diff --git a/app/AppContainer.tsx b/app/AppContainer.tsx
index b73aaf8e3f..441220fec3 100644
--- a/app/AppContainer.tsx
+++ b/app/AppContainer.tsx
@@ -3,7 +3,7 @@ import { NavigationContainer } from '@react-navigation/native';
 import { createStackNavigator } from '@react-navigation/stack';
 import { connect } from 'react-redux';
 
-import { SetUsernameStackParamList, StackParamList } from './navigationTypes';
+import { SetUsernameStackParamList, StackParamList } from './definitions/navigationTypes';
 import Navigation from './lib/Navigation';
 import { defaultHeader, getActiveRouteName, navigationTheme } from './utils/navigation';
 import { ROOT_INSIDE, ROOT_LOADING, ROOT_OUTSIDE, ROOT_SET_USERNAME } from './actions/app';
diff --git a/app/containers/BackgroundContainer/index.tsx b/app/containers/BackgroundContainer/index.tsx
index fbe5d3077a..fc26fe0abd 100644
--- a/app/containers/BackgroundContainer/index.tsx
+++ b/app/containers/BackgroundContainer/index.tsx
@@ -6,9 +6,9 @@ import sharedStyles from '../../views/Styles';
 import { themes } from '../../constants/colors';
 
 interface IBackgroundContainer {
-	text: string;
-	theme: string;
-	loading: boolean;
+	text?: string;
+	theme?: string;
+	loading?: boolean;
 }
 
 const styles = StyleSheet.create({
@@ -35,8 +35,8 @@ const styles = StyleSheet.create({
 const BackgroundContainer = ({ theme, text, loading }: IBackgroundContainer) => (
 	<View style={styles.container}>
 		<ImageBackground source={{ uri: `message_empty_${theme}` }} style={styles.image} />
-		{text ? <Text style={[styles.text, { color: themes[theme].auxiliaryTintColor }]}>{text}</Text> : null}
-		{loading ? <ActivityIndicator style={styles.text} color={themes[theme].auxiliaryTintColor} /> : null}
+		{text ? <Text style={[styles.text, { color: themes[theme!].auxiliaryTintColor }]}>{text}</Text> : null}
+		{loading ? <ActivityIndicator style={styles.text} color={themes[theme!].auxiliaryTintColor} /> : null}
 	</View>
 );
 
diff --git a/app/containers/HeaderButton/Common.tsx b/app/containers/HeaderButton/Common.tsx
index b40543ddb9..0877fb4c66 100644
--- a/app/containers/HeaderButton/Common.tsx
+++ b/app/containers/HeaderButton/Common.tsx
@@ -29,9 +29,9 @@ export const CloseModal = React.memo(
 export const CancelModal = React.memo(({ onPress, testID }: Partial<IHeaderButtonCommon>) => (
 	<Container left>
 		{isIOS ? (
-			<Item title={I18n.t('Cancel')} onPress={onPress} testID={testID} />
+			<Item title={I18n.t('Cancel')} onPress={onPress!} testID={testID} />
 		) : (
-			<Item iconName='close' onPress={onPress} testID={testID} />
+			<Item iconName='close' onPress={onPress!} testID={testID} />
 		)}
 	</Container>
 ));
@@ -39,19 +39,19 @@ export const CancelModal = React.memo(({ onPress, testID }: Partial<IHeaderButto
 // Right
 export const More = React.memo(({ onPress, testID }: Partial<IHeaderButtonCommon>) => (
 	<Container>
-		<Item iconName='kebab' onPress={onPress} testID={testID} />
+		<Item iconName='kebab' onPress={onPress!} testID={testID} />
 	</Container>
 ));
 
 export const Download = React.memo(({ onPress, testID, ...props }: Partial<IHeaderButtonCommon>) => (
 	<Container>
-		<Item iconName='download' onPress={onPress} testID={testID} {...props} />
+		<Item iconName='download' onPress={onPress!} testID={testID} {...props} />
 	</Container>
 ));
 
 export const Preferences = React.memo(({ onPress, testID, ...props }: Partial<IHeaderButtonCommon>) => (
 	<Container>
-		<Item iconName='settings' onPress={onPress} testID={testID} {...props} />
+		<Item iconName='settings' onPress={onPress!} testID={testID} {...props} />
 	</Container>
 ));
 
diff --git a/app/containers/HeaderButton/HeaderButtonItem.tsx b/app/containers/HeaderButton/HeaderButtonItem.tsx
index b350232d0b..08f6b5a3a1 100644
--- a/app/containers/HeaderButton/HeaderButtonItem.tsx
+++ b/app/containers/HeaderButton/HeaderButtonItem.tsx
@@ -8,12 +8,12 @@ import { themes } from '../../constants/colors';
 import sharedStyles from '../../views/Styles';
 
 interface IHeaderButtonItem {
-	title: string;
-	iconName: string;
-	onPress(): void;
-	testID: string;
-	theme: string;
-	badge(): void;
+	title?: string;
+	iconName?: string;
+	onPress: <T>(arg: T) => void;
+	testID?: string;
+	theme?: string;
+	badge?(): void;
 }
 
 export const BUTTON_HIT_SLOP = {
@@ -44,9 +44,9 @@ const Item = ({ title, iconName, onPress, testID, theme, badge }: IHeaderButtonI
 	<Touchable onPress={onPress} testID={testID} hitSlop={BUTTON_HIT_SLOP} style={styles.container}>
 		<>
 			{iconName ? (
-				<CustomIcon name={iconName} size={24} color={themes[theme].headerTintColor} />
+				<CustomIcon name={iconName} size={24} color={themes[theme!].headerTintColor} />
 			) : (
-				<Text style={[styles.title, { color: themes[theme].headerTintColor }]}>{title}</Text>
+				<Text style={[styles.title, { color: themes[theme!].headerTintColor }]}>{title}</Text>
 			)}
 			{badge ? badge() : null}
 		</>
diff --git a/app/containers/List/ListContainer.tsx b/app/containers/List/ListContainer.tsx
index 408310d9f6..deb9c8a710 100644
--- a/app/containers/List/ListContainer.tsx
+++ b/app/containers/List/ListContainer.tsx
@@ -11,10 +11,10 @@ const styles = StyleSheet.create({
 });
 
 interface IListContainer {
-	children: JSX.Element;
+	children: React.ReactNode;
+	testID?: string;
 }
 const ListContainer = React.memo(({ children, ...props }: IListContainer) => (
-	// @ts-ignore
 	<ScrollView
 		contentContainerStyle={styles.container}
 		scrollIndicatorInsets={{ right: 1 }} // https://github.com/facebook/react-native/issues/26610#issuecomment-539843444
diff --git a/app/containers/List/ListHeader.tsx b/app/containers/List/ListHeader.tsx
index 0b67550e36..9a0b977315 100644
--- a/app/containers/List/ListHeader.tsx
+++ b/app/containers/List/ListHeader.tsx
@@ -20,13 +20,13 @@ const styles = StyleSheet.create({
 
 interface IListHeader {
 	title: string;
-	theme: string;
-	translateTitle: boolean;
+	theme?: string;
+	translateTitle?: boolean;
 }
 
 const ListHeader = React.memo(({ title, theme, translateTitle = true }: IListHeader) => (
 	<View style={styles.container}>
-		<Text style={[styles.title, { color: themes[theme].infoText }]} numberOfLines={1}>
+		<Text style={[styles.title, { color: themes[theme!].infoText }]} numberOfLines={1}>
 			{translateTitle ? I18n.t(title) : title}
 		</Text>
 	</View>
diff --git a/app/containers/List/ListIcon.tsx b/app/containers/List/ListIcon.tsx
index 7d569dce7f..71e4fbdf23 100644
--- a/app/containers/List/ListIcon.tsx
+++ b/app/containers/List/ListIcon.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import { StyleSheet, View } from 'react-native';
+import { StyleProp, StyleSheet, View, ViewStyle } from 'react-native';
 
 import { themes } from '../../constants/colors';
 import { CustomIcon } from '../../lib/Icons';
@@ -7,11 +7,11 @@ import { withTheme } from '../../theme';
 import { ICON_SIZE } from './constants';
 
 interface IListIcon {
-	theme: string;
+	theme?: string;
 	name: string;
-	color: string;
-	style: object;
-	testID: string;
+	color?: string;
+	style?: StyleProp<ViewStyle>;
+	testID?: string;
 }
 
 const styles = StyleSheet.create({
@@ -23,7 +23,7 @@ const styles = StyleSheet.create({
 
 const ListIcon = React.memo(({ theme, name, color, style, testID }: IListIcon) => (
 	<View style={[styles.icon, style]}>
-		<CustomIcon name={name} color={color ?? themes[theme].auxiliaryText} size={ICON_SIZE} testID={testID} />
+		<CustomIcon name={name} color={color ?? themes[theme!].auxiliaryText} size={ICON_SIZE} testID={testID} />
 	</View>
 ));
 
diff --git a/app/containers/List/ListInfo.tsx b/app/containers/List/ListInfo.tsx
index bc4f02e334..2bfe68e324 100644
--- a/app/containers/List/ListInfo.tsx
+++ b/app/containers/List/ListInfo.tsx
@@ -20,13 +20,13 @@ const styles = StyleSheet.create({
 
 interface IListHeader {
 	info: string;
-	theme: string;
-	translateInfo: boolean;
+	theme?: string;
+	translateInfo?: boolean;
 }
 
 const ListInfo = React.memo(({ info, theme, translateInfo = true }: IListHeader) => (
 	<View style={styles.container}>
-		<Text style={[styles.text, { color: themes[theme].infoText }]}>{translateInfo ? I18n.t(info) : info}</Text>
+		<Text style={[styles.text, { color: themes[theme!].infoText }]}>{translateInfo ? I18n.t(info) : info}</Text>
 	</View>
 ));
 
diff --git a/app/containers/List/ListItem.tsx b/app/containers/List/ListItem.tsx
index a05eaf9adc..87abfd2dd9 100644
--- a/app/containers/List/ListItem.tsx
+++ b/app/containers/List/ListItem.tsx
@@ -56,11 +56,11 @@ const styles = StyleSheet.create({
 interface IListItemContent {
 	title?: string;
 	subtitle?: string;
-	left?: Function;
-	right?: Function;
+	left?: () => JSX.Element | null;
+	right?: () => JSX.Element | null;
 	disabled?: boolean;
 	testID?: string;
-	theme: string;
+	theme?: string;
 	color?: string;
 	translateTitle?: boolean;
 	translateSubtitle?: boolean;
@@ -89,15 +89,15 @@ const Content = React.memo(
 			{left ? <View style={styles.leftContainer}>{left()}</View> : null}
 			<View style={styles.textContainer}>
 				<View style={styles.textAlertContainer}>
-					<Text style={[styles.title, { color: color || themes[theme].titleText }]} numberOfLines={1}>
+					<Text style={[styles.title, { color: color || themes[theme!].titleText }]} numberOfLines={1}>
 						{translateTitle ? I18n.t(title) : title}
 					</Text>
 					{alert ? (
-						<CustomIcon style={[styles.alertIcon, { color: themes[theme].dangerColor }]} size={ICON_SIZE} name='info' />
+						<CustomIcon style={[styles.alertIcon, { color: themes[theme!].dangerColor }]} size={ICON_SIZE} name='info' />
 					) : null}
 				</View>
 				{subtitle ? (
-					<Text style={[styles.subtitle, { color: themes[theme].auxiliaryText }]} numberOfLines={1}>
+					<Text style={[styles.subtitle, { color: themes[theme!].auxiliaryText }]} numberOfLines={1}>
 						{translateSubtitle ? I18n.t(subtitle) : subtitle}
 					</Text>
 				) : null}
@@ -112,38 +112,39 @@ const Content = React.memo(
 	)
 );
 
-interface IListItemButton {
+interface IListButtonPress {
+	onPress?: Function;
+}
+
+interface IListItemButton extends IListButtonPress {
 	title?: string;
-	onPress: Function;
 	disabled?: boolean;
-	theme: string;
-	backgroundColor: string;
+	theme?: string;
+	backgroundColor?: string;
 	underlayColor?: string;
 }
 
-const Button = React.memo(({ onPress, backgroundColor, underlayColor, ...props }: IListItemButton) => (
+const Button = React.memo<IListItemButton>(({ onPress, backgroundColor, underlayColor, ...props }: IListItemButton) => (
 	<Touch
-		onPress={() => onPress(props.title)}
-		style={{ backgroundColor: backgroundColor || themes[props.theme].backgroundColor }}
+		onPress={() => onPress!(props.title)}
+		style={{ backgroundColor: backgroundColor || themes[props.theme!].backgroundColor }}
 		underlayColor={underlayColor}
 		enabled={!props.disabled}
-		theme={props.theme}>
+		theme={props.theme!}>
 		<Content {...props} />
 	</Touch>
 ));
 
-interface IListItem {
-	onPress: Function;
-	theme: string;
-	backgroundColor: string;
+interface IListItem extends IListItemContent, IListButtonPress {
+	backgroundColor?: string;
 }
 
