diff --git a/src/components/common/ChatLink.tsx b/src/components/common/ChatLink.tsx
index f45dfe135..f82bbad27 100644
--- a/src/components/common/ChatLink.tsx
+++ b/src/components/common/ChatLink.tsx
@@ -8,7 +8,7 @@ import Link from '../ui/Link';
 type OwnProps = {
   className?: string;
   chatId?: string;
-  children: any;
+  children: React.ReactNode;
 };
 
 const ChatLink: FC<OwnProps> = ({
diff --git a/src/components/common/GroupCallLink.tsx b/src/components/common/GroupCallLink.tsx
index b11f77b60..cc6bcbc7c 100644
--- a/src/components/common/GroupCallLink.tsx
+++ b/src/components/common/GroupCallLink.tsx
@@ -10,7 +10,7 @@ import { getDispatch } from '../../lib/teact/teactn';
 type OwnProps = {
   className?: string;
   groupCall?: Partial<ApiGroupCall>;
-  children: any;
+  children: React.ReactNode;
 };
 
 const GroupCallLink: FC<OwnProps> = ({
diff --git a/src/components/common/MessageLink.tsx b/src/components/common/MessageLink.tsx
index f105e8549..d41a6d44c 100644
--- a/src/components/common/MessageLink.tsx
+++ b/src/components/common/MessageLink.tsx
@@ -10,7 +10,7 @@ import Link from '../ui/Link';
 type OwnProps = {
   className?: string;
   message?: ApiMessage;
-  children: any;
+  children: React.ReactNode;
 };
 
 const MessageLink: FC<OwnProps> = ({
diff --git a/src/components/common/SafeLink.tsx b/src/components/common/SafeLink.tsx
index 8cd36bcca..065257f9b 100644
--- a/src/components/common/SafeLink.tsx
+++ b/src/components/common/SafeLink.tsx
@@ -12,7 +12,7 @@ type OwnProps = {
   url?: string;
   text: string;
   className?: string;
-  children?: any;
+  children?: React.ReactNode;
   isRtl?: boolean;
 };
 
diff --git a/src/components/common/UiLoader.tsx b/src/components/common/UiLoader.tsx
index a9cb5884f..4d0e07845 100644
--- a/src/components/common/UiLoader.tsx
+++ b/src/components/common/UiLoader.tsx
@@ -23,7 +23,7 @@ import { selectIsRightColumnShown, selectTheme } from '../../modules/selectors';
 
 type OwnProps = {
   page: 'main' | 'authCode' | 'authPassword' | 'authPhoneNumber' | 'authQrCode';
-  children: any;
+  children: React.ReactNode;
 };
 
 type StateProps =
diff --git a/src/components/common/UserLink.tsx b/src/components/common/UserLink.tsx
index 4bd3da652..2342a3aa5 100644
--- a/src/components/common/UserLink.tsx
+++ b/src/components/common/UserLink.tsx
@@ -10,7 +10,7 @@ import { getDispatch } from '../../lib/teact/teactn';
 type OwnProps = {
   className?: string;
   sender?: ApiUser | ApiChat;
-  children: any;
+  children: React.ReactNode;
 };
 
 const UserLink: FC<OwnProps> = ({
diff --git a/src/components/mediaViewer/PanZoom.tsx b/src/components/mediaViewer/PanZoom.tsx
index 6ab922378..220b10e23 100644
--- a/src/components/mediaViewer/PanZoom.tsx
+++ b/src/components/mediaViewer/PanZoom.tsx
@@ -20,7 +20,7 @@ export interface IDragData {
 }
 
 export interface OwnProps {
-  children: any;
+  children: React.ReactNode;
   className?: string;
   noWrap: boolean;
   canPan: boolean;
diff --git a/src/components/middle/message/MentionLink.tsx b/src/components/middle/message/MentionLink.tsx
index bc9e9f41c..8be7f4044 100644
--- a/src/components/middle/message/MentionLink.tsx
+++ b/src/components/middle/message/MentionLink.tsx
@@ -8,7 +8,7 @@ import { selectUser } from '../../../modules/selectors';
 type OwnProps = {
   userId?: string;
   username?: string;
-  children: any;
+  children: React.ReactNode;
 };
 
