696,7 @@ class API {
      * @param {string} error - A failure message, if any.
      * @returns {void}
      */
-    notifyFeedbackSubmitted(error: string) {
+    notifyFeedbackSubmitted(error) {
         this._sendEvent({
             name: 'feedback-submitted',
             error
@@ -1727,7 +1721,7 @@ class API {
      * be displayed or hidden.
      * @returns {void}
      */
-    notifyFilmstripDisplayChanged(visible: boolean) {
+    notifyFilmstripDisplayChanged(visible) {
         this._sendEvent({
             name: 'filmstrip-display-changed',
             visible
@@ -1744,7 +1738,7 @@ class API {
      * other participant.
      * @returns {void}
      */
-    notifyKickedOut(kicked: Object, kicker: Object) {
+    notifyKickedOut(kicked, kicker) {
         this._sendEvent({
             name: 'participant-kicked-out',
             kicked,
@@ -1773,7 +1767,7 @@ class API {
      * share is capturing.
      * @returns {void}
      */
-    notifyScreenSharingStatusChanged(on: boolean, details: Object) {
+    notifyScreenSharingStatusChanged(on, details) {
         this._sendEvent({
             name: 'screen-sharing-status-changed',
             on,
@@ -1788,7 +1782,7 @@ class API {
      * @param {string} id - Id of the dominant participant.
      * @returns {void}
      */
-    notifyDominantSpeakerChanged(id: string) {
+    notifyDominantSpeakerChanged(id) {
         this._sendEvent({
             name: 'dominant-speaker-changed',
             id
@@ -1802,7 +1796,7 @@ class API {
      * @param {string} subject - Conference subject.
      * @returns {void}
      */
-    notifySubjectChanged(subject: string) {
+    notifySubjectChanged(subject) {
         this._sendEvent({
             name: 'subject-change',
             subject
@@ -1817,7 +1811,7 @@ class API {
      * otherwise.
      * @returns {void}
      */
-    notifyTileViewChanged(enabled: boolean) {
+    notifyTileViewChanged(enabled) {
         this._sendEvent({
             name: 'tile-view-changed',
             enabled
@@ -1830,7 +1824,7 @@ class API {
      * @param {string} localStorageContent - The new localStorageContent.
      * @returns {void}
      */
-    notifyLocalStorageChanged(localStorageContent: string) {
+    notifyLocalStorageChanged(localStorageContent) {
         this._sendEvent({
             name: 'local-storage-changed',
             localStorageContent
@@ -1844,7 +1838,7 @@ class API {
      * @param {boolean} handRaised - Whether user has raised hand.
      * @returns {void}
      */
-    notifyRaiseHandUpdated(id: string, handRaised: boolean) {
+    notifyRaiseHandUpdated(id, handRaised) {
         this._sendEvent({
             name: 'raise-hand-updated',
             handRaised,
@@ -1860,7 +1854,7 @@ class API {
      * @param {string} error - Error type or null if success.
      * @returns {void}
      */
-    notifyRecordingStatusChanged(on: boolean, mode: string, error?: string) {
+    notifyRecordingStatusChanged(on, mode, error) {
         this._sendEvent({
             name: 'recording-status-changed',
             on,
@@ -1877,7 +1871,7 @@ class API {
      * @param {number} ttl - The recording download link time to live.
      * @returns {void}
      */
-    notifyRecordingLinkAvailable(link: string, ttl: number) {
+    notifyRecordingLinkAvailable(link, ttl) {
         this._sendEvent({
             name: 'recording-link-available',
             link,
@@ -1891,7 +1885,7 @@ class API {
      * @param {Object} participant - Participant data such as id and name.
      * @returns {void}
      */
-    notifyKnockingParticipant(participant: Object) {
+    notifyKnockingParticipant(participant) {
         this._sendEvent({
             name: 'knocking-participant',
             participant
@@ -1904,7 +1898,7 @@ class API {
      * @param {Object} error - The error.
      * @returns {void}
      */
-    notifyError(error: Object) {
+    notifyError(error) {
         this._sendEvent({
             name: 'error-occurred',
             error
@@ -1918,7 +1912,7 @@ class API {
      * @param {boolean} preventExecution - Whether execution of the button click was prevented or not.
      * @returns {void}
      */
-    notifyToolbarButtonClicked(key: string, preventExecution: boolean) {
+    notifyToolbarButtonClicked(key, preventExecution) {
         this._sendEvent({
             name: 'toolbar-button-clicked',
             key,
@@ -1932,7 +1926,7 @@ class API {
      * @param {boolean} supported - If browser is supported or not.
      * @returns {void}
      */
-    notifyBrowserSupport(supported: boolean) {
+    notifyBrowserSupport(supported) {
         this._sendEvent({
             name: 'browser-support',
             supported
@@ -2026,7 +2020,7 @@ class API {
      * @param {WhiteboardStatus} status - The new whiteboard status.
      * @returns {void}
      */
-    notifyWhiteboardStatusChanged(status: WhiteboardStatus) {
+    notifyWhiteboardStatusChanged(status) {
         this._sendEvent({
             name: 'whiteboard-status-changed',
             status
diff --git a/modules/API/external/functions.js b/modules/API/external/functions.js
index 144c666ae7..d0cc474f87 100644
--- a/modules/API/external/functions.js
+++ b/modules/API/external/functions.js
@@ -1,5 +1,3 @@
-// @flow
-
 import Logger from '@jitsi/logger';
 