-const ListItem = React.memo(({ ...props }: IListItem) => {
+const ListItem = React.memo<IListItem>(({ ...props }: IListItem) => {
 	if (props.onPress) {
 		return <Button {...props} />;
 	}
 	return (
-		<View style={{ backgroundColor: props.backgroundColor || themes[props.theme].backgroundColor }}>
+		<View style={{ backgroundColor: props.backgroundColor || themes[props.theme!].backgroundColor }}>
 			<Content {...props} />
 		</View>
 	);
diff --git a/app/containers/List/ListSection.tsx b/app/containers/List/ListSection.tsx
index 7607ad12d7..e334f5f3f3 100644
--- a/app/containers/List/ListSection.tsx
+++ b/app/containers/List/ListSection.tsx
@@ -11,9 +11,9 @@ const styles = StyleSheet.create({
 });
 
 interface IListSection {
-	children: JSX.Element;
-	title: string;
-	translateTitle: boolean;
+	children: React.ReactNode;
+	title?: string;
+	translateTitle?: boolean;
 }
 
 const ListSection = React.memo(({ children, title, translateTitle }: IListSection) => (
diff --git a/app/containers/List/ListSeparator.tsx b/app/containers/List/ListSeparator.tsx
index 6a78ef65ec..db34b05ba6 100644
--- a/app/containers/List/ListSeparator.tsx
+++ b/app/containers/List/ListSeparator.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import { StyleSheet, View } from 'react-native';
+import { StyleSheet, View, ViewStyle } from 'react-native';
 
 import { themes } from '../../constants/colors';
 import { withTheme } from '../../theme';
@@ -11,12 +11,12 @@ const styles = StyleSheet.create({
 });
 
 interface IListSeparator {
-	style: object;
-	theme: string;
+	style?: ViewStyle;
+	theme?: string;
 }
 
 const ListSeparator = React.memo(({ style, theme }: IListSeparator) => (
-	<View style={[styles.separator, style, { backgroundColor: themes[theme].separatorColor }]} />
+	<View style={[styles.separator, style, { backgroundColor: themes[theme!].separatorColor }]} />
 ));
 
 ListSeparator.displayName = 'List.Separator';
diff --git a/app/containers/Loading.tsx b/app/containers/Loading.tsx
index 6bcc3baa0d..cd4ed285d3 100644
--- a/app/containers/Loading.tsx
+++ b/app/containers/Loading.tsx
@@ -19,7 +19,7 @@ const styles = StyleSheet.create({
 
 interface ILoadingProps {
 	visible: boolean;
-	theme: string;
+	theme?: string;
 }
 
 class Loading extends React.PureComponent<ILoadingProps, any> {
@@ -97,7 +97,7 @@ class Loading extends React.PureComponent<ILoadingProps, any> {
 
 		const opacityAnimation = opacity.interpolate({
 			inputRange: [0, 1],
-			outputRange: [0, themes[theme].backdropOpacity],
+			outputRange: [0, themes[theme!].backdropOpacity],
 			extrapolate: 'clamp'
 		});
 
@@ -109,7 +109,7 @@ class Loading extends React.PureComponent<ILoadingProps, any> {
 							{
 								// @ts-ignore
 								...StyleSheet.absoluteFill,
-								backgroundColor: themes[theme].backdropColor,
+								backgroundColor: themes[theme!].backdropColor,
 								opacity: opacityAnimation
 							}
 						]}
diff --git a/app/containers/MessageActions/Header.tsx b/app/containers/MessageActions/Header.tsx
index d3556ccb6b..ace8d56b7b 100644
--- a/app/containers/MessageActions/Header.tsx
+++ b/app/containers/MessageActions/Header.tsx
@@ -17,7 +17,7 @@ interface IHeader {
 	server: string;
 	message: object;
 	isMasterDetail: boolean;
-	theme: string;
+	theme?: string;
 }
 
 interface THeaderItem {
@@ -117,19 +117,19 @@ const Header = React.memo(({ handleReaction, server, message, isMasterDetail, th
 	const onReaction = ({ emoji }: { emoji: IEmoji }) => handleReaction(emoji, message);
 
 	const renderItem = useCallback(
-		({ item }) => <HeaderItem item={item} onReaction={onReaction} server={server} theme={theme} />,
+		({ item }) => <HeaderItem item={item} onReaction={onReaction} server={server} theme={theme!} />,
 		[]
 	);
 
-	const renderFooter = useCallback(() => <HeaderFooter onReaction={onReaction} theme={theme} />, []);
+	const renderFooter = useCallback(() => <HeaderFooter onReaction={onReaction} theme={theme!} />, []);
 
 	return (
-		<View style={[styles.container, { backgroundColor: themes[theme].focusedBackground }]}>
+		<View style={[styles.container, { backgroundColor: themes[theme!].focusedBackground }]}>
 			<FlatList
 				data={items}
 				renderItem={renderItem}
 				ListFooterComponent={renderFooter}
-				style={{ backgroundColor: themes[theme].focusedBackground }}
+				style={{ backgroundColor: themes[theme!].focusedBackground }}
 				keyExtractor={keyExtractor}
 				showsHorizontalScrollIndicator={false}
 				scrollEnabled={false}
diff --git a/app/containers/MessageActions/index.tsx b/app/containers/MessageActions/index.tsx
index 4d32abf3b4..4237e2c1ee 100644
--- a/app/containers/MessageActions/index.tsx
+++ b/app/containers/MessageActions/index.tsx
@@ -18,7 +18,7 @@ import events from '../../utils/log/events';
 
 interface IMessageActions {
 	room: {
-		rid: string | number;
+		rid: string;
 		autoTranslateLanguage: any;
 		autoTranslate: any;
 		reactWhenReadOnly: any;
diff --git a/app/containers/MessageBox/CommandsPreview/Item.tsx b/app/containers/MessageBox/CommandsPreview/Item.tsx
index 6f89d254ef..33e3c4ff32 100644
--- a/app/containers/MessageBox/CommandsPreview/Item.tsx
+++ b/app/containers/MessageBox/CommandsPreview/Item.tsx
@@ -14,7 +14,7 @@ interface IMessageBoxCommandsPreviewItem {
 		id: string;
 		value: string;
 	};
-	theme: string;
+	theme?: string;
 }
 
 const Item = ({ item, theme }: IMessageBoxCommandsPreviewItem) => {
@@ -37,7 +37,7 @@ const Item = ({ item, theme }: IMessageBoxCommandsPreviewItem) => {
 					{loading ? <ActivityIndicator theme={theme} /> : null}
 				</FastImage>
 			) : (
-				<CustomIcon name='attach' size={36} color={themes[theme].actionTintColor} />
+				<CustomIcon name='attach' size={36} color={themes[theme!].actionTintColor} />
 			)}
 		</TouchableOpacity>
 	);
diff --git a/app/containers/MessageBox/CommandsPreview/index.tsx b/app/containers/MessageBox/CommandsPreview/index.tsx
index 3820f6fa61..c5434f6692 100644
--- a/app/containers/MessageBox/CommandsPreview/index.tsx
+++ b/app/containers/MessageBox/CommandsPreview/index.tsx
@@ -10,7 +10,7 @@ import { withTheme } from '../../../theme';
 interface IMessageBoxCommandsPreview {
 	commandPreview: [];
 	showCommandPreview: boolean;
-	theme: string;
+	theme?: string;
 }
 
 const CommandsPreview = React.memo(
@@ -21,7 +21,7 @@ const CommandsPreview = React.memo(
 		return (
 			<FlatList
 				testID='commandbox-container'
-				style={[styles.mentionList, { backgroundColor: themes[theme].messageboxBackground }]}
+				style={[styles.mentionList, { backgroundColor: themes[theme!].messageboxBackground }]}
 				data={commandPreview}
 				renderItem={({ item }) => <Item item={item} theme={theme} />}
 				keyExtractor={(item: any) => item.id}
diff --git a/app/containers/RoomHeader/RoomHeader.tsx b/app/containers/RoomHeader/RoomHeader.tsx
index 0ca3bbf5a7..719725fec8 100644
--- a/app/containers/RoomHeader/RoomHeader.tsx
+++ b/app/containers/RoomHeader/RoomHeader.tsx
@@ -68,11 +68,11 @@ interface IRoomHeader {
 	tmid: string;
 	teamMain: boolean;
 	status: string;
-	theme: string;
+	theme?: string;
 	usersTyping: [];
 	isGroupChat: boolean;
 	parentTitle: string;
-	onPress: Function;
+	onPress: () => void;
 	testID: string;
 }
 
@@ -164,7 +164,7 @@ const Header = React.memo(
 			renderFunc = () => (
 				<View style={styles.titleContainer}>
 					<RoomTypeIcon type={prid ? 'discussion' : type} isGroupChat={isGroupChat} status={status} teamMain={teamMain} />
-					<Text style={[styles.subtitle, { color: themes[theme].auxiliaryText }]} numberOfLines={1}>
+					<Text style={[styles.subtitle, { color: themes[theme!].auxiliaryText }]} numberOfLines={1}>
 						{parentTitle}
 					</Text>
 				</View>
@@ -186,9 +186,15 @@ const Header = React.memo(
 					{tmid ? null : (
 						<RoomTypeIcon type={prid ? 'discussion' : type} isGroupChat={isGroupChat} status={status} teamMain={teamMain} />
 					)}
-					<HeaderTitle title={title} tmid={tmid} prid={prid} scale={scale} theme={theme} testID={testID} />
+					<HeaderTitle title={title} tmid={tmid} prid={prid} scale={scale} theme={theme!} testID={testID} />
 				</View>
-				<SubTitle usersTyping={tmid ? [] : usersTyping} subtitle={subtitle} theme={theme} renderFunc={renderFunc} scale={scale} />
+				<SubTitle
+					usersTyping={tmid ? [] : usersTyping}
+					subtitle={subtitle}
+					theme={theme!}
+					renderFunc={renderFunc}
+					scale={scale}
+				/>
 			</TouchableOpacity>
 		);
 	}
diff --git a/app/containers/RoomHeader/index.tsx b/app/containers/RoomHeader/index.tsx
index 5b06fb898f..fb00bc10c9 100644
--- a/app/containers/RoomHeader/index.tsx
+++ b/app/containers/RoomHeader/index.tsx
@@ -13,7 +13,7 @@ interface IRoomHeaderContainerProps {
 	prid: string;
 	tmid: string;
 	teamMain: boolean;
-	usersTyping: string;
+	usersTyping: [];
 	status: string;
 	statusText: string;
 	connecting: boolean;
@@ -79,14 +79,12 @@ class RoomHeaderContainer extends Component<IRoomHeaderContainerProps, any> {
 			teamMain,
 			prid,
 			tmid,
-			widthOffset,
 			status = 'offline',
 			statusText,
 			connecting,
 			connected,
 			usersTyping,
 			onPress,
-			roomUserId,
 			width,
 			height,
 			parentTitle,
@@ -115,9 +113,6 @@ class RoomHeaderContainer extends Component<IRoomHeaderContainerProps, any> {
 				width={width}
 				height={height}
 				usersTyping={usersTyping}
-				widthOffset={widthOffset}
-				roomUserId={roomUserId}
-				connecting={connecting}
 				parentTitle={parentTitle}
 				isGroupChat={isGroupChat}
 				testID={testID}
diff --git a/app/containers/RoomTypeIcon.tsx b/app/containers/RoomTypeIcon.tsx
index b4ac871e67..a157f53b44 100644
--- a/app/containers/RoomTypeIcon.tsx
+++ b/app/containers/RoomTypeIcon.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import { StyleSheet } from 'react-native';
+import { StyleSheet, ViewStyle } from 'react-native';
 
 import { CustomIcon } from '../lib/Icons';
 import { STATUS_COLORS, themes } from '../constants/colors';
@@ -13,13 +13,13 @@ const styles = StyleSheet.create({
 });
 
 interface IRoomTypeIcon {
-	theme: string;
+	theme?: string;
 	type: string;
-	isGroupChat: boolean;
-	teamMain: boolean;
-	status: string;
-	size: number;
-	style: any;
+	isGroupChat?: boolean;
+	teamMain?: boolean;
+	status?: string;
+	size?: number;
+	style?: ViewStyle;
 }
 
 const RoomTypeIcon = React.memo(({ type, isGroupChat, status, style, theme, teamMain, size = 16 }: IRoomTypeIcon) => {
@@ -27,11 +27,13 @@ const RoomTypeIcon = React.memo(({ type, isGroupChat, status, style, theme, team
 		return null;
 	}
 
-	const color = themes[theme].titleText;
+	const color = themes[theme!].titleText;
 	const iconStyle = [styles.icon, { color }, style];
 
 	if (type === 'd' && !isGroupChat) {
-		return <Status style={[iconStyle, { color: STATUS_COLORS[status] ?? STATUS_COLORS.offline }]} size={size} status={status} />;
+		return (
+			<Status style={[iconStyle, { color: STATUS_COLORS[status!] ?? STATUS_COLORS.offline }]} size={size} status={status!} />
+		);
 	}
 