 type StateProps = {
diff --git a/src/components/ui/Button.tsx b/src/components/ui/Button.tsx
index b2fff6e17..ba9b837d1 100644
--- a/src/components/ui/Button.tsx
+++ b/src/components/ui/Button.tsx
@@ -14,7 +14,7 @@ import './Button.scss';
 export type OwnProps = {
   ref?: RefObject<HTMLButtonElement | HTMLAnchorElement>;
   type?: 'button' | 'submit' | 'reset';
-  children: any;
+  children: React.ReactNode;
   size?: 'default' | 'smaller' | 'tiny';
   color?: (
     'primary' | 'secondary' | 'gray' | 'danger' | 'translucent' | 'translucent-white' | 'translucent-black' | 'dark'
diff --git a/src/components/ui/ConfirmDialog.tsx b/src/components/ui/ConfirmDialog.tsx
index 872de02b4..2891dd457 100644
--- a/src/components/ui/ConfirmDialog.tsx
+++ b/src/components/ui/ConfirmDialog.tsx
@@ -19,7 +19,7 @@ type OwnProps = {
   confirmHandler: () => void;
   confirmIsDestructive?: boolean;
   isButtonsInOneRow?: boolean;
-  children?: any;
+  children?: React.ReactNode;
 };
 
 const ConfirmDialog: FC<OwnProps> = ({
diff --git a/src/components/ui/DropdownMenu.tsx b/src/components/ui/DropdownMenu.tsx
index e74ff89bb..2ee132d6e 100644
--- a/src/components/ui/DropdownMenu.tsx
+++ b/src/components/ui/DropdownMenu.tsx
@@ -13,7 +13,7 @@ type OwnProps = {
   forceOpen?: boolean;
   onOpen?: NoneToVoidFunction;
   onClose?: NoneToVoidFunction;
-  children: any;
+  children: React.ReactNode;
 };
 
 const DropdownMenu: FC<OwnProps> = ({
diff --git a/src/components/ui/FloatingActionButton.tsx b/src/components/ui/FloatingActionButton.tsx
index 225ea1811..8946159ea 100644
--- a/src/components/ui/FloatingActionButton.tsx
+++ b/src/components/ui/FloatingActionButton.tsx
@@ -13,7 +13,7 @@ type OwnProps = {
   ariaLabel?: ButtonProps['ariaLabel'];
   disabled?: boolean;
   onClick: () => void;
-  children: any;
+  children: React.ReactNode;
 };
 
 const FloatingActionButton: FC<OwnProps> = ({
diff --git a/src/components/ui/InfiniteScroll.tsx b/src/components/ui/InfiniteScroll.tsx
index df64a5df5..7bf412c36 100644
--- a/src/components/ui/InfiniteScroll.tsx
+++ b/src/components/ui/InfiniteScroll.tsx
@@ -25,7 +25,7 @@ type OwnProps = {
   noScrollRestoreOnTop?: boolean;
   noFastList?: boolean;
   cacheBuster?: any;
-  children: any;
+  children: React.ReactNode;
 };
 
 const DEFAULT_LIST_SELECTOR = '.ListItem';
diff --git a/src/components/ui/Link.tsx b/src/components/ui/Link.tsx
index 486abaf0b..7aa615b0d 100644
--- a/src/components/ui/Link.tsx
+++ b/src/components/ui/Link.tsx
@@ -5,7 +5,7 @@ import buildClassName from '../../util/buildClassName';
 import './Link.scss';
 