 const logger = Logger.getLogger(__filename);
@@ -11,7 +9,7 @@ const logger = Logger.getLogger(__filename);
  * the external communication.
  * @returns {Promise}
  */
-export function getAvailableDevices(transport: Object) {
+export function getAvailableDevices(transport) {
     return transport.sendRequest({
         type: 'devices',
         name: 'getAvailableDevices'
@@ -29,7 +27,7 @@ export function getAvailableDevices(transport: Object) {
  * the external communication.
  * @returns {Promise}
  */
-export function getCurrentDevices(transport: Object) {
+export function getCurrentDevices(transport) {
     return transport.sendRequest({
         type: 'devices',
         name: 'getCurrentDevices'
@@ -50,7 +48,7 @@ export function getCurrentDevices(transport: Object) {
  * Default - 'input'.
  * @returns {Promise}
  */
-export function isDeviceChangeAvailable(transport: Object, deviceType: string) {
+export function isDeviceChangeAvailable(transport, deviceType) {
     return transport.sendRequest({
         deviceType,
         type: 'devices',
@@ -66,7 +64,7 @@ export function isDeviceChangeAvailable(transport: Object, deviceType: string) {
  * the external communication.
  * @returns {Promise}
  */
-export function isDeviceListAvailable(transport: Object) {
+export function isDeviceListAvailable(transport) {
     return transport.sendRequest({
         type: 'devices',
         name: 'isDeviceListAvailable'
@@ -81,7 +79,7 @@ export function isDeviceListAvailable(transport: Object) {
  * the external communication.
  * @returns {Promise}
  */
-export function isMultipleAudioInputSupported(transport: Object) {
+export function isMultipleAudioInputSupported(transport) {
     return transport.sendRequest({
         type: 'devices',
         name: 'isMultipleAudioInputSupported'
@@ -97,7 +95,7 @@ export function isMultipleAudioInputSupported(transport: Object) {
  * @param {string} id - The id of the new device.
  * @returns {Promise}
  */
-export function setAudioInputDevice(transport: Object, label: string, id: string) {
+export function setAudioInputDevice(transport, label, id) {
     return _setDevice(transport, {
         id,
         kind: 'audioinput',
@@ -114,7 +112,7 @@ export function setAudioInputDevice(transport: Object, label: string, id: string
  * @param {string} id - The id of the new device.
  * @returns {Promise}
  */
-export function setAudioOutputDevice(transport: Object, label: string, id: string) {
+export function setAudioOutputDevice(transport, label, id) {
     return _setDevice(transport, {
         id,
         kind: 'audiooutput',
@@ -130,7 +128,7 @@ export function setAudioOutputDevice(transport: Object, label: string, id: strin
  * @param {Object} device - The new device to be used.
  * @returns {Promise}
  */
-function _setDevice(transport: Object, device) {
+function _setDevice(transport, device) {
     return transport.sendRequest({
         type: 'devices',
         name: 'setDevice',
@@ -147,7 +145,7 @@ function _setDevice(transport: Object, device) {
  * @param {string} id - The id of the new device.
  * @returns {Promise}
  */
-export function setVideoInputDevice(transport: Object, label: string, id: string) {
+export function setVideoInputDevice(transport, label, id) {
     return _setDevice(transport, {
         id,
         kind: 'videoinput',
diff --git a/modules/UI/authentication/AuthHandler.js b/modules/UI/authentication/AuthHandler.js
index 68529e8b7f..4b59d94ff0 100644
--- a/modules/UI/authentication/AuthHandler.js
+++ b/modules/UI/authentication/AuthHandler.js
@@ -1,5 +1,4 @@
-// @flow
-
+/* global APP */
 import Logger from '@jitsi/logger';
 