 	// TODO: move this to a separate function
diff --git a/app/containers/SafeAreaView.tsx b/app/containers/SafeAreaView.tsx
index 7daa3347ef..3794fdb911 100644
--- a/app/containers/SafeAreaView.tsx
+++ b/app/containers/SafeAreaView.tsx
@@ -12,16 +12,16 @@ const styles = StyleSheet.create({
 });
 
 interface ISafeAreaView {
-	testID: string;
-	theme: string;
-	vertical: boolean;
-	style: object;
-	children: JSX.Element;
+	testID?: string;
+	theme?: string;
+	vertical?: boolean;
+	style?: object;
+	children: React.ReactNode;
 }
 
 const SafeAreaView = React.memo(({ style, children, testID, theme, vertical = true, ...props }: ISafeAreaView) => (
 	<SafeAreaContext
-		style={[styles.view, { backgroundColor: themes[theme].auxiliaryBackground }, style]}
+		style={[styles.view, { backgroundColor: themes[theme!].auxiliaryBackground }, style]}
 		edges={vertical ? ['right', 'left'] : undefined}
 		testID={testID}
 		{...props}>
diff --git a/app/containers/SearchBox.tsx b/app/containers/SearchBox.tsx
index 6668e0f76a..9ab236eb09 100644
--- a/app/containers/SearchBox.tsx
+++ b/app/containers/SearchBox.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import { StyleSheet, Text, TextInputProps, View } from 'react-native';
+import { NativeSyntheticEvent, StyleSheet, Text, TextInputFocusEventData, TextInputProps, View } from 'react-native';
 import Touchable from 'react-native-platform-touchable';
 
 import TextInput from '../presentation/TextInput';
@@ -45,13 +45,15 @@ const styles = StyleSheet.create({
 });
 
 interface ISearchBox {
+	value?: string;
 	onChangeText: TextInputProps['onChangeText'];
-	onSubmitEditing: () => void;
-	hasCancel: boolean;
-	onCancelPress: Function;
-	theme: string;
-	inputRef: any;
+	onSubmitEditing?: () => void;
+	hasCancel?: boolean;
+	onCancelPress?: Function;
+	theme?: string;
+	inputRef?: React.Ref<unknown>;
 	testID?: string;
+	onFocus?: (e: NativeSyntheticEvent<TextInputFocusEventData>) => void;
 }
 
 const CancelButton = (onCancelPress: Function, theme: string) => (
@@ -73,10 +75,10 @@ const SearchBox = ({
 	<View
 		style={[
 			styles.container,
-			{ backgroundColor: isIOS ? themes[theme].headerBackground : themes[theme].headerSecondaryBackground }
+			{ backgroundColor: isIOS ? themes[theme!].headerBackground : themes[theme!].headerSecondaryBackground }
 		]}>
-		<View style={[styles.searchBox, { backgroundColor: themes[theme].searchboxBackground }]}>
-			<CustomIcon name='search' size={14} color={themes[theme].auxiliaryText} />
+		<View style={[styles.searchBox, { backgroundColor: themes[theme!].searchboxBackground }]}>
+			<CustomIcon name='search' size={14} color={themes[theme!].auxiliaryText} />
 			<TextInput
 				ref={inputRef}
 				autoCapitalize='none'
@@ -90,11 +92,11 @@ const SearchBox = ({
 				underlineColorAndroid='transparent'
 				onChangeText={onChangeText}
 				onSubmitEditing={onSubmitEditing}
-				theme={theme}
+				theme={theme!}
 				{...props}
 			/>
 		</View>
-		{hasCancel ? CancelButton(onCancelPress, theme) : null}
+		{hasCancel ? CancelButton(onCancelPress!, theme!) : null}
 	</View>
 );
 
diff --git a/app/containers/SearchHeader.js b/app/containers/SearchHeader.tsx
similarity index 80%
rename from app/containers/SearchHeader.js
rename to app/containers/SearchHeader.tsx
index e231d07485..4b0a491761 100644
--- a/app/containers/SearchHeader.js
+++ b/app/containers/SearchHeader.tsx
@@ -1,6 +1,5 @@
 import React from 'react';
 import { StyleSheet, View } from 'react-native';
-import PropTypes from 'prop-types';
 
 import { withTheme } from '../theme';
 import sharedStyles from '../views/Styles';
@@ -20,9 +19,14 @@ const styles = StyleSheet.create({
 	}
 });
 
+interface ISearchHeader {
+	theme?: string;
+	onSearchChangeText?: (text: string) => void;
+}
+
 // TODO: it might be useful to refactor this component for reusage
-const SearchHeader = ({ theme, onSearchChangeText }) => {
-	const titleColorStyle = { color: themes[theme].headerTitleColor };
+const SearchHeader = ({ theme, onSearchChangeText }: ISearchHeader) => {
+	const titleColorStyle = { color: themes[theme!].headerTitleColor };
 	const isLight = theme === 'light';
 	const { isLandscape } = useOrientation();
 	const scale = isIOS && isLandscape && !isTablet ? 0.8 : 1;
@@ -35,15 +39,11 @@ const SearchHeader = ({ theme, onSearchChangeText }) => {
 				style={[styles.title, isLight && titleColorStyle, { fontSize: titleFontSize }]}
 				placeholder='Search'
 				onChangeText={onSearchChangeText}
-				theme={theme}
+				theme={theme!}
 				testID='thread-messages-view-search-header'
 			/>
 		</View>
 	);
 };
 
-SearchHeader.propTypes = {
-	theme: PropTypes.string,
-	onSearchChangeText: PropTypes.func
-};
 export default withTheme(SearchHeader);
diff --git a/app/containers/StatusBar.tsx b/app/containers/StatusBar.tsx
index da115f4edf..5ebaf23076 100644
--- a/app/containers/StatusBar.tsx
+++ b/app/containers/StatusBar.tsx
@@ -5,9 +5,9 @@ import { themes } from '../constants/colors';
 import { withTheme } from '../theme';
 
 interface IStatusBar {
-	theme: string;
-	barStyle: any;
-	backgroundColor: string;
+	theme?: string;
+	barStyle?: any;
+	backgroundColor?: string;
 }
 
 const StatusBar = React.memo(({ theme, barStyle, backgroundColor }: IStatusBar) => {
@@ -17,7 +17,7 @@ const StatusBar = React.memo(({ theme, barStyle, backgroundColor }: IStatusBar)
 			barStyle = 'dark-content';
 		}
 	}
-	return <StatusBarRN backgroundColor={backgroundColor ?? themes[theme].headerBackground} barStyle={barStyle} animated />;
+	return <StatusBarRN backgroundColor={backgroundColor ?? themes[theme!].headerBackground} barStyle={barStyle} animated />;
 });
 
 export default withTheme(StatusBar);
diff --git a/app/containers/TextInput.tsx b/app/containers/TextInput.tsx
index 28ae1c2f15..76cb1765cb 100644
--- a/app/containers/TextInput.tsx
+++ b/app/containers/TextInput.tsx
@@ -50,7 +50,7 @@ const styles = StyleSheet.create({
 	}
 });
 
-interface IRCTextInputProps extends TextInputProps {
+export interface IRCTextInputProps extends TextInputProps {
 	label?: string;
 	error?: {
 		error: any;
diff --git a/app/containers/ThreadDetails.tsx b/app/containers/ThreadDetails.tsx
index 86f670f008..90f3faa4b8 100644
--- a/app/containers/ThreadDetails.tsx
+++ b/app/containers/ThreadDetails.tsx
@@ -1,11 +1,12 @@
 import React from 'react';
-import { StyleSheet, Text, View } from 'react-native';
+import { StyleSheet, Text, View, ViewStyle } from 'react-native';
 import Touchable from 'react-native-platform-touchable';
 
 import { CustomIcon } from '../lib/Icons';
 import { themes } from '../constants/colors';
 import sharedStyles from '../views/Styles';
 import { withTheme } from '../theme';
+import { TThreadModel } from '../definitions/IThread';
 
 const styles = StyleSheet.create({
 	container: {
@@ -40,33 +41,25 @@ const styles = StyleSheet.create({
 });
 
 interface IThreadDetails {
-	item: {
-		tcount: number | string;
-		replies: any;
-		id: string;
-	};
+	item: Partial<TThreadModel>;
 	user: {
 		id: string;
 	};
-	badgeColor: string;
+	badgeColor?: string;
 	toggleFollowThread: Function;
-	style: object;
-	theme: string;
+	style: ViewStyle;
+	theme?: string;
 }
 
 const ThreadDetails = ({ item, user, badgeColor, toggleFollowThread, style, theme }: IThreadDetails) => {
 	let { tcount } = item;
-	if (tcount >= 1000) {
+	if (tcount! >= 1000) {
 		tcount = '+999';
-	} else if (tcount >= 100) {
-		tcount = '+99';
 	}
 
-	let replies = item?.replies?.length ?? 0;
+	let replies: number | string = item?.replies?.length ?? 0;
 	if (replies >= 1000) {
 		replies = '+999';
-	} else if (replies >= 100) {
-		replies = '+99';
 	}
 
 	const isFollowing = item.replies?.find((u: any) => u === user?.id);
@@ -75,15 +68,15 @@ const ThreadDetails = ({ item, user, badgeColor, toggleFollowThread, style, them
 		<View style={[styles.container, style]}>
 			<View style={styles.detailsContainer}>
 				<View style={styles.detailContainer}>
-					<CustomIcon name='threads' size={24} color={themes[theme].auxiliaryText} />
-					<Text style={[styles.detailText, { color: themes[theme].auxiliaryText }]} numberOfLines={1}>
+					<CustomIcon name='threads' size={24} color={themes[theme!].auxiliaryText} />
+					<Text style={[styles.detailText, { color: themes[theme!].auxiliaryText }]} numberOfLines={1}>
 						{tcount}
 					</Text>
 				</View>
 
 				<View style={styles.detailContainer}>
-					<CustomIcon name='user' size={24} color={themes[theme].auxiliaryText} />
-					<Text style={[styles.detailText, { color: themes[theme].auxiliaryText }]} numberOfLines={1}>
+					<CustomIcon name='user' size={24} color={themes[theme!].auxiliaryText} />
+					<Text style={[styles.detailText, { color: themes[theme!].auxiliaryText }]} numberOfLines={1}>
 						{replies}
 					</Text>
 				</View>
@@ -95,7 +88,7 @@ const ThreadDetails = ({ item, user, badgeColor, toggleFollowThread, style, them
 					<CustomIcon
 						size={24}
 						name={isFollowing ? 'notification' : 'notification-disabled'}
-						color={themes[theme].auxiliaryTintColor}
+						color={themes[theme!].auxiliaryTintColor}
 					/>
 				</Touchable>
 			</View>
diff --git a/app/containers/Toast.tsx b/app/containers/Toast.tsx
index 79fcc82721..7dca3e1470 100644
--- a/app/containers/Toast.tsx
+++ b/app/containers/Toast.tsx
@@ -22,7 +22,7 @@ const styles = StyleSheet.create({
 export const LISTENER = 'Toast';
 
 interface IToastProps {
-	theme: string;
+	theme?: string;
 }
 
 class Toast extends React.Component<IToastProps, any> {
@@ -61,8 +61,8 @@ class Toast extends React.Component<IToastProps, any> {
 				ref={this.getToastRef}
 				// @ts-ignore
 				position='center'
-				style={[styles.toast, { backgroundColor: themes[theme].toastBackground }]}
-				textStyle={[styles.text, { color: themes[theme].buttonText }]}
+				style={[styles.toast, { backgroundColor: themes[theme!].toastBackground }]}
+				textStyle={[styles.text, { color: themes[theme!].buttonText }]}
 				opacity={0.9}
 			/>
 		);
diff --git a/app/containers/TwoFactor/index.tsx b/app/containers/TwoFactor/index.tsx
index dd2686ddcc..5bb27774c0 100644
--- a/app/containers/TwoFactor/index.tsx
+++ b/app/containers/TwoFactor/index.tsx
@@ -19,7 +19,7 @@ import styles from './styles';
 export const TWO_FACTOR = 'TWO_FACTOR';
 
 interface ITwoFactor {
-	theme: string;
+	theme?: string;
 	isMasterDetail: boolean;
 }
 
@@ -87,7 +87,7 @@ const TwoFactor = React.memo(({ theme, isMasterDetail }: ITwoFactor) => {
 		setData({});
 	};
 
-	const color = themes[theme].titleText;
+	const color = themes[theme!].titleText;
 	return (
 		<Modal
 			// @ts-ignore
@@ -101,7 +101,7 @@ const TwoFactor = React.memo(({ theme, isMasterDetail }: ITwoFactor) => {
 					style={[
 						styles.content,
 						isMasterDetail && [sharedStyles.modalFormSheet, styles.tablet],
-						{ backgroundColor: themes[theme].backgroundColor }
+						{ backgroundColor: themes[theme!].backgroundColor }
 					]}>
 					<Text style={[styles.title, { color }]}>{I18n.t(method?.title || 'Two_Factor_Authentication')}</Text>
 					{method?.text ? <Text style={[styles.subtitle, { color }]}>{I18n.t(method.text)}</Text> : null}
@@ -128,7 +128,7 @@ const TwoFactor = React.memo(({ theme, isMasterDetail }: ITwoFactor) => {
 						<Button
 							title={I18n.t('Cancel')}
 							type='secondary'
-							backgroundColor={themes[theme].chatComponentBackground}
+							backgroundColor={themes[theme!].chatComponentBackground}
 							style={styles.button}
 							onPress={onCancel}
 							theme={theme}
diff --git a/app/containers/markdown/index.tsx b/app/containers/markdown/index.tsx
index f4800579b3..e8e2ea06ba 100644
--- a/app/containers/markdown/index.tsx
+++ b/app/containers/markdown/index.tsx
@@ -5,6 +5,7 @@ import Renderer from 'commonmark-react-renderer';
 import removeMarkdown from 'remove-markdown';
 import { MarkdownAST } from '@rocket.chat/message-parser';
 
+import { UserMention } from '../message/interfaces';
 import shortnameToUnicode from '../../utils/shortnameToUnicode';
 import I18n from '../../i18n';
 import { themes } from '../../constants/colors';
@@ -23,14 +24,6 @@ import styles from './styles';
 import { isValidURL } from '../../utils/url';
 import NewMarkdown from './new';
 
