# Upgrade to v10 (theming V2)

The release v10 brings some new features as well as some breaking changes to the users. The main focus was to support [the next version of theming V2](/chat/docs/sdk/react/theming/themingv2/) brought with `@stream-io/stream-chat-css@3.0.0`. It lead to addition resp. removal of some HTML elements in few components. This may invalidate some of your CSS selectors. Also, some components marked as deprecated for a longer period of time have been removed.

We have tried to introduce as few breaking changes as possible. We have not removed classes but rather added new ones that are exclusively used with the theming V2 stylesheet. Also, where possible, V1 and V2 components have been introduced for backwards compatibility (the V1 components are used unless opted into theme version 2).

Your upgrade strategy may differ based on whether you would like to make use of the new theming V2 or just do the necessary adjustments.

## Changes impacting all the users

### Components removed from the SDK

The following components have been removed from our code base:

1. MessageCommerce
2. MessageLivestream
3. MessageTeam

### Markup and component API changes

#### ChannelSearch

We have renamed the prop `DropdownContainer` to `SearchResultsList` to better reflect the purpose of the component. The search results do not have to be shown in a drop-down container.

Also, redundant `setResultsOpen` is not part of the type `ChannelSearchFunctionParams` anymore. This has impact on `onSelectResult` and `searchFunction` props

#### ChannelPreview

The `ChannelPreviewMessenger` component has received adjustments in markup - a new element to display the unread count has been added. You can target it with the class `str-chat__channel-preview-unread-badge` for further styling.

#### MessageList

The message list loading indicator is now wrapped in a div with class `str-chat__list__loading` so that you can target it better in your stylesheets.

You can now customize `LoadingIndicator` component through the `Channel` props.

There is a new prop `head` that allows you to render a custom React Element at top of the list. In the SDK it is used by the `Thread` component to display parent message.

#### VirtualizeMessageList

The default message component in virtualized Thread is now `MessageSimple` and not `FixedHeightMessage`. The `FixedHeightMessage` component has been deprecated and will be removed in the next release v11.

Moreover, we have added a new prop `groupStyles` with the same purpose as in [non-virtualized `MessageList`](/chat/docs/sdk/react/components/core-components/message_list#groupstyles/).

#### Thread

Thread is actually a message list, but it has its own specifics. It always displays at least one message and that is the original parent message. With the release of the SDK v10, the parent message scroll behavior was unified. Now the parent message is part of the scroll container in both `MessageList` as well as `VirtualizedMessageList`. The part rendering the parent message and its separator from the rest of the replies is contained in a new component [ThreadHead](https://github.com/GetStream/stream-chat-react/blob/master/src/components/Thread/ThreadHead.tsx). You can provide your own custom implementation through a `Channel` prop `ThreadHead`. You can even override the separator by passing its substitute to the `Channel` prop `ThreadStart`.

On the other hand, the [ThreadHeader](https://github.com/GetStream/stream-chat-react/blob/master/src/components/Thread/ThreadHeader.tsx) component has experience markup changes. The `div` elements with classes `str-chat__thread-header-title` and `str-chat__thread-header-subtitle` have replaced elements `strong` and `small` in the header details. Thread now accepts two new props `overrideImage` (expects the image URL) and `overrideTitle` (expects custom title). Otherwise, the image and title are be extracted from the active channel object.

The other change (fix) brought with the release is that the thread is scrolled to the bottom when open.

#### EmptyStateIndicator

The default component used to represent empty state in message list or channel list as been enriched with an SVG image:

<gallery>

![Image of empty channel list](@chat-sdk/react/v13-latest/_assets/theme-v2-empty-channel-list.png)

![Image of empty message list](@chat-sdk/react/v13-latest/_assets/theme-v2-empty-message-list.png)

</gallery>

#### MessageNotifications

We have added a new component [ScrollToBottomButton](https://github.com/GetStream/stream-chat-react/blob/master/src/components/MessageList/ScrollToBottomButton.tsx). It allows you to notify users about new messages by displaying the unread count of messages in the active message list. Besides that it also serves as a scroll-to-bottom button when a user scrolls up. The threshold that determines, whether the button should be displayed can be set via `MessageList` (prop `scrolledUpThreshold`). Default value is 200px. The `VirtualizedMessageList` works with the same threshold, but not configurable. You can start using this component instead of the older version by passing it to `Channel` prop `MessageNotification`.

<gallery>

![Image of a new component ScrollToBottomButton](@chat-sdk/react/v13-latest/_assets/theme-v2-scroll-to-bottom-button-theme-v1.png)

</gallery>

#### Message

Even if you do not upgrade to theme V2, you should be aware that the message text is now grouped with message attachments into one `div` with class `str-chat__message-bubble`.

#### Attachment

Attachments are now rendered in a fixed order from top to bottom:

1. card,
2. gallery
3. image
4. media
5. audio
6. file

Another potentially breaking change is that the `Card` is not the default component to be rendered. If the provided `attachment` object is not identified as any of the above listed attachment types, its content is not rendered. The `Card` component is intended for display of scraped content. Remember that the attachment is now considered to carry scraped content only if it has `og_scrape_url` or `title_link` attributes. This is in order to comply with the chat API requirements.

The attachment list is newly rendered within a `div` with class `str-chat__attachment-list`.

Previous to v10 of the SDK, we used render functions to return React Elements. The render functions are now deprecated and [AttachmentContainer](https://github.com/GetStream/stream-chat-react/blob/master/src/components/Attachment/AttachmentContainer.tsx) components are used instead. This allows you to make use of all the React features while rendering different attachment types.

All the image and video attachments are now expandable to the full-screen mode. This applies to scraped media as well.