 import { openConnection } from '../../../connection';
@@ -23,7 +22,6 @@ import ExternalLoginDialog from './LoginDialog';
 
 
 let externalAuthWindow;
-declare var APP: Object;
 
 const logger = Logger.getLogger(__filename);
 
@@ -77,7 +75,7 @@ function doExternalAuth(room, lockPassword) {
  * back with "?jwt={the JWT token}" query parameter added.
  * @param {string} [roomName] the name of the conference room.
  */
-export function redirectToTokenAuthService(roomName: string) {
+export function redirectToTokenAuthService(roomName) {
     const config = APP.store.getState()['features/base/config'];
 
     // FIXME: This method will not preserve the other URL params that were
@@ -174,7 +172,7 @@ function initJWTTokenListener(room) {
  * @param {JitsiConference} room
  * @param {string} [lockPassword] password to use if the conference is locked
  */
-function authenticate(room: Object, lockPassword: string) {
+function authenticate(room, lockPassword) {
     const config = APP.store.getState()['features/base/config'];
 
     if (isTokenAuthEnabled(config) || room.isExternalAuthEnabled()) {
@@ -189,7 +187,7 @@ function authenticate(room: Object, lockPassword: string) {
  * @param {JitsiConference} room
  * @param {string} [lockPassword] password to use if the conference is locked
  */
-function requireAuth(room: Object, lockPassword: string) {
+function requireAuth(room, lockPassword) {
     if (isDialogOpen(APP.store, WaitForOwnerDialog) || isDialogOpen(APP.store, LoginDialog)) {
         return;
     }
@@ -207,7 +205,7 @@ function requireAuth(room: Object, lockPassword: string) {
  * @param {string} [lockPassword] password to use if the conference is locked
  * @returns {Promise}
  */
-function logout(room: Object) {
+function logout(room) {
     return new Promise(resolve => {
         room.room.moderator.logout(resolve);
     }).then(url => {
diff --git a/modules/UI/authentication/LoginDialog.js b/modules/UI/authentication/LoginDialog.js
index f544e08098..e91e9a04ba 100644
--- a/modules/UI/authentication/LoginDialog.js
+++ b/modules/UI/authentication/LoginDialog.js
@@ -1,6 +1,4 @@
-// @flow
-
-declare var APP: Object;
+/* global APP */
 
 export default {
 
@@ -10,7 +8,7 @@ export default {
      * @param {function} callback - callback to invoke when auth popup is closed.
      * @returns auth dialog
      */
-    showExternalAuthDialog(url: string, callback: ?Function) {
+    showExternalAuthDialog(url, callback) {
         const dialog = APP.UI.messageHandler.openCenteredPopup(
             url, 910, 660,
 
diff --git a/modules/translation/translation.js b/modules/translation/translation.js
index c25f365445..20e6c62c52 100644
--- a/modules/translation/translation.js
+++ b/modules/translation/translation.js
@@ -1,15 +1,8 @@
-/*  @flow */
-
 import $ from 'jquery';
 import jqueryI18next from 'jquery-i18next';
 
 import i18next from '../../react/features/base/i18n/i18next';
 