-interface IUser {
-	_id: string;
-	username: string;
-	name: string;
-}
-
-type UserMention = Pick<IUser, '_id' | 'username' | 'name'>;
-
 interface IMarkdownProps {
 	msg: string;
 	md: MarkdownAST;
diff --git a/app/containers/message/Audio.tsx b/app/containers/message/Audio.tsx
index 958ae8ee8e..8a93cab149 100644
--- a/app/containers/message/Audio.tsx
+++ b/app/containers/message/Audio.tsx
@@ -30,7 +30,7 @@ interface IMessageAudioProps {
 	};
 	theme: string;
 	getCustomEmoji: Function;
-	scale: number;
+	scale?: number;
 }
 
 interface IMessageAudioState {
diff --git a/app/containers/message/Reactions.tsx b/app/containers/message/Reactions.tsx
index 823c4637d8..58c82486ed 100644
--- a/app/containers/message/Reactions.tsx
+++ b/app/containers/message/Reactions.tsx
@@ -24,7 +24,7 @@ interface IMessageReaction {
 }
 
 interface IMessageReactions {
-	reactions: object[];
+	reactions?: object[];
 	getCustomEmoji: Function;
 	theme: string;
 }
diff --git a/app/containers/message/Urls.tsx b/app/containers/message/Urls.tsx
index f847fa1465..f3b86dd1c1 100644
--- a/app/containers/message/Urls.tsx
+++ b/app/containers/message/Urls.tsx
@@ -68,8 +68,8 @@ interface IMessageUrl {
 }
 
 interface IMessageUrls {
-	urls: any;
-	theme: string;
+	urls?: any;
+	theme?: string;
 }
 
 const UrlImage = React.memo(
@@ -156,7 +156,7 @@ const Urls = React.memo(
 			return null;
 		}
 
-		return urls.map((url: any, index: number) => <Url url={url} key={url.url} index={index} theme={theme} />);
+		return urls.map((url: any, index: number) => <Url url={url} key={url.url} index={index} theme={theme!} />);
 	},
 	(oldProps, newProps) => dequal(oldProps.urls, newProps.urls) && oldProps.theme === newProps.theme
 );
diff --git a/app/containers/message/User.tsx b/app/containers/message/User.tsx
index 73adf316ea..b03620d9a6 100644
--- a/app/containers/message/User.tsx
+++ b/app/containers/message/User.tsx
@@ -38,17 +38,17 @@ const styles = StyleSheet.create({
 });
 
 interface IMessageUser {
-	isHeader: boolean;
-	hasError: boolean;
+	isHeader?: boolean;
+	hasError?: boolean;
 	useRealName: boolean;
-	author: {
+	author?: {
 		_id: string;
-		name: string;
-		username: string;
+		name?: string;
+		username?: string;
 	};
-	alias: string;
-	ts: Date;
-	timeFormat: string;
+	alias?: string;
+	ts?: Date;
+	timeFormat?: string;
 	theme: string;
 	navToRoomInfo: Function;
 	type: string;
@@ -59,16 +59,16 @@ const User = React.memo(
 		if (isHeader || hasError) {
 			const navParam = {
 				t: 'd',
-				rid: author._id
+				rid: author!._id
 			};
 			const { user } = useContext(MessageContext);
-			const username = (useRealName && author.name) || author.username;
+			const username = (useRealName && author!.name) || author!.username;
 			const aliasUsername = alias ? (
 				<Text style={[styles.alias, { color: themes[theme].auxiliaryText }]}> @{username}</Text>
 			) : null;
 			const time = moment(ts).format(timeFormat);
 			const onUserPress = () => navToRoomInfo(navParam);
-			const isDisabled = author._id === user.id;
+			const isDisabled = author!._id === user.id;
 
 			const textContent = (
 				<>
diff --git a/app/containers/message/index.tsx b/app/containers/message/index.tsx
index 80f5db31cc..ad86975e7f 100644
--- a/app/containers/message/index.tsx
+++ b/app/containers/message/index.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import { Keyboard } from 'react-native';
+import { Keyboard, ViewStyle } from 'react-native';
 
 import Message from './Message';
 import MessageContext from './Context';
@@ -17,53 +17,55 @@ interface IMessageContainerProps {
 		username: string;
 		token: string;
 	};
-	rid: string;
+	msg?: string;
+	rid?: string;
 	timeFormat: string;
-	style: any;
-	archived: boolean;
-	broadcast: boolean;
-	previousItem: {
+	style?: ViewStyle;
+	archived?: boolean;
+	broadcast?: boolean;
+	previousItem?: {
 		ts: any;
 		u: any;
 		groupable: any;
-		id: any;
-		tmid: any;
+		id: string;
+		tmid: string;
 		status: any;
 	};
+	isHeader: boolean;
 	baseUrl: string;
-	Message_GroupingPeriod: number;
-	isReadReceiptEnabled: boolean;
+	Message_GroupingPeriod?: number;
+	isReadReceiptEnabled?: boolean;
 	isThreadRoom: boolean;
 	useRealName: boolean;
-	autoTranslateRoom: boolean;
-	autoTranslateLanguage: string;
-	status: number;
-	isIgnored: boolean;
-	highlighted: boolean;
-	getCustomEmoji(): void;
-	onLongPress: Function;
-	onReactionPress: Function;
-	onEncryptedPress: Function;
-	onDiscussionPress: Function;
-	onThreadPress: Function;
-	errorActionsShow: Function;
-	replyBroadcast: Function;
-	reactionInit: Function;
-	fetchThreadName: Function;
-	showAttachment: Function;
-	onReactionLongPress: Function;
-	navToRoomInfo: Function;
-	callJitsi: Function;
-	blockAction: Function;
-	onAnswerButtonPress: Function;
+	autoTranslateRoom?: boolean;
+	autoTranslateLanguage?: string;
+	status?: number;
+	isIgnored?: boolean;
+	highlighted?: boolean;
+	getCustomEmoji(name: string): void;
+	onLongPress?: Function;
+	onReactionPress?: Function;
+	onEncryptedPress?: Function;
+	onDiscussionPress?: Function;
+	onThreadPress?: Function;
+	errorActionsShow?: Function;
+	replyBroadcast?: Function;
+	reactionInit?: Function;
+	fetchThreadName?: Function;
+	showAttachment?: Function;
+	onReactionLongPress?: Function;
+	navToRoomInfo?: Function;
+	callJitsi?: Function;
+	blockAction?: Function;
+	onAnswerButtonPress?: Function;
 	theme: string;
-	threadBadgeColor: string;
-	toggleFollowThread: Function;
-	jumpToMessage: Function;
+	threadBadgeColor?: string;
+	toggleFollowThread?: Function;
+	jumpToMessage?: Function;
 	onPress: Function;
 }
 
-class MessageContainer extends React.Component<IMessageContainerProps, any> {
+class MessageContainer extends React.Component<IMessageContainerProps> {
 	static defaultProps = {
 		getCustomEmoji: () => {},
 		onLongPress: () => {},
@@ -224,7 +226,7 @@ class MessageContainer extends React.Component<IMessageContainerProps, any> {
 				previousItem.ts.toDateString() === item.ts.toDateString() &&
 				previousItem.u.username === item.u.username &&
 				!(previousItem.groupable === false || item.groupable === false || broadcast === true) &&
-				item.ts - previousItem.ts < Message_GroupingPeriod * 1000 &&
+				item.ts - previousItem.ts < Message_GroupingPeriod! * 1000 &&
 				previousItem.tmid === item.tmid
 			) {
 				return false;
@@ -299,7 +301,7 @@ class MessageContainer extends React.Component<IMessageContainerProps, any> {
 		const { item, theme, jumpToMessage } = this.props;
 		const isMessageLink = item?.attachments?.findIndex((att: any) => att?.message_link === link) !== -1;
 		if (isMessageLink) {
-			return jumpToMessage(link);
+			return jumpToMessage!(link);
 		}
 		openLink(link, theme);
 	};
@@ -365,7 +367,7 @@ class MessageContainer extends React.Component<IMessageContainerProps, any> {
 		// "autoTranslateRoom" and "autoTranslateLanguage" are properties from the subscription
 		// "autoTranslateMessage" is a toggle between "View Original" and "Translate" state
 		if (autoTranslateRoom && autoTranslateMessage) {
-			message = getMessageTranslation(item, autoTranslateLanguage) || message;
+			message = getMessageTranslation(item, autoTranslateLanguage!) || message;
 		}
 
 		return (
@@ -393,7 +395,7 @@ class MessageContainer extends React.Component<IMessageContainerProps, any> {
 					id={id}
 					msg={message}
 					md={md}
-					rid={rid}
+					rid={rid!}
 					author={u}
 					ts={ts}
 					type={t}
@@ -407,10 +409,10 @@ class MessageContainer extends React.Component<IMessageContainerProps, any> {
 					emoji={emoji}
 					timeFormat={timeFormat}
 					style={style}
-					archived={archived}
-					broadcast={broadcast}
+					archived={archived!}
+					broadcast={broadcast!}
 					useRealName={useRealName}
-					isReadReceiptEnabled={isReadReceiptEnabled}
+					isReadReceiptEnabled={isReadReceiptEnabled!}
 					unread={unread}
 					role={role}
 					drid={drid}
@@ -420,10 +422,10 @@ class MessageContainer extends React.Component<IMessageContainerProps, any> {
 					tcount={tcount}
 					tlm={tlm}
 					tmsg={tmsg}
-					fetchThreadName={fetchThreadName}
+					fetchThreadName={fetchThreadName!}
 					mentions={mentions}
 					channels={channels}
-					isIgnored={this.isIgnored}
+					isIgnored={this.isIgnored!}
 					isEdited={editedBy && !!editedBy.username}
 					isHeader={this.isHeader}
 					isThreadReply={this.isThreadReply}
@@ -433,13 +435,13 @@ class MessageContainer extends React.Component<IMessageContainerProps, any> {
 					isTemp={this.isTemp}
 					isEncrypted={this.isEncrypted}
 					hasError={this.hasError}
-					showAttachment={showAttachment}
+					showAttachment={showAttachment!}
 					getCustomEmoji={getCustomEmoji}
-					navToRoomInfo={navToRoomInfo}
-					callJitsi={callJitsi}
-					blockAction={blockAction}
+					navToRoomInfo={navToRoomInfo!}
+					callJitsi={callJitsi!}
+					blockAction={blockAction!}
 					theme={theme}
-					highlighted={highlighted}
+					highlighted={highlighted!}
 				/>
 			</MessageContext.Provider>
 		);
diff --git a/app/containers/message/interfaces.ts b/app/containers/message/interfaces.ts
index 866e7e40ec..7d3e149504 100644
--- a/app/containers/message/interfaces.ts
+++ b/app/containers/message/interfaces.ts
@@ -51,12 +51,13 @@ export interface IMessageCallButton {
 }
 
 export interface IUser {
-	_id: string;
+	id: string;
 	username: string;
+	token: string;
 	name: string;
 }
 
-export type UserMention = Pick<IUser, '_id' | 'username' | 'name'>;
+export type UserMention = Pick<IUser, 'id' | 'username' | 'name'>;
 
 export interface IMessageContent {
 	_id: string;
diff --git a/app/definitions/IRoom.ts b/app/definitions/IRoom.ts
index d55cf34a55..503ea4dd72 100644
--- a/app/definitions/IRoom.ts
+++ b/app/definitions/IRoom.ts
@@ -1,9 +1,16 @@
 import Model from '@nozbe/watermelondb/Model';
 
 import { IServedBy } from './IServedBy';
+import { SubscriptionType } from './ISubscription';
 
 export interface IRoom {
 	id: string;
+	rid: string;
+	prid: string;
+	t: SubscriptionType;
+	name: string;
+	teamMain: boolean;
+	alert?: boolean;
 	customFields: string[];
 	broadcast: boolean;
 	encrypted: boolean;
diff --git a/app/definitions/IThread.ts b/app/definitions/IThread.ts
index ad151283b9..e97b2348c9 100644
--- a/app/definitions/IThread.ts
+++ b/app/definitions/IThread.ts
@@ -43,10 +43,10 @@ export interface IThread {
 	id: string;
 	msg?: string;
 	t?: SubscriptionType;
-	rid: string;
-	_updatedAt: Date;
-	ts: Date;
-	u: IUserMessage;
+	rid?: string;
+	_updatedAt?: Date;
+	ts?: Date;
+	u?: IUserMessage;
 	alias?: string;
 	parseUrls?: boolean;
 	groupable?: boolean;
@@ -64,8 +64,8 @@ export interface IThread {
 	dcount?: number;
 	dlm?: number;
 	tmid?: string;
-	tcount?: number;
-	tlm?: Date;
+	tcount: number | string;
+	tlm?: string;
 	replies?: string[];
 	mentions?: IUserMention[];
 	channels?: IUserChannel[];
diff --git a/app/navigationTypes.ts b/app/definitions/navigationTypes.ts
similarity index 65%
rename from app/navigationTypes.ts
rename to app/definitions/navigationTypes.ts
index cbf17f42e8..6e2020943a 100644
--- a/app/navigationTypes.ts
+++ b/app/definitions/navigationTypes.ts
@@ -1,10 +1,21 @@
 import { NavigatorScreenParams } from '@react-navigation/core';
+import { StackNavigationOptions } from '@react-navigation/stack';
 