**Image attachments**

Besides that, you can expect the SVG images to be rendered on the chessboard background now:

<gallery>

![SVG attachment rendering](@chat-sdk/react/v13-latest/_assets/theme-v2-svg-attachment.png)

</gallery>

The `Image` component now accepts new `dimensions` prop - object containing the image `height` and `width`.

Multiple images uploaded in a message are rendered within a gallery. You can newly provide your custom `ModalGallery` component through a prop to `Channel` component. `ModalGallery` is passed the image array and the index of the image to be displayed.

#### Message reactions

The `Emoji` in the `ReactionSelector` has been wrapped in a `span` element with class `str-chat__message-reaction-emoji`. It allows us to control the height and alignment of the icon. To highlight the already selected emojis you can use newly added class `str-chat__message-reactions-option-selected`.

The `ReactionList` now populates emoji tooltips with aggregated list of usernames who have already reacted with the given reaction.

We have introduced a new prop `own_reactions` to both `ReactionSelector` and `ReactionList` that allows us to determine, whether the user has already reacted with a given reaction.

#### MessageInput

The `MessageInputSmall` component has been now been made redundant and was deprecated. We encourage the use of `MessageInputFlat` UI component only.

## Opting into theme V2

The majority of new features introduced with this release is bound to the use of the new theming V2. The list is as follows:

### Theme

The theme should be set via `Chat` component prop `theme`. Internally it is placed on

1. the container wrapping the channel search and channel list and
2. the container wrapping the active channel UI

The new theming V2 provides default styles if no theme class is set. These styles are equivalent to those if class `str-chat__theme-light` is passed to the `theme` prop. If you would like to get the dark theme, you should pass `str-chat__theme-dark` instead.

### Changes in the channel list container

#### ChannelSearch

The `ChannelSearch` component has been revamped and upgraded. It now provides richer functionality and wider possibilities of customization for those, who opt into use of theme V2. The component capabilities are described in [ChannelSearch documentation](/chat/docs/sdk/react/components/utility-components/channel_search/) in more depth

#### ChannelPreview

We started to use component `ChannelPreview` to display search results. That is why the new prop `onSelect` has been added to its API. You can customize what happens, when the search result is selected.

### Changes in the channel pane

#### MessageList

We have wrapped it in a new div with class `str-chat__main-panel-inner` for those using theme version 2.

#### Message

The markup of component rendering the message with its attachments, reactions, avatar etc. has been changed specifically for theme V2. The message metadata (author, timestamp), reply button, have been moved from `str-chat__message-inner` one level higher to the message root div.

#### Attachment

The API of the `Attachment` component or components that render a specific content type has not changed, you should be able to upgrade seamlessly. What you have to however expect is changed markup.

**File attachments**

The file attachment component used for theming V2 has changed markup compared to the V2. Also, a new set of file attachment icons has been applied:

<gallery>

![Image of standard file attachment icon set](@chat-sdk/react/v13-latest/_assets/file-attachment-icon-set-v2-standard.png)

![Image of alternative file attachment icon set](@chat-sdk/react/v13-latest/_assets/file-attachment-icon-set-v2-alt.png)

</gallery>

Our `FileAttachment` component for theming V2 uses the standard icon set. You can however use the alternative set in your custom components:

So instead of:

```tsx
<FileIcon
  className="str-chat__file-icon"
  mimeType={attachment.mime_type}
  version={"2"}
/>
```

You can do:

```tsx {5}
<FileIcon
  className="str-chat__file-icon"
  mimeType={attachment.mime_type}
  version={"2"}
  type={"alt"}
/>
```

Besides that, the file attachment widgets newly display a download button (a download link).

**Audio attachments**

Audio attachments are rendered with a new component (with different markup) adapted to the theming V2 styles.

**Scraped attachments (Card)**

Cards now display scraped audio, video or image content:

<gallery>

![Image of audio card with theme V2](@chat-sdk/react/v13-latest/_assets/theme-v2-card-audio.png)

![Image of the video attachment card for the theme V2](@chat-sdk/react/v13-latest/_assets/theme-v2-card-video.png)

![Image of the default attachment card for theme V2](@chat-sdk/react/v13-latest/_assets/theme-v2-card-image.png)

</gallery>

#### Tooltip

`Tooltip` is now being rendered with the help of the [`PopperJS`](https://popper.js.org/) to keep the content of the tooltip in the viewport longer when the tooltip origin (could be a button) is scrolled out of the viewport bounds.

#### MessageInputFlat

When opting to theme V2, the integrator gets revamped message input UI component where the markup differs completely from the original.

`QuotedMessagePreviewHeader` has been extracted from the `QuotedMessagePreview` component and moved directly to the `MessageInputFlat` due to positioning reasons. Users will have the ability to replace this component with custom component in the future (see [#1764](https://github.com/GetStream/stream-chat-react/issues/1764)).

`EmojiPicker` is now being rendered with the help of the [`PopperJS`](https://popper.js.org/) to keep the picker in the viewport longer when the picker origin (button) is scrolled out of the viewport bounds.

`SendButton` is now disabled by default if there isn't any content to be submitted, i.e. there are no attachments or no text content.

Default `UploadsPreview` has been renamed to [AttachmentPreviewList](https://github.com/GetStream/stream-chat-react/blob/master/src/components/MessageInput/AttachmentPreviewList.tsx) and is no longer imported from the package `react-file-utils` but instead now lives within `stream-chat-react` code-base. Users will have the ability to replace this component with custom component in the future (see [#1299](https://github.com/GetStream/stream-chat-react/issues/1299)).

---

This page was last updated at 2025-08-15T14:16:08.991Z.

For the most recent version of this documentation, visit [https://getstream.io/chat/docs/sdk/react/release-guides/upgrade-to-v10/](https://getstream.io/chat/docs/sdk/react/release-guides/upgrade-to-v10/).