-
-type DocumentElement = {
-    lang: string
-}
-
 /**
  * Notifies that the {@link i18next} instance has finished its initialization.
  *
@@ -18,7 +11,7 @@ type DocumentElement = {
  */
 function _onI18nInitialized() {
 
-    const documentElement: DocumentElement
+    const documentElement
         = document.documentElement || {};
 
     $('[data-i18n]').localize();
@@ -47,7 +40,7 @@ class Translation {
     /**
      *
      */
-    generateTranslationHTML(key: string, options: Object) {
+    generateTranslationHTML(key, options) {
         const optAttr
             = options ? ` data-i18n-options='${JSON.stringify(options)}'` : '';
 
@@ -60,7 +53,7 @@ class Translation {
     /**
      *
      */
-    translateElement(selector: Object, options: Object) {
+    translateElement(selector, options) {
         // XXX i18next expects undefined if options are missing.
         selector.localize(options ? options : undefined);
     }
diff --git a/package-lock.json b/package-lock.json
index 2fefe419ce..3a64015a01 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -123,7 +123,6 @@
         "@babel/eslint-parser": "7.21.8",
         "@babel/plugin-proposal-export-default-from": "7.16.0",
         "@babel/preset-env": "7.16.0",
-        "@babel/preset-flow": "7.16.0",
         "@babel/preset-react": "7.16.0",
         "@jitsi/eslint-config": "4.1.5",
         "@types/amplitude-js": "8.16.2",
@@ -153,7 +152,6 @@
         "clean-css-cli": "4.3.0",
         "css-loader": "3.6.0",
         "eslint": "8.40.0",
-        "eslint-plugin-flowtype": "8.0.3",
         "eslint-plugin-import": "2.27.5",
         "eslint-plugin-jsdoc": "37.0.3",
         "eslint-plugin-react": "7.32.2",
@@ -9375,24 +9373,6 @@
         "ms": "^2.1.1"
       }
     },
-    "node_modules/eslint-plugin-flowtype": {
-      "version": "8.0.3",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-flowtype/-/eslint-plugin-flowtype-8.0.3.tgz",
-      "integrity": "sha512-dX8l6qUL6O+fYPtpNRideCFSpmWOUVx5QcaGLVqe/vlDiBSe4vYljDWDETwnyFzpl7By/WVIu6rcrniCgH9BqQ==",
-      "dev": true,
-      "dependencies": {
-        "lodash": "^4.17.21",
-        "string-natural-compare": "^3.0.1"
-      },
-      "engines": {
-        "node": ">=12.0.0"
-      },
-      "peerDependencies": {
-        "@babel/plugin-syntax-flow": "^7.14.5",
-        "@babel/plugin-transform-react-jsx": "^7.14.9",
-        "eslint": "^8.1.0"
-      }
-    },
     "node_modules/eslint-plugin-import": {
       "version": "2.27.5",
       "resolved": "https://registry.npmjs.org/eslint-plugin-import/-/eslint-plugin-import-2.27.5.tgz",
@@ -17593,12 +17573,6 @@
         }
       ]
     },
-    "node_modules/string-natural-compare": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/string-natural-compare/-/string-natural-compare-3.0.1.tgz",
-      "integrity": "sha512-n3sPwynL1nwKi3WJ6AIsClwBMa0zTi54fn2oLU6ndfTSIO05xaznjSf15PcBZU6FNWbmN5Q6cxT4V5hGvB4taw==",
-      "dev": true
-    },
     "node_modules/string-replace-to-array": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/string-replace-to-array/-/string-replace-to-array-1.0.3.tgz",
@@ -26915,16 +26889,6 @@
         }
       }
     },
-    "eslint-plugin-flowtype": {
-      "version": "8.0.3",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-flowtype/-/eslint-plugin-flowtype-8.0.3.tgz",