-import { ISubscription } from './definitions/ISubscription';
-import { IServer } from './definitions/IServer';
-import { IAttachment } from './definitions/IAttachment';
-import { MasterDetailInsideStackParamList } from './stacks/MasterDetailStack/types';
-import { OutsideParamList, InsideStackParamList } from './stacks/types';
+import { ISubscription } from './ISubscription';
+import { IServer } from './IServer';
+import { IAttachment } from './IAttachment';
+import { MasterDetailInsideStackParamList } from '../stacks/MasterDetailStack/types';
+import { OutsideParamList, InsideStackParamList } from '../stacks/types';
+
+interface INavigationProps {
+	route?: any;
+	navigation?: any;
+	isMasterDetail?: boolean;
+}
+
+export type TNavigationOptions = {
+	navigationOptions?(props: INavigationProps): StackNavigationOptions;
+};
 
 export type SetUsernameStackParamList = {
 	SetUsernameView: {
diff --git a/app/dimensions.tsx b/app/dimensions.tsx
index 6760096830..ddf95d6d37 100644
--- a/app/dimensions.tsx
+++ b/app/dimensions.tsx
@@ -2,6 +2,8 @@ import React from 'react';
 import { Dimensions } from 'react-native';
 import hoistNonReactStatics from 'hoist-non-react-statics';
 
+import { TNavigationOptions } from './definitions/navigationTypes';
+
 export interface IDimensionsContextProps {
 	width: number;
 	height?: number;
@@ -22,10 +24,11 @@ export interface IDimensionsContextProps {
 
 export const DimensionsContext = React.createContext<Partial<IDimensionsContextProps>>(Dimensions.get('window'));
 
-export function withDimensions(Component: any): any {
-	const DimensionsComponent = (props: any) => (
+export function withDimensions<T extends object>(Component: React.ComponentType<T> & TNavigationOptions): typeof Component {
+	const DimensionsComponent = (props: T) => (
 		<DimensionsContext.Consumer>{contexts => <Component {...props} {...contexts} />}</DimensionsContext.Consumer>
 	);
+
 	hoistNonReactStatics(DimensionsComponent, Component);
 	return DimensionsComponent;
 }
diff --git a/app/presentation/ServerItem/index.tsx b/app/presentation/ServerItem/index.tsx
index 772fac212b..a9016753bc 100644
--- a/app/presentation/ServerItem/index.tsx
+++ b/app/presentation/ServerItem/index.tsx
@@ -18,9 +18,9 @@ interface IServerItem {
 		name: string;
 	};
 	onPress(): void;
-	onLongPress(): void;
-	hasCheck: boolean;
-	theme: string;
+	onLongPress?(): void;
+	hasCheck?: boolean;
+	theme?: string;
 }
 
 const defaultLogo = require('../../static/images/logo.png');
@@ -31,10 +31,10 @@ const ServerItem = React.memo(({ item, onPress, onLongPress, hasCheck, theme }:
 		onLongPress={() => onLongPress?.()}
 		testID={`rooms-list-header-server-${item.id}`}
 		android_ripple={{
-			color: themes[theme].bannerBackground
+			color: themes[theme!].bannerBackground
 		}}
 		style={({ pressed }: any) => ({
-			backgroundColor: isIOS && pressed ? themes[theme].bannerBackground : themes[theme].backgroundColor
+			backgroundColor: isIOS && pressed ? themes[theme!].bannerBackground : themes[theme!].backgroundColor
 		})}>
 		<View style={styles.serverItemContainer}>
 			{item.iconURL ? (
@@ -52,14 +52,14 @@ const ServerItem = React.memo(({ item, onPress, onLongPress, hasCheck, theme }:
 				<FastImage source={defaultLogo} style={styles.serverIcon} />
 			)}
 			<View style={styles.serverTextContainer}>
-				<Text numberOfLines={1} style={[styles.serverName, { color: themes[theme].titleText }]}>
+				<Text numberOfLines={1} style={[styles.serverName, { color: themes[theme!].titleText }]}>
 					{item.name || item.id}
 				</Text>
-				<Text numberOfLines={1} style={[styles.serverUrl, { color: themes[theme].auxiliaryText }]}>
+				<Text numberOfLines={1} style={[styles.serverUrl, { color: themes[theme!].auxiliaryText }]}>
 					{item.id}
 				</Text>
 			</View>
-			{hasCheck ? <Check theme={theme} /> : null}
+			{hasCheck ? <Check theme={theme!} /> : null}
 		</View>
 	</Pressable>
 ));
diff --git a/app/presentation/TextInput.tsx b/app/presentation/TextInput.tsx
index 028b811b53..4d575fa8f9 100644
--- a/app/presentation/TextInput.tsx
+++ b/app/presentation/TextInput.tsx
@@ -1,6 +1,7 @@
 import React from 'react';
-import { I18nManager, StyleProp, StyleSheet, TextInput, TextInputProps, TextStyle } from 'react-native';
+import { I18nManager, StyleProp, StyleSheet, TextInput, TextStyle } from 'react-native';
 
+import { IRCTextInputProps } from '../containers/TextInput';
 import { themes } from '../constants/colors';
 
 const styles = StyleSheet.create({
@@ -9,7 +10,7 @@ const styles = StyleSheet.create({
 	}
 });
 
-interface IThemedTextInput extends TextInputProps {
+interface IThemedTextInput extends IRCTextInputProps {
 	style: StyleProp<TextStyle>;
 	theme: string;
 }
diff --git a/app/presentation/UnreadBadge/index.tsx b/app/presentation/UnreadBadge/index.tsx
index 609278b92f..96cff5cab9 100644
--- a/app/presentation/UnreadBadge/index.tsx
+++ b/app/presentation/UnreadBadge/index.tsx
@@ -1,5 +1,5 @@
 import React from 'react';
-import { StyleSheet, Text, View } from 'react-native';
+import { StyleSheet, Text, View, ViewStyle } from 'react-native';
 
 import sharedStyles from '../../views/Styles';
 import { getUnreadStyle } from './getUnreadStyle';
@@ -30,15 +30,15 @@ const styles = StyleSheet.create({
 });
 
 interface IUnreadBadge {
-	theme: string;
-	unread: number;
-	userMentions: number;
-	groupMentions: number;
-	style: object;
-	tunread: [];
-	tunreadUser: [];
-	tunreadGroup: [];
-	small: boolean;
+	theme?: string;
+	unread?: number;
+	userMentions?: number;
+	groupMentions?: number;
+	style?: ViewStyle;
+	tunread?: [];
+	tunreadUser?: [];
+	tunreadGroup?: [];
+	small?: boolean;
 }
 
 const UnreadBadge = React.memo(
diff --git a/app/share.tsx b/app/share.tsx
index fbfcd0b52b..4af2d60260 100644
--- a/app/share.tsx
+++ b/app/share.tsx
@@ -26,7 +26,7 @@ import { setCurrentScreen } from './utils/log';
 import AuthLoadingView from './views/AuthLoadingView';
 import { DimensionsContext } from './dimensions';
 import debounce from './utils/debounce';
-import { ShareInsideStackParamList, ShareOutsideStackParamList, ShareAppStackParamList } from './navigationTypes';
+import { ShareInsideStackParamList, ShareOutsideStackParamList, ShareAppStackParamList } from './definitions/navigationTypes';
 
 interface IDimensions {
 	width: number;
diff --git a/app/stacks/MasterDetailStack/index.tsx b/app/stacks/MasterDetailStack/index.tsx
index 4a945fc0e5..ad5dc2b995 100644
--- a/app/stacks/MasterDetailStack/index.tsx
+++ b/app/stacks/MasterDetailStack/index.tsx
@@ -116,10 +116,10 @@ const ModalStackNavigator = React.memo(({ navigation }: INavigation) => {
 				<ModalStack.Screen
 					name='RoomActionsView'
 					component={RoomActionsView}
-					options={props => RoomActionsView.navigationOptions({ ...props, isMasterDetail: true })}
+					options={props => RoomActionsView.navigationOptions!({ ...props, isMasterDetail: true })}
 				/>
 				<ModalStack.Screen name='RoomInfoView' component={RoomInfoView} options={RoomInfoView.navigationOptions} />
-				<ModalStack.Screen name='SelectListView' component={SelectListView} options={SelectListView.navigationOptions} />
+				<ModalStack.Screen name='SelectListView' component={SelectListView} />
 				<ModalStack.Screen name='RoomInfoEditView' component={RoomInfoEditView} options={RoomInfoEditView.navigationOptions} />
 				<ModalStack.Screen name='RoomMembersView' component={RoomMembersView} options={RoomMembersView.navigationOptions} />
 				<ModalStack.Screen
@@ -145,12 +145,12 @@ const ModalStackNavigator = React.memo(({ navigation }: INavigation) => {
 				<ModalStack.Screen
 					name='DirectoryView'
 					component={DirectoryView}
-					options={props => DirectoryView.navigationOptions({ ...props, isMasterDetail: true })}
+					options={props => DirectoryView.navigationOptions!({ ...props, isMasterDetail: true })}
 				/>
 				<ModalStack.Screen
 					name='QueueListView'
 					component={QueueListView}
-					options={props => QueueListView.navigationOptions({ ...props, isMasterDetail: true })}
+					options={props => QueueListView.navigationOptions!({ ...props, isMasterDetail: true })}
 				/>
 				<ModalStack.Screen
 					name='NotificationPrefView'
@@ -172,12 +172,12 @@ const ModalStackNavigator = React.memo(({ navigation }: INavigation) => {
 				<ModalStack.Screen
 					name='ReadReceiptsView'
 					component={ReadReceiptsView}
-					options={props => ReadReceiptsView.navigationOptions({ ...props, isMasterDetail: true })}
+					options={props => ReadReceiptsView.navigationOptions!({ ...props, isMasterDetail: true })}
 				/>
 				<ModalStack.Screen
 					name='SettingsView'
 					component={SettingsView}
-					options={props => SettingsView.navigationOptions({ ...props, isMasterDetail: true })}
+					options={props => SettingsView.navigationOptions!({ ...props, isMasterDetail: true })}
 				/>
 				<ModalStack.Screen name='LanguageView' component={LanguageView} options={LanguageView.navigationOptions} />
 				<ModalStack.Screen name='ThemeView' component={ThemeView} options={ThemeView.navigationOptions} />
@@ -195,13 +195,13 @@ const ModalStackNavigator = React.memo(({ navigation }: INavigation) => {
 				<ModalStack.Screen
 					name='ProfileView'
 					component={ProfileView}
-					options={props => ProfileView.navigationOptions({ ...props, isMasterDetail: true })}
+					options={props => ProfileView.navigationOptions!({ ...props, isMasterDetail: true })}
 				/>
 				<ModalStack.Screen name='DisplayPrefsView' component={DisplayPrefsView} />
 				<ModalStack.Screen
 					name='AdminPanelView'
 					component={AdminPanelView}
-					options={props => AdminPanelView.navigationOptions({ ...props, isMasterDetail: true })}
+					options={props => AdminPanelView.navigationOptions!({ ...props, isMasterDetail: true })}
 				/>
 				<ModalStack.Screen name='NewMessageView' component={NewMessageView} options={NewMessageView.navigationOptions} />
 				<ModalStack.Screen name='SelectedUsersViewCreateChannel' component={SelectedUsersView} />
diff --git a/app/stacks/types.ts b/app/stacks/types.ts
index c6016f2e4f..3dbb31882e 100644
--- a/app/stacks/types.ts
+++ b/app/stacks/types.ts
@@ -2,6 +2,7 @@ import { NavigatorScreenParams } from '@react-navigation/core';
 import { TextInputProps } from 'react-native';
 import Model from '@nozbe/watermelondb/Model';
 
+import { IRoom } from '../definitions/IRoom';
 import { IOptionsField } from '../views/NotificationPreferencesView/options';
 import { IServer } from '../definitions/IServer';
 import { IAttachment } from '../definitions/IAttachment';
@@ -31,13 +32,13 @@ export type ChatsStackParamList = {
 		joined: boolean;
 	};
 	SelectListView: {
-		data: any;
+		data: IRoom[];
 		title: string;
 		infoText: string;
-		nextAction: Function;
-		showAlert: boolean;
+		nextAction: (selected: string[]) => void;
+		showAlert: () => void;
 		isSearch: boolean;
-		onSearch: Function;
+		onSearch: (text: string) => Partial<IRoom[]>;
 		isRadio?: boolean;
 	};
 	RoomInfoView: {
@@ -64,7 +65,7 @@ export type ChatsStackParamList = {
 		showButton?: boolean;
 		title?: string;
 		buttonText?: string;
-		nextAction?: Function;
+		nextAction?(): void;
 	};
 	InviteUsersView: {
 		rid: string;
diff --git a/app/theme.tsx b/app/theme.tsx
index 9959cd7681..2615fb577d 100644
--- a/app/theme.tsx
+++ b/app/theme.tsx
@@ -1,6 +1,7 @@
 import React from 'react';
 import hoistNonReactStatics from 'hoist-non-react-statics';
 
+import { TNavigationOptions } from './definitions/navigationTypes';
 import { IThemePreference } from './definitions/ITheme';
 
 interface IThemeContextProps {
@@ -11,12 +12,13 @@ interface IThemeContextProps {
 
 export const ThemeContext = React.createContext<IThemeContextProps>({ theme: 'light' });
 