 type OwnProps = {
-  children: any;
+  children: React.ReactNode;
   className?: string;
   isRtl?: boolean;
   onClick?: (e: React.MouseEvent<HTMLAnchorElement>) => void;
diff --git a/src/components/ui/ListItem.tsx b/src/components/ui/ListItem.tsx
index d1a8eaffd..f189c7b4d 100644
--- a/src/components/ui/ListItem.tsx
+++ b/src/components/ui/ListItem.tsx
@@ -30,7 +30,7 @@ interface OwnProps {
   secondaryIcon?: string;
   className?: string;
   style?: string;
-  children: any;
+  children: React.ReactNode;
   disabled?: boolean;
   ripple?: boolean;
   narrow?: boolean;
diff --git a/src/components/ui/Menu.tsx b/src/components/ui/Menu.tsx
index 7291b45ba..55a6a6691 100644
--- a/src/components/ui/Menu.tsx
+++ b/src/components/ui/Menu.tsx
@@ -33,7 +33,7 @@ type OwnProps = {
   onClose?: () => void;
   onMouseEnter?: (e: React.MouseEvent<HTMLDivElement, MouseEvent>) => void;
   onMouseLeave?: (e: React.MouseEvent<HTMLDivElement, MouseEvent>) => void;
-  children: any;
+  children: React.ReactNode;
 };
 
 const ANIMATION_DURATION = 200;
diff --git a/src/components/ui/MenuItem.tsx b/src/components/ui/MenuItem.tsx
index 54d68310f..13b1e895c 100644
--- a/src/components/ui/MenuItem.tsx
+++ b/src/components/ui/MenuItem.tsx
@@ -10,7 +10,7 @@ type OnClickHandler = (e: React.SyntheticEvent<HTMLDivElement | HTMLAnchorElemen
 type OwnProps = {
   icon?: string;
   className?: string;
-  children: any;
+  children: React.ReactNode;
   onClick?: OnClickHandler;
   href?: string;
   download?: string;
diff --git a/src/components/ui/Modal.tsx b/src/components/ui/Modal.tsx
index bcfdbbcff..3de9231c2 100644
--- a/src/components/ui/Modal.tsx
+++ b/src/components/ui/Modal.tsx
@@ -28,7 +28,7 @@ type OwnProps = {
   header?: any;
   hasCloseButton?: boolean;
   noBackdrop?: boolean;
-  children: any;
+  children: React.ReactNode;
   onClose: () => void;
   onCloseAnimationEnd?: () => void;
   onEnter?: () => void;
diff --git a/src/components/ui/Portal.ts b/src/components/ui/Portal.ts
index 7ce2563d8..3a61c0376 100644
--- a/src/components/ui/Portal.ts
+++ b/src/components/ui/Portal.ts
@@ -1,10 +1,10 @@
-import { FC, useRef, useLayoutEffect } from '../../lib/teact/teact';
+import { FC, useRef, useLayoutEffect, VirtualElement } from '../../lib/teact/teact';
 import TeactDOM from '../../lib/teact/teact-dom';
 
 type OwnProps = {
   containerId?: string;
   className?: string;
-  children: any;
+  children: React.ReactNode;
 };
 
 const Portal: FC<OwnProps> = ({ containerId, className, children }) => {
@@ -32,7 +32,7 @@ const Portal: FC<OwnProps> = ({ containerId, className, children }) => {
     };
   }, [className, containerId]);
 
-  return TeactDOM.render(children, elementRef.current);
+  return TeactDOM.render(children as VirtualElement, elementRef.current);
 };
 
 export default Portal;
diff --git a/src/components/ui/SearchInput.tsx b/src/components/ui/SearchInput.tsx
index a09650d14..4bcf0739f 100644
--- a/src/components/ui/SearchInput.tsx
+++ b/src/components/ui/SearchInput.tsx
@@ -16,7 +16,7 @@ import './SearchInput.scss';
 
 type OwnProps = {
   ref?: RefObject<HTMLInputElement>;
-  children?: any;
+  children?: React.ReactNode;
   parentContainerClassName?: string;
   className?: string;
   inputId?: string;
diff --git a/src/components/ui/Select.tsx b/src/components/ui/Select.tsx
index 53bdcd402..6bd4ad071 100644
--- a/src/components/ui/Select.tsx
+++ b/src/components/ui/Select.tsx
@@ -12,7 +12,7 @@ type OwnProps = {
   hasArrow?: boolean;
   placeholder?: string;
   onChange?: (e: ChangeEvent<HTMLSelectElement>) => void;
-  children: any;
+  children: React.ReactNode;
 };
 
 const Select: FC<OwnProps> = (props) => {