-      "integrity": "sha512-dX8l6qUL6O+fYPtpNRideCFSpmWOUVx5QcaGLVqe/vlDiBSe4vYljDWDETwnyFzpl7By/WVIu6rcrniCgH9BqQ==",
-      "dev": true,
-      "requires": {
-        "lodash": "^4.17.21",
-        "string-natural-compare": "^3.0.1"
-      }
-    },
     "eslint-plugin-import": {
       "version": "2.27.5",
       "resolved": "https://registry.npmjs.org/eslint-plugin-import/-/eslint-plugin-import-2.27.5.tgz",
@@ -32987,12 +32951,6 @@
         }
       }
     },
-    "string-natural-compare": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/string-natural-compare/-/string-natural-compare-3.0.1.tgz",
-      "integrity": "sha512-n3sPwynL1nwKi3WJ6AIsClwBMa0zTi54fn2oLU6ndfTSIO05xaznjSf15PcBZU6FNWbmN5Q6cxT4V5hGvB4taw==",
-      "dev": true
-    },
     "string-replace-to-array": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/string-replace-to-array/-/string-replace-to-array-1.0.3.tgz",
diff --git a/package.json b/package.json
index 59686f5a1f..1afd5d5ba9 100644
--- a/package.json
+++ b/package.json
@@ -128,7 +128,6 @@
     "@babel/eslint-parser": "7.21.8",
     "@babel/plugin-proposal-export-default-from": "7.16.0",
     "@babel/preset-env": "7.16.0",
-    "@babel/preset-flow": "7.16.0",
     "@babel/preset-react": "7.16.0",
     "@jitsi/eslint-config": "4.1.5",
     "@types/amplitude-js": "8.16.2",
@@ -158,7 +157,6 @@
     "clean-css-cli": "4.3.0",
     "css-loader": "3.6.0",
     "eslint": "8.40.0",
-    "eslint-plugin-flowtype": "8.0.3",
     "eslint-plugin-import": "2.27.5",
     "eslint-plugin-jsdoc": "37.0.3",
     "eslint-plugin-react": "7.32.2",
diff --git a/patches/eslint-plugin-flowtype+8.0.3.patch b/patches/eslint-plugin-flowtype+8.0.3.patch
deleted file mode 100644
index 04ae68da91..0000000000
--- a/patches/eslint-plugin-flowtype+8.0.3.patch
+++ /dev/null
@@ -1,11 +0,0 @@
-diff --git a/node_modules/eslint-plugin-flowtype/dist/configs/recommended.json b/node_modules/eslint-plugin-flowtype/dist/configs/recommended.json
-index 90a0d69..2ad7d68 100644
---- a/node_modules/eslint-plugin-flowtype/dist/configs/recommended.json
-+++ b/node_modules/eslint-plugin-flowtype/dist/configs/recommended.json
-@@ -1,5 +1,5 @@
- {
--  "parser": "@babel/eslint",
-+  "parser": "@babel/eslint-parser",
-   "parserOptions": {
-     "babelOptions": {
-       "plugins": [
diff --git a/react/.eslintrc.js b/react/.eslintrc.js
index 052ee25245..625382ea4c 100644
--- a/react/.eslintrc.js
+++ b/react/.eslintrc.js
@@ -1,7 +1,6 @@
 module.exports = {
     'extends': [
         '../.eslintrc.js',
-        '@jitsi/eslint-config/flow',
         '@jitsi/eslint-config/jsdoc',
         '@jitsi/eslint-config/react',
         '.eslintrc-react-native.js'
@@ -30,15 +29,10 @@ module.exports = {
         }
     ],
     'rules': {
-        'flowtype/no-types-missing-file-annotation': 0,
-
         // XXX remove this eventually.
         'react/jsx-indent-props': 0
     },
     'settings': {
-        'flowtype': {
-            'onlyFilesWithFlowAnnotation': true
-        },
         'react': {
             'version': 'detect'
         }
diff --git a/react/features/google-api/googleApi.native.js b/react/features/google-api/googleApi.native.js
index 5de48c197a..5d8b39bb05 100644
--- a/react/features/google-api/googleApi.native.js
+++ b/react/features/google-api/googleApi.native.js
@@ -1,5 +1,3 @@
-// @flow
-
 import { NativeModules } from 'react-native';
 