-export function withTheme(Component: any): any {
-	const ThemedComponent = (props: any) => (
+export function withTheme<T extends object>(Component: React.ComponentType<T> & TNavigationOptions): typeof Component {
+	const ThemedComponent = (props: T) => (
 		<ThemeContext.Consumer>{contexts => <Component {...props} {...contexts} />}</ThemeContext.Consumer>
 	);
+
 	hoistNonReactStatics(ThemedComponent, Component);
 	return ThemedComponent;
 }
 
-export const useTheme = () => React.useContext(ThemeContext);
+export const useTheme = (): IThemeContextProps => React.useContext(ThemeContext);
diff --git a/app/views/AddExistingChannelView.tsx b/app/views/AddExistingChannelView.tsx
index 86ab9b9cf4..98fe4d2bae 100644
--- a/app/views/AddExistingChannelView.tsx
+++ b/app/views/AddExistingChannelView.tsx
@@ -22,11 +22,11 @@ import { goRoom } from '../utils/goRoom';
 import { showErrorAlert } from '../utils/info';
 import debounce from '../utils/debounce';
 import { ChatsStackParamList } from '../stacks/types';
+import { IRoom } from '../definitions/IRoom';
 
 interface IAddExistingChannelViewState {
-	// TODO: refactor with Room Model
-	search: any[];
-	channels: any[];
+	search: Array<IRoom>;
+	channels: Array<IRoom>;
 	selected: string[];
 	loading: boolean;
 }
@@ -43,6 +43,7 @@ const QUERY_SIZE = 50;
 
 class AddExistingChannelView extends React.Component<IAddExistingChannelViewProps, IAddExistingChannelViewState> {
 	private teamId?: string;
+
 	constructor(props: IAddExistingChannelViewProps) {
 		super(props);
 		this.query();
@@ -93,10 +94,9 @@ class AddExistingChannelView extends React.Component<IAddExistingChannelViewProp
 				)
 				.fetch();
 
-			// TODO: Refactor with Room Model
-			const asyncFilter = async (channelsArray: any[]) => {
+			const asyncFilter = async (channelsArray: Array<IRoom>) => {
 				const results = await Promise.all(
-					channelsArray.map(async (channel: any) => {
+					channelsArray.map(async (channel: IRoom) => {
 						if (channel.prid) {
 							return false;
 						}
@@ -197,7 +197,7 @@ class AddExistingChannelView extends React.Component<IAddExistingChannelViewProp
 			<FlatList
 				data={search.length > 0 ? search : channels}
 				extraData={this.state}
-				keyExtractor={item => item._id}
+				keyExtractor={item => item.id}
 				ListHeaderComponent={this.renderHeader}
 				renderItem={this.renderItem}
 				ItemSeparatorComponent={List.Separator}
diff --git a/app/views/AdminPanelView/index.tsx b/app/views/AdminPanelView/index.tsx
index f0af5dfa02..5a3dde90ea 100644
--- a/app/views/AdminPanelView/index.tsx
+++ b/app/views/AdminPanelView/index.tsx
@@ -2,6 +2,7 @@ import React from 'react';
 import { WebView } from 'react-native-webview';
 import { connect } from 'react-redux';
 import { DrawerScreenProps } from '@react-navigation/drawer';
+import { StackNavigationOptions } from '@react-navigation/stack';
 
 import I18n from '../../i18n';
 import StatusBar from '../../containers/StatusBar';
@@ -22,7 +23,7 @@ interface INavigationOptions {
 }
 
 class AdminPanelView extends React.Component<IAdminPanelViewProps, any> {
-	static navigationOptions = ({ navigation, isMasterDetail }: INavigationOptions) => ({
+	static navigationOptions = ({ navigation, isMasterDetail }: INavigationOptions): StackNavigationOptions => ({
 		headerLeft: isMasterDetail ? undefined : () => <HeaderButton.Drawer navigation={navigation} />,
 		title: I18n.t('Admin_Panel')
 	});
diff --git a/app/views/AutoTranslateView/index.tsx b/app/views/AutoTranslateView/index.tsx
index 954426891d..23f0e206ca 100644
--- a/app/views/AutoTranslateView/index.tsx
+++ b/app/views/AutoTranslateView/index.tsx
@@ -113,7 +113,7 @@ class AutoTranslateView extends React.Component<IAutoTranslateViewProps, any> {
 
 	renderIcon = () => {
 		const { theme } = this.props;
-		return <List.Icon name='check' style={{ color: themes[theme].tintColor }} />;
+		return <List.Icon name='check' color={themes[theme!].tintColor} />;
 	};
 
 	renderSwitch = () => {
@@ -131,7 +131,7 @@ class AutoTranslateView extends React.Component<IAutoTranslateViewProps, any> {
 				title={name || language}
 				onPress={() => this.saveAutoTranslateLanguage(language)}
 				testID={`auto-translate-view-${language}`}
-				right={isSelected ? this.renderIcon : null}
+				right={() => (isSelected ? this.renderIcon() : null)}
 				translateTitle={false}
 			/>
 		);
diff --git a/app/views/DefaultBrowserView.tsx b/app/views/DefaultBrowserView.tsx
index cfe977d2cd..895f70860f 100644
--- a/app/views/DefaultBrowserView.tsx
+++ b/app/views/DefaultBrowserView.tsx
@@ -127,7 +127,7 @@ class DefaultBrowserView extends React.Component<IDefaultBrowserViewProps, IDefa
 				title={I18n.t(title, { defaultValue: title })}
 				onPress={() => this.changeDefaultBrowser(value)}
 				testID={`default-browser-view-${title}`}
-				right={this.isSelected(value) ? this.renderIcon : null}
+				right={() => (this.isSelected(value) ? this.renderIcon() : null)}
 				translateTitle={false}
 			/>
 		);
diff --git a/app/views/DirectoryView/index.tsx b/app/views/DirectoryView/index.tsx
index 9197815bd5..2213497bee 100644
--- a/app/views/DirectoryView/index.tsx
+++ b/app/views/DirectoryView/index.tsx
@@ -1,7 +1,7 @@
 import React from 'react';
 import { FlatList, Text, View } from 'react-native';
 import { connect } from 'react-redux';
-import { StackNavigationProp } from '@react-navigation/stack';
+import { StackNavigationOptions, StackNavigationProp } from '@react-navigation/stack';
 
 import { ChatsStackParamList } from '../../stacks/types';
 import * as List from '../../containers/List';
@@ -39,8 +39,8 @@ interface IDirectoryViewProps {
 }
 
 class DirectoryView extends React.Component<IDirectoryViewProps, any> {
-	static navigationOptions = ({ navigation, isMasterDetail }: any) => {
-		const options: any = {
+	static navigationOptions = ({ navigation, isMasterDetail }: IDirectoryViewProps) => {
+		const options: StackNavigationOptions = {
 			title: I18n.t('Directory')
 		};
 		if (isMasterDetail) {
diff --git a/app/views/InviteUsersView/index.tsx b/app/views/InviteUsersView/index.tsx
index b7bf307100..60ae339adc 100644
--- a/app/views/InviteUsersView/index.tsx
+++ b/app/views/InviteUsersView/index.tsx
@@ -40,9 +40,9 @@ interface IInviteUsersViewProps {
 class InviteUsersView extends React.Component<IInviteUsersViewProps, any> {
 	private rid: string;
 
-	static navigationOptions: StackNavigationOptions = {
+	static navigationOptions = (): StackNavigationOptions => ({
 		title: I18n.t('Invite_users')
-	};
+	});
 
 	constructor(props: IInviteUsersViewProps) {
 		super(props);
diff --git a/app/views/LanguageView/index.tsx b/app/views/LanguageView/index.tsx
index 955572e24e..f544fc54fb 100644
--- a/app/views/LanguageView/index.tsx
+++ b/app/views/LanguageView/index.tsx
@@ -134,7 +134,7 @@ class LanguageView extends React.Component<ILanguageViewProps, ILanguageViewStat
 				title={label}
 				onPress={() => this.submit(value)}
 				testID={`language-view-${value}`}
-				right={isSelected ? this.renderIcon : null}
+				right={() => (isSelected ? this.renderIcon() : null)}
 				translateTitle={false}
 			/>
 		);
diff --git a/app/views/LegalView.tsx b/app/views/LegalView.tsx
index 02ac172d9c..6922634180 100644
--- a/app/views/LegalView.tsx
+++ b/app/views/LegalView.tsx
@@ -15,9 +15,9 @@ interface ILegalView {
 }
 
 class LegalView extends React.Component<ILegalView, any> {
-	static navigationOptions: StackNavigationOptions = {
+	static navigationOptions = (): StackNavigationOptions => ({
 		title: I18n.t('Legal')
-	};
+	});
 
 	onPressItem = ({ route }: { route: string }) => {
 		const { server, theme } = this.props;
diff --git a/app/views/MessagesView/index.tsx b/app/views/MessagesView/index.tsx
index c9e3d601d1..dc71ce8424 100644
--- a/app/views/MessagesView/index.tsx
+++ b/app/views/MessagesView/index.tsx
@@ -25,6 +25,8 @@ import { ISubscription, SubscriptionType } from '../../definitions/ISubscription
 interface IMessagesViewProps {
 	user: {
 		id: string;
+		username: string;
+		token: string;
 	};
 	baseUrl: string;
 	navigation: CompositeNavigationProp<
diff --git a/app/views/ModalBlockView.tsx b/app/views/ModalBlockView.tsx
index 1a517745aa..cfb6d7a4b6 100644
--- a/app/views/ModalBlockView.tsx
+++ b/app/views/ModalBlockView.tsx
@@ -15,7 +15,6 @@ import ActivityIndicator from '../containers/ActivityIndicator';
 import { CONTAINER_TYPES, MODAL_ACTIONS } from '../lib/methods/actions';
 import { textParser } from '../containers/UIKit/utils';
 import Navigation from '../lib/Navigation';
-import sharedStyles from './Styles';
 import { MasterDetailInsideStackParamList } from '../stacks/MasterDetailStack/types';
 
 const styles = StyleSheet.create({
@@ -25,10 +24,6 @@ const styles = StyleSheet.create({
 	},
 	content: {
 		paddingVertical: 16
-	},
-	submit: {
-		...sharedStyles.textSemibold,
-		fontSize: 16
 	}
 });
 
@@ -152,24 +147,14 @@ class ModalBlockView extends React.Component<IModalBlockViewProps, IModalBlockVi
 			headerLeft: close
 				? () => (
 						<HeaderButton.Container>
-							<HeaderButton.Item
-								title={textParser([close.text])}
-								style={styles.submit}
-								onPress={this.cancel}
-								testID='close-modal-uikit'
-							/>
+							<HeaderButton.Item title={textParser([close.text])} onPress={this.cancel} testID='close-modal-uikit' />
 						</HeaderButton.Container>
 				  )
 				: undefined,
 			headerRight: submit
 				? () => (
 						<HeaderButton.Container>
-							<HeaderButton.Item
-								title={textParser([submit.text])}
-								style={styles.submit}
-								onPress={this.submit}
-								testID='submit-modal-uikit'
-							/>
+							<HeaderButton.Item title={textParser([submit.text])} onPress={this.submit} testID='submit-modal-uikit' />
 						</HeaderButton.Container>
 				  )
 				: undefined
diff --git a/app/views/PickerView.tsx b/app/views/PickerView.tsx
index db2a7a265a..cf2f99d6d4 100644
--- a/app/views/PickerView.tsx
+++ b/app/views/PickerView.tsx
@@ -48,7 +48,7 @@ interface IPickerViewProps {
 const Item = React.memo(({ item, selected, onItemPress, theme }: IItem) => (
 	<List.Item
 		title={I18n.t(item.label, { defaultValue: item.label, second: item?.second })}
-		right={selected && (() => <List.Icon name='check' color={themes[theme].tintColor} />)}
+		right={() => (selected ? <List.Icon name='check' color={themes[theme].tintColor} /> : null)}
 		onPress={onItemPress}
 		translateTitle={false}
 	/>
diff --git a/app/views/ScreenLockConfigView.tsx b/app/views/ScreenLockConfigView.tsx
index d6307f5e98..76f0d09576 100644
--- a/app/views/ScreenLockConfigView.tsx
+++ b/app/views/ScreenLockConfigView.tsx
@@ -185,7 +185,7 @@ class ScreenLockConfigView extends React.Component<IScreenLockConfigViewProps, I
 				<List.Item
 					title={title}
 					onPress={() => this.changeAutoLockTime(value)}
-					right={this.isSelected(value) ? this.renderIcon : null}
+					right={() => (this.isSelected(value) ? this.renderIcon() : null)}
 					disabled={disabled}
 					translateTitle={false}
 				/>
diff --git a/app/views/SearchMessagesView/index.tsx b/app/views/SearchMessagesView/index.tsx
index 7bc3c17383..70e924d2c4 100644
--- a/app/views/SearchMessagesView/index.tsx
+++ b/app/views/SearchMessagesView/index.tsx
@@ -58,7 +58,11 @@ interface INavigationOption {
 }
 
 interface ISearchMessagesViewProps extends INavigationOption {
-	user: { id: string };
+	user: {
+		id: string;
+		username: string;
+		token: string;
+	};
 	baseUrl: string;
 	serverVersion: string;
 	customEmojis: {
diff --git a/app/views/SelectListView.tsx b/app/views/SelectListView.tsx
index e6d67266ba..6265983b3e 100644
--- a/app/views/SelectListView.tsx
+++ b/app/views/SelectListView.tsx
@@ -5,6 +5,7 @@ import { connect } from 'react-redux';
 import { RadioButton } from 'react-native-ui-lib';
 import { RouteProp } from '@react-navigation/native';
 
+import { ChatsStackParamList } from '../stacks/types';
 import log from '../utils/log';
 import * as List from '../containers/List';
 import I18n from '../i18n';
@@ -17,6 +18,7 @@ import { animateNextTransition } from '../utils/layoutAnimation';
 import { ICON_SIZE } from '../containers/List/constants';
 import SearchBox from '../containers/SearchBox';
 import sharedStyles from './Styles';
+import { IRoom } from '../definitions/IRoom';
 
 const styles = StyleSheet.create({
 	buttonText: {
@@ -26,38 +28,16 @@ const styles = StyleSheet.create({
 	}
 });
 
-interface IData {
-	rid: string;
-	name: string;
-	t?: string;
-	teamMain?: boolean;
-	alert?: boolean;
-}
-
 interface ISelectListViewState {
-	data: IData[];
-	dataFiltered: IData[];
+	data: IRoom[];
+	dataFiltered?: IRoom[];
 	isSearching: boolean;
 	selected: string[];
 }
 
 interface ISelectListViewProps {
-	navigation: StackNavigationProp<any, 'SelectListView'>;
-	route: RouteProp<
-		{
-			SelectView: {
-				data: IData[];
-				title: string;
-				infoText: string;
-				nextAction(selected: string[]): void;
-				showAlert(): void;
-				isSearch: boolean;
-				onSearch(text: string): IData[];
-				isRadio: boolean;
-			};
-		},
-		'SelectView'
-	>;
+	navigation: StackNavigationProp<ChatsStackParamList, 'SelectListView'>;
+	route: RouteProp<ChatsStackParamList, 'SelectListView'>;
 	theme: string;
 	isMasterDetail: boolean;
 }
@@ -73,9 +53,9 @@ class SelectListView extends React.Component<ISelectListViewProps, ISelectListVi
 
 	private isSearch: boolean;
 
-	private onSearch: (text: string) => IData[];
+	private onSearch: (text: string) => Partial<IRoom[]>;
 
-	private isRadio: boolean;
+	private isRadio?: boolean;
 
 	constructor(props: ISelectListViewProps) {
 		super(props);
@@ -142,7 +122,7 @@ class SelectListView extends React.Component<ISelectListViewProps, ISelectListVi
 	search = async (text: string) => {
 		try {
 			this.setState({ isSearching: true });
-			const result = await this.onSearch(text);
+			const result = (await this.onSearch(text)) as IRoom[];
 			this.setState({ dataFiltered: result });
 		} catch (e) {
 			log(e);
@@ -170,19 +150,19 @@ class SelectListView extends React.Component<ISelectListViewProps, ISelectListVi
 		}
 	};
 
-	renderItem = ({ item }: { item: IData }) => {
+	renderItem = ({ item }: { item: Partial<IRoom> }) => {
 		const { theme } = this.props;
 		const { selected } = this.state;
 
 		const channelIcon = item.t === 'p' ? 'channel-private' : 'channel-public';
 		const teamIcon = item.t === 'p' ? 'teams-private' : 'teams';
 		const icon = item.teamMain ? teamIcon : channelIcon;
-		const checked = this.isChecked(item.rid) ? 'check' : null;
+		const checked = this.isChecked(item.rid!) ? 'check' : '';
 
 		const showRadio = () => (
 			<RadioButton
 				testID={selected ? `radio-button-selected-${item.name}` : `radio-button-unselected-${item.name}`}
-				selected={selected.includes(item.rid)}
+				selected={selected.includes(item.rid!)}
 				color={themes[theme].actionTintColor}
 				size={ICON_SIZE}
 			/>
@@ -202,7 +182,7 @@ class SelectListView extends React.Component<ISelectListViewProps, ISelectListVi
 					title={item.name}
 					translateTitle={false}
 					testID={`select-list-view-item-${item.name}`}
-					onPress={() => (item.alert ? this.showAlert() : this.toggleItem(item.rid))}
+					onPress={() => (item.alert ? this.showAlert() : this.toggleItem(item.rid!))}
 					alert={item.alert}
 					left={() => <List.Icon name={icon} color={themes[theme].controlText} />}
 					right={() => (this.isRadio ? showRadio() : showCheck())}
diff --git a/app/views/SelectServerView.tsx b/app/views/SelectServerView.tsx
index e26645d9b0..ac1f329d13 100644
--- a/app/views/SelectServerView.tsx
+++ b/app/views/SelectServerView.tsx
@@ -11,14 +11,15 @@ import RocketChat from '../lib/rocketchat';
 import database from '../lib/database';
 import SafeAreaView from '../containers/SafeAreaView';
 import * as List from '../containers/List';
+import { ShareInsideStackParamList } from '../definitions/navigationTypes';
 
 const getItemLayout = (data: any, index: number) => ({ length: ROW_HEIGHT, offset: ROW_HEIGHT * index, index });
 const keyExtractor = (item: IServer) => item.id;
 
 interface IServer extends Model {
 	id: string;
-	iconURL?: string;
-	name?: string;
+	iconURL: string;
+	name: string;
 }
 
 interface ISelectServerViewState {
@@ -26,7 +27,7 @@ interface ISelectServerViewState {
 }
 
 interface ISelectServerViewProps {
-	navigation: StackNavigationProp<any, 'SelectServerView'>;
+	navigation: StackNavigationProp<ShareInsideStackParamList, 'SelectServerView'>;
 	server: string;
 }
 
@@ -40,7 +41,7 @@ class SelectServerView extends React.Component<ISelectServerViewProps, ISelectSe
 	async componentDidMount() {
 		const serversDB = database.servers;
 		const serversCollection = serversDB.get('servers');
-		const servers: IServer[] = await serversCollection.query(Q.where('rooms_updated_at', Q.notEq(null))).fetch();
+		const servers = (await serversCollection.query(Q.where('rooms_updated_at', Q.notEq(null))).fetch()) as IServer[];
 		this.setState({ servers });
 	}
 
diff --git a/app/views/SettingsView/index.tsx b/app/views/SettingsView/index.tsx
index 3ab35b840c..e77474c4ac 100644
--- a/app/views/SettingsView/index.tsx
+++ b/app/views/SettingsView/index.tsx
@@ -3,7 +3,7 @@ import { Clipboard, Linking, Share } from 'react-native';
 import { connect } from 'react-redux';
 import FastImage from '@rocket.chat/react-native-fast-image';
 import CookieManager from '@react-native-cookies/cookies';
-import { StackNavigationProp } from '@react-navigation/stack';
+import { StackNavigationOptions, StackNavigationProp } from '@react-navigation/stack';
 
 import { SettingsStackParamList } from '../../stacks/types';
 import { logout as logoutAction } from '../../actions/login';
@@ -48,7 +48,7 @@ interface ISettingsViewProps {
 }
 
 class SettingsView extends React.Component<ISettingsViewProps, any> {
-	static navigationOptions = ({ navigation, isMasterDetail }: ISettingsViewProps) => ({
+	static navigationOptions = ({ navigation, isMasterDetail }: ISettingsViewProps): StackNavigationOptions => ({
 		headerLeft: () =>
 			isMasterDetail ? (
 				<HeaderButton.CloseModal navigation={navigation} testID='settings-view-close' />
@@ -181,7 +181,7 @@ class SettingsView extends React.Component<ISettingsViewProps, any> {
 		return (
 			<SafeAreaView testID='settings-view'>
 				<StatusBar />
-				<List.Container testID='settings-view-list'>
+				<List.Container>
 					{isMasterDetail ? (
 						<>
 							<List.Section>
diff --git a/app/views/ShareListView/index.tsx b/app/views/ShareListView/index.tsx
index e4294c6000..ced0badd5f 100644
--- a/app/views/ShareListView/index.tsx
+++ b/app/views/ShareListView/index.tsx
@@ -53,6 +53,9 @@ interface IChat {
 }
 
 interface IServerInfo {
+	id: string;
+	iconURL: string;
+	name: string;
 	useRealName: boolean;
 }
 interface IState {
diff --git a/app/views/ShareView/Header.tsx b/app/views/ShareView/Header.tsx
index 41e5339e1e..604eb93561 100644
--- a/app/views/ShareView/Header.tsx
+++ b/app/views/ShareView/Header.tsx
@@ -5,7 +5,7 @@ import I18n from '../../i18n';
 import { CustomIcon } from '../../lib/Icons';
 import RocketChat from '../../lib/rocketchat';
 import { themes } from '../../constants/colors';
-import { withTheme } from '../../theme';
+import { useTheme } from '../../theme';
 import { isAndroid, isTablet } from '../../utils/deviceInfo';
 import sharedStyles from '../Styles';
 import { makeThreadName } from '../../utils/room';
@@ -37,10 +37,10 @@ const styles = StyleSheet.create({
 interface IHeader {
 	room: { prid?: string; t?: string };
 	thread: { id?: string };
-	theme: string;
 }
 
-const Header = React.memo(({ room, thread, theme }: IHeader) => {
+const Header = React.memo(({ room, thread }: IHeader) => {
+	const { theme } = useTheme();
 	let type;
 	if (thread?.id) {
 		type = 'thread';
@@ -94,4 +94,4 @@ const Header = React.memo(({ room, thread, theme }: IHeader) => {
 	);
 });
 
-export default withTheme(Header);
+export default Header;
diff --git a/app/views/ShareView/index.tsx b/app/views/ShareView/index.tsx
index e91b8a326e..af8b75b274 100644
--- a/app/views/ShareView/index.tsx
+++ b/app/views/ShareView/index.tsx
@@ -116,11 +116,7 @@ class ShareView extends Component<IShareViewProps, IShareViewState> {
 		if (!attachments.length && !readOnly) {
 			options.headerRight = () => (
 				<HeaderButton.Container>
-					<HeaderButton.Item
-						title={I18n.t('Send')}
-						onPress={this.send}
-						buttonStyle={[styles.send, { color: themes[theme].previewTintColor }]}
-					/>
+					<HeaderButton.Item title={I18n.t('Send')} onPress={this.send} />
 				</HeaderButton.Container>
 			);
 		}
@@ -364,7 +360,7 @@ class ShareView extends Component<IShareViewProps, IShareViewState> {
 			<SafeAreaView style={{ backgroundColor: themes[theme].backgroundColor }}>
 				<StatusBar barStyle='light-content' backgroundColor={themes[theme].previewBackground} />
 				{this.renderContent()}
-				<Loading visible={loading} />
+				<Loading visible={loading} theme={theme} />
 			</SafeAreaView>
 		);
 	}
diff --git a/app/views/SidebarView/SidebarItem.tsx b/app/views/SidebarView/SidebarItem.tsx
index bfbf2d2db0..6843732f1c 100644
--- a/app/views/SidebarView/SidebarItem.tsx
+++ b/app/views/SidebarView/SidebarItem.tsx
@@ -8,9 +8,9 @@ import styles from './styles';
 