 let GoogleSignin;
@@ -29,7 +27,7 @@ class GoogleApi {
      * {@code GoogleSignin.configure}.
      * @returns {void}
      */
-    configure(config: Object) {
+    configure(config) {
         if (GoogleSignin) {
             GoogleSignin.configure(config);
         }
@@ -40,7 +38,7 @@ class GoogleApi {
      *
      * @returns {Promise}
      */
-    getTokens(): Promise<*> {
+    getTokens() {
         return GoogleSignin.getTokens();
     }
 
@@ -51,7 +49,7 @@ class GoogleApi {
      * @param {string} accessToken - The Google auth token.
      * @returns {Promise}
      */
-    getYouTubeLiveStreams(accessToken: string): Promise<*> {
+    getYouTubeLiveStreams(accessToken) {
         return new Promise((resolve, reject) => {
 
             // Fetching the list of available broadcasts first.
@@ -116,7 +114,7 @@ class GoogleApi {
      * params if needed.
      * @returns {Promise}
      */
-    _fetchGoogleEndpoint(accessToken, endpoint): Promise<*> {
+    _fetchGoogleEndpoint(accessToken, endpoint) {
         return new Promise((resolve, reject) => {
             const headers = {
                 Authorization: `Bearer ${accessToken}`
@@ -145,7 +143,7 @@ class GoogleApi {
      * to retrieve streams for.
      * @returns {Promise}
      */
-    _getLiveStreamsForBroadcasts(accessToken, broadcasts): Promise<*> {
+    _getLiveStreamsForBroadcasts(accessToken, broadcasts) {
         return new Promise((resolve, reject) => {
             const ids = [];
 
diff --git a/react/features/google-api/googleApi.web.js b/react/features/google-api/googleApi.web.js
index bc21900390..846efae150 100644
--- a/react/features/google-api/googleApi.web.js
+++ b/react/features/google-api/googleApi.web.js
@@ -209,7 +209,7 @@ const googleApi = {
      * @param {boolean} consent - Whether to show account selection dialog.
      * @returns {Promise}
      */
-    showAccountSelection(consent: boolean) {
+    showAccountSelection(consent) {
         return this.get()
             .then(api => new Promise((resolve, reject) => {
                 try {
@@ -244,7 +244,7 @@ const googleApi = {
      * @param {boolean} consent - Whether to show account selection dialog.
      * @returns {Promise}
      */
-    signInIfNotSignedIn(consent: boolean) {
+    signInIfNotSignedIn(consent) {
         return this.get()
             .then(() => this.isSignedIn())
             .then(isSignedIn => {
diff --git a/react/features/mobile/polyfills/RTCPeerConnection.js b/react/features/mobile/polyfills/RTCPeerConnection.js
index 55ade67a46..ee9bfcbc08 100644
--- a/react/features/mobile/polyfills/RTCPeerConnection.js
+++ b/react/features/mobile/polyfills/RTCPeerConnection.js
@@ -1,5 +1,3 @@
-// @flow
-
 import { RTCPeerConnection as PC } from 'react-native-webrtc';
 