 interface SidebarItemProps {
 	left: JSX.Element;
-	right: JSX.Element;
+	right?: JSX.Element;
 	text: string;
-	current: boolean;
+	current?: boolean;
 	onPress(): void;
 	testID: string;
 	theme: string;
diff --git a/app/views/SidebarView/index.tsx b/app/views/SidebarView/index.tsx
index c410f63dfb..f406e3261f 100644
--- a/app/views/SidebarView/index.tsx
+++ b/app/views/SidebarView/index.tsx
@@ -45,7 +45,7 @@ interface ISidebarProps {
 		name: string;
 		roles: string[];
 	};
-	theme: string;
+	theme?: string;
 	loadingServer: boolean;
 	useRealName: boolean;
 	allowStatusMessage: boolean;
@@ -177,12 +177,13 @@ class Sidebar extends Component<ISidebarProps, ISidebarState> {
 		const routeName = isMasterDetail ? 'AdminPanelView' : 'AdminPanelStackNavigator';
 		return (
 			<>
-				<Separator theme={theme} />
+				<Separator theme={theme!} />
 				<SidebarItem
 					text={I18n.t('Admin_Panel')}
-					left={<CustomIcon name='settings' size={20} color={themes[theme].titleText} />}
+					left={<CustomIcon name='settings' size={20} color={themes[theme!].titleText} />}
 					onPress={() => this.sidebarNavigate(routeName)}
 					testID='sidebar-admin'
+					theme={theme!}
 					current={this.currentItemKey === routeName}
 				/>
 			</>
@@ -195,30 +196,34 @@ class Sidebar extends Component<ISidebarProps, ISidebarState> {
 			<>
 				<SidebarItem
 					text={I18n.t('Chats')}
-					left={<CustomIcon name='message' size={20} color={themes[theme].titleText} />}
+					left={<CustomIcon name='message' size={20} color={themes[theme!].titleText} />}
 					onPress={() => this.sidebarNavigate('ChatsStackNavigator')}
 					testID='sidebar-chats'
+					theme={theme!}
 					current={this.currentItemKey === 'ChatsStackNavigator'}
 				/>
 				<SidebarItem
 					text={I18n.t('Profile')}
-					left={<CustomIcon name='user' size={20} color={themes[theme].titleText} />}
+					left={<CustomIcon name='user' size={20} color={themes[theme!].titleText} />}
 					onPress={() => this.sidebarNavigate('ProfileStackNavigator')}
 					testID='sidebar-profile'
+					theme={theme!}
 					current={this.currentItemKey === 'ProfileStackNavigator'}
 				/>
 				<SidebarItem
 					text={I18n.t('Display')}
-					left={<CustomIcon name='sort' size={20} color={themes[theme].titleText} />}
+					left={<CustomIcon name='sort' size={20} color={themes[theme!].titleText} />}
 					onPress={() => this.sidebarNavigate('DisplayPrefStackNavigator')}
 					testID='sidebar-display'
+					theme={theme!}
 					current={this.currentItemKey === 'DisplayPrefStackNavigator'}
 				/>
 				<SidebarItem
 					text={I18n.t('Settings')}
-					left={<CustomIcon name='administration' size={20} color={themes[theme].titleText} />}
+					left={<CustomIcon name='administration' size={20} color={themes[theme!].titleText} />}
 					onPress={() => this.sidebarNavigate('SettingsStackNavigator')}
 					testID='sidebar-settings'
+					theme={theme!}
 					current={this.currentItemKey === 'SettingsStackNavigator'}
 				/>
 				{this.renderAdmin()}
@@ -232,7 +237,8 @@ class Sidebar extends Component<ISidebarProps, ISidebarState> {
 			<SidebarItem
 				text={user.statusText || I18n.t('Edit_Status')}
 				left={<Status size={24} status={user?.status} />}
-				right={<CustomIcon name='edit' size={20} color={themes[theme].titleText} />}
+				theme={theme!}
+				right={<CustomIcon name='edit' size={20} color={themes[theme!].titleText} />}
 				onPress={() => this.sidebarNavigate('StatusView')}
 				testID='sidebar-custom-status'
 			/>
@@ -246,12 +252,12 @@ class Sidebar extends Component<ISidebarProps, ISidebarState> {
 			return null;
 		}
 		return (
-			<SafeAreaView testID='sidebar-view' style={{ backgroundColor: themes[theme].focusedBackground }} vertical={isMasterDetail}>
+			<SafeAreaView testID='sidebar-view' style={{ backgroundColor: themes[theme!].focusedBackground }} vertical={isMasterDetail}>
 				<ScrollView
 					style={[
 						styles.container,
 						{
-							backgroundColor: isMasterDetail ? themes[theme].backgroundColor : themes[theme].focusedBackground
+							backgroundColor: isMasterDetail ? themes[theme!].backgroundColor : themes[theme!].focusedBackground
 						}
 					]}
 					{...scrollPersistTaps}>
@@ -260,12 +266,12 @@ class Sidebar extends Component<ISidebarProps, ISidebarState> {
 							<Avatar text={user.username} style={styles.avatar} size={30} />
 							<View style={styles.headerTextContainer}>
 								<View style={styles.headerUsername}>
-									<Text numberOfLines={1} style={[styles.username, { color: themes[theme].titleText }]}>
+									<Text numberOfLines={1} style={[styles.username, { color: themes[theme!].titleText }]}>
 										{useRealName ? user.name : user.username}
 									</Text>
 								</View>
 								<Text
-									style={[styles.currentServerText, { color: themes[theme].titleText }]}
+									style={[styles.currentServerText, { color: themes[theme!].titleText }]}
 									numberOfLines={1}
 									accessibilityLabel={`Connected to ${baseUrl}`}>
 									{Site_Name}
@@ -274,14 +280,14 @@ class Sidebar extends Component<ISidebarProps, ISidebarState> {
 						</View>
 					</TouchableWithoutFeedback>
 
-					<Separator theme={theme} />
+					<Separator theme={theme!} />
 
 					{allowStatusMessage ? this.renderCustomStatus() : null}
 					{!isMasterDetail ? (
 						<>
-							<Separator theme={theme} />
+							<Separator theme={theme!} />
 							{this.renderNavigation()}
-							<Separator theme={theme} />
+							<Separator theme={theme!} />
 						</>
 					) : (
 						<>{this.renderAdmin()}</>
diff --git a/app/views/StatusView.tsx b/app/views/StatusView.tsx
index f369780b82..23fc619dfd 100644
--- a/app/views/StatusView.tsx
+++ b/app/views/StatusView.tsx
@@ -55,9 +55,9 @@ const styles = StyleSheet.create({
 });
 
 interface IUser {
-	id: string;
-	status: string;
-	statusText: string;
+	id?: string;
+	status?: string;
+	statusText?: string;
 }
 
 interface IStatusViewState {
@@ -70,7 +70,7 @@ interface IStatusViewProps {
 	user: IUser;
 	theme: string;
 	isMasterDetail: boolean;
-	setUser: (user: Partial<IUser>) => void;
+	setUser: (user: IUser) => void;
 	Accounts_AllowInvisibleStatusOption: boolean;
 }
 
@@ -144,7 +144,7 @@ class StatusView extends React.Component<IStatusViewProps, IStatusViewState> {
 					value={statusText}
 					containerStyle={styles.inputContainer}
 					onChangeText={text => this.setState({ statusText: text })}
-					left={<Status testID={`status-view-current-${user.status}`} style={styles.inputLeft} status={user.status} size={24} />}
+					left={<Status testID={`status-view-current-${user.status}`} style={styles.inputLeft} status={user.status!} size={24} />}
 					inputStyle={styles.inputStyle}
 					placeholder={I18n.t('What_are_you_doing_right_now')}
 					testID='status-view-input'
diff --git a/app/views/ThemeView.tsx b/app/views/ThemeView.tsx
index 636dec4876..b73e7b9be9 100644
--- a/app/views/ThemeView.tsx
+++ b/app/views/ThemeView.tsx
@@ -117,7 +117,7 @@ class ThemeView extends React.Component<IThemeViewProps> {
 					title={label}
 					onPress={() => this.onClick(item)}
 					testID={`theme-view-${value}`}
-					right={this.isSelected(item) ? this.renderIcon : null}
+					right={() => (this.isSelected(item) ? this.renderIcon() : null)}
 				/>
 				<List.Separator />
 			</>
diff --git a/app/views/ThreadMessagesView/Dropdown/DropdownItem.tsx b/app/views/ThreadMessagesView/Dropdown/DropdownItem.tsx
index d78aa0d74a..c2bbd4960e 100644
--- a/app/views/ThreadMessagesView/Dropdown/DropdownItem.tsx
+++ b/app/views/ThreadMessagesView/Dropdown/DropdownItem.tsx
@@ -24,16 +24,16 @@ const styles = StyleSheet.create({
 
 interface IDropdownItem {
 	text: string;
-	iconName: string;
-	theme: string;
+	iconName: string | null;
+	theme?: string;
 	onPress: () => void;
 }
 
 const DropdownItem = React.memo(({ theme, onPress, iconName, text }: IDropdownItem) => (
-	<Touch theme={theme} onPress={onPress} style={{ backgroundColor: themes[theme].backgroundColor }}>
+	<Touch theme={theme!} onPress={onPress} style={{ backgroundColor: themes[theme!].backgroundColor }}>
 		<View style={styles.container}>
-			<Text style={[styles.text, { color: themes[theme].auxiliaryText }]}>{text}</Text>
-			{iconName ? <CustomIcon name={iconName} size={22} color={themes[theme].auxiliaryText} /> : null}
+			<Text style={[styles.text, { color: themes[theme!].auxiliaryText }]}>{text}</Text>
+			{iconName ? <CustomIcon name={iconName} size={22} color={themes[theme!].auxiliaryText} /> : null}
 		</View>
 	</Touch>
 ));
diff --git a/app/views/ThreadMessagesView/Dropdown/DropdownItemFilter.tsx b/app/views/ThreadMessagesView/Dropdown/DropdownItemFilter.tsx
index 5effd8adb6..6beaa2e77a 100644
--- a/app/views/ThreadMessagesView/Dropdown/DropdownItemFilter.tsx
+++ b/app/views/ThreadMessagesView/Dropdown/DropdownItemFilter.tsx
@@ -1,12 +1,13 @@
 import React from 'react';
 
 import I18n from '../../../i18n';
+import { Filter } from '../filters';
 import DropdownItem from './DropdownItem';
 
 interface IDropdownItemFilter {
 	currentFilter: string;
-	value: string;
-	onPress: (value: string) => void;
+	value: Filter;
+	onPress: (value: Filter) => void;
 }
 
 const DropdownItemFilter = ({ currentFilter, value, onPress }: IDropdownItemFilter): JSX.Element => (
diff --git a/app/views/ThreadMessagesView/Dropdown/index.tsx b/app/views/ThreadMessagesView/Dropdown/index.tsx
index a7a6eca077..d21a78fc59 100644
--- a/app/views/ThreadMessagesView/Dropdown/index.tsx
+++ b/app/views/ThreadMessagesView/Dropdown/index.tsx
@@ -14,12 +14,12 @@ import DropdownItemHeader from './DropdownItemHeader';
 const ANIMATION_DURATION = 200;
 
 interface IDropdownProps {
-	isMasterDetail: boolean;
-	theme: string;
-	insets: EdgeInsets;
+	isMasterDetail?: boolean;
+	theme?: string;
+	insets?: EdgeInsets;
 	currentFilter: Filter;
 	onClose: () => void;
-	onFilterSelected: (value: string) => void;
+	onFilterSelected: (value: Filter) => void;
 }
 
 class Dropdown extends React.Component<IDropdownProps> {
@@ -59,7 +59,7 @@ class Dropdown extends React.Component<IDropdownProps> {
 		});
 		const backdropOpacity = this.animatedValue.interpolate({
 			inputRange: [0, 1],
-			outputRange: [0, themes[theme].backdropOpacity]
+			outputRange: [0, themes[theme!].backdropOpacity]
 		});
 		return (
 			<>
@@ -68,7 +68,7 @@ class Dropdown extends React.Component<IDropdownProps> {
 						style={[
 							styles.backdrop,
 							{
-								backgroundColor: themes[theme].backdropColor,
+								backgroundColor: themes[theme!].backdropColor,
 								opacity: backdropOpacity,
 								top: heightDestination
 							}
@@ -80,8 +80,8 @@ class Dropdown extends React.Component<IDropdownProps> {
 						styles.dropdownContainer,
 						{
 							transform: [{ translateY }],
-							backgroundColor: themes[theme].backgroundColor,
-							borderColor: themes[theme].separatorColor
+							backgroundColor: themes[theme!].backgroundColor,
+							borderColor: themes[theme!].separatorColor
 						}
 					]}>
 					<DropdownItemHeader currentFilter={currentFilter} onPress={this.close} />
diff --git a/app/views/ThreadMessagesView/Item.tsx b/app/views/ThreadMessagesView/Item.tsx
index 6a4025cbb7..688e952297 100644
--- a/app/views/ThreadMessagesView/Item.tsx
+++ b/app/views/ThreadMessagesView/Item.tsx
@@ -59,10 +59,10 @@ const styles = StyleSheet.create({
 interface IItem {
 	item: TThreadModel;
 	baseUrl: string;
-	theme: string;
+	theme?: string;
 	useRealName: boolean;
 	user: any;
-	badgeColor: string;
+	badgeColor?: string;
 	onPress: (item: TThreadModel) => void;
 	toggleFollowThread: (isFollowing: boolean, id: string) => void;
 }
@@ -78,15 +78,15 @@ const Item = ({ item, baseUrl, theme, useRealName, user, badgeColor, onPress, to
 		<Touchable
 			onPress={() => onPress(item)}
 			testID={`thread-messages-view-${item.msg}`}
-			style={{ backgroundColor: themes[theme].backgroundColor }}>
+			style={{ backgroundColor: themes[theme!].backgroundColor }}>
 			<View style={styles.container}>
 				<Avatar style={styles.avatar} text={item?.u?.username} size={36} borderRadius={4} theme={theme} />
 				<View style={styles.contentContainer}>
 					<View style={styles.titleContainer}>
-						<Text style={[styles.title, { color: themes[theme].titleText }]} numberOfLines={1}>
+						<Text style={[styles.title, { color: themes[theme!].titleText }]} numberOfLines={1}>
 							{username}
 						</Text>
-						<Text style={[styles.time, { color: themes[theme].auxiliaryText }]}>{time}</Text>
+						<Text style={[styles.time, { color: themes[theme!].auxiliaryText }]}>{time}</Text>
 					</View>
 					<View style={styles.messageContainer}>
 						<Markdown
@@ -94,7 +94,7 @@ const Item = ({ item, baseUrl, theme, useRealName, user, badgeColor, onPress, to
 							msg={makeThreadName(item)}
 							baseUrl={baseUrl}
 							username={username!}
-							theme={theme}
+							theme={theme!}
 							numberOfLines={2}
 							style={[styles.markdown]}
 							preview
diff --git a/app/views/WorkspaceView/index.tsx b/app/views/WorkspaceView/index.tsx
index 827d6a44e9..5eb6e34dd1 100644
--- a/app/views/WorkspaceView/index.tsx
+++ b/app/views/WorkspaceView/index.tsx
@@ -35,9 +35,9 @@ interface IWorkSpaceProp {
 }
 
 class WorkspaceView extends React.Component<IWorkSpaceProp, any> {
-	static navigationOptions: StackNavigationOptions = {
+	static navigationOptions = (): StackNavigationOptions => ({
 		title: I18n.t('Your_workspace')
-	};
+	});
 
 	get showRegistrationButton() {
 		const { registrationForm, inviteLinkToken, Accounts_iframe_enabled } = this.props;