 import { synthesizeIPv6Addresses } from './ipv6utils';
@@ -15,7 +13,7 @@ export default class RTCPeerConnection extends PC {
      * @param {Object} description - SDP.
      * @returns {Promise<undefined>} A promise which is resolved once the operation is complete.
      */
-    async setRemoteDescription(description: Object) {
+    async setRemoteDescription(description) {
         return super.setRemoteDescription(await synthesizeIPv6Addresses(description));
     }
 }
diff --git a/react/features/mobile/polyfills/ipv6utils.js b/react/features/mobile/polyfills/ipv6utils.js
index ee063b4858..ca108e29ca 100644
--- a/react/features/mobile/polyfills/ipv6utils.js
+++ b/react/features/mobile/polyfills/ipv6utils.js
@@ -1,5 +1,3 @@
-// @flow
-
 import { NativeModules } from 'react-native';
 import { RTCSessionDescription } from 'react-native-webrtc';
 
@@ -11,7 +9,7 @@ import { RTCSessionDescription } from 'react-native-webrtc';
  * @private
  * @returns {Promise}
  */
-export function synthesizeIPv6Addresses(sdp: RTCSessionDescription) {
+export function synthesizeIPv6Addresses(sdp) {
     return (
         new Promise(resolve => resolve(_synthesizeIPv6Addresses0(sdp)))
             .then(({ ips, lines }) =>
@@ -32,7 +30,7 @@ export function synthesizeIPv6Addresses(sdp: RTCSessionDescription) {
  * be treated as inability to synthesize an IPv6 address from the specified
  * {@code ipv4}.
  */
-const _synthesizeIPv6FromIPv4Address: string => Promise<?string> = (function() {
+const _synthesizeIPv6FromIPv4Address = (function() {
     // POSIX.getaddrinfo
     const { POSIX } = NativeModules;
 
diff --git a/react/features/screenshot-capture/processScreenshot.js b/react/features/screenshot-capture/processScreenshot.js
index bde8577f94..2b7f2b5863 100644
--- a/react/features/screenshot-capture/processScreenshot.js
+++ b/react/features/screenshot-capture/processScreenshot.js
@@ -1,5 +1,3 @@
-// @flow
-
 /**
  * Helper method used to process screenshots captured by the {@code ScreenshotCaptureEffect}.
  *
@@ -7,6 +5,6 @@
  * @param {Object} options - Custom options required for processing.
  * @returns {void}
  */
-export function processScreenshot(canvas: HTMLCanvasElement, options: Object) { // eslint-disable-line no-unused-vars
+export function processScreenshot(canvas, options) { // eslint-disable-line no-unused-vars
     return;
 }
diff --git a/react/index.native.js b/react/index.native.js
index 0132be91ac..7afea6ff17 100644
--- a/react/index.native.js
+++ b/react/index.native.js
@@ -1,5 +1,3 @@
-// @flow
-
 // https://github.com/software-mansion/react-native-gesture-handler/issues/320#issuecomment-443815828
 import 'react-native-gesture-handler';
 
@@ -15,17 +13,6 @@ import { App } from './features/app/components/App.native';
 import { _initLogging } from './features/base/logging/functions';
 import JitsiThemePaperProvider from './features/base/ui/components/JitsiThemeProvider';
 
-/**
- * The type of the React {@code Component} props of {@link Root}.
- */
-type Props = {
-
-    /**
-     * The URL, if any, with which the app was launched.
-     */
-    url: Object | string
-};
-
 /**
  * React Native doesn't support specifying props to the main/root component (in
  * the JS/JSX source code). So create a wrapper React Component (class) around
@@ -33,7 +20,7 @@ type Props = {
  *
  * @augments Component
  */
-class Root extends PureComponent<Props> {
+class Root extends PureComponent {
     /**
      * Implements React's {@link Component#render()}.
      *
diff --git a/webpack.config.js b/webpack.config.js
index d5146227ff..297070fae4 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -136,7 +136,6 @@ function getConfig(options = {}) {
 
                             }
                         ],
-                        require.resolve('@babel/preset-flow'),
                         require.resolve('@babel/preset-react')
                     ]
                 },