cometchat-react-native-customization by @cometchat

Ground truth: @cometchat/chat-uikit-react-native@5 + catalog rn-v5.json. Docs: /ui-kit/react-native/theme · colors · component-styling · message-bubble-styling. Fetch token names and style keys from docs — never invent them.

Companion skills (read first)

cometchat-react-native-core — install, provider chain, init→login→render. Assumed, not repeated here.

Use this skill when

"change the chat colors" · "brand the chat UI" · "dark mode" · "restyle the bubbles"
"custom message type" · "render my own bubble" · "add an option to the message menu"

Prerequisites & install

None beyond core. Theming needs CometChatThemeProvider already in the chain (see core).

Customization mechanism — three layers, cheapest first

There is no CSS. No stylesheets, no className, no --cometchat-* variables. If you are holding a React snippet with CSS custom properties, it does not apply here.

Layer 1 — theme mode + color tokens (whole app)

The provider takes a theme prop shaped { mode, light, dark }. mode is "light" · "dark" · "auto" — "auto" is what makes the kit follow the device (OS) light/dark setting (it reads useColorScheme()); the provider default is already "auto".

// Fixed dark for the whole app.
<CometChatThemeProvider theme={{ mode: "dark" }}>{/* … */}</CometChatThemeProvider>

// Follow the OS, branded in BOTH schemes. mode:"auto" is the switch;
// set BOTH light and dark or dark falls back to defaults.
<CometChatThemeProvider
  theme={{
    mode: "auto",
    light: { color: { primary: "#F76808" } },
    dark: { color: { primary: "#F8935B" } },
  }}
>
  {/* … */}
</CometChatThemeProvider>

primary drives buttons, outgoing bubbles and active states — it is usually the only token a brand change needs. Other common tokens: textPrimary, background1, neutral50, extendedPrimary500. Fetch the full list from /ui-kit/react-native/colors.md rather than guessing a token name.

To follow the OS, use mode: "auto" and set both light and dark. Without the provider, system theme changes are not reflected at all.

Layer 2 — per-component style objects

Every component takes a style prop holding named sub-style objects — plain RN style objects, not CSS:

<CometChatConversations style={{ containerStyle: { backgroundColor: "#F7F7F7" } }} />

The same style keys can be set globally through the theme instead, which is preferable when the change should apply everywhere:

<CometChatThemeProvider theme={{ light: { conversationStyles: { /* … */ } } }}>

Style-key names differ per component. Fetch them from that component's page (/ui-kit/react-native/component-styling.md and the component's own page) — do not pattern-match from another component.

Layer 3 — read the active theme in your own views

useTheme() returns the resolved theme (already light-or-dark per mode), so custom views match the kit without re-deriving the palette:

import { useTheme } from "@cometchat/chat-uikit-react-native";
import { Text } from "react-native";

const Label = () => {
  const theme = useTheme();
  return <Text style={{ color: theme.color.textPrimary }}>Chats</Text>;
};

Custom message types — the DataSource decorator chain

⚠️ RN does NOT have the React plugin API. CometChatMessagePlugin and CometChatPluginRegistry do not exist in this kit; emitting them will not compile. RN uses a decorator chain.

Extend DataSourceDecorator, override what you need, and register it with ChatConfigurator.enable:

import {
  ChatConfigurator, DataSourceDecorator, CometChatMessageTemplate,
} from "@cometchat/chat-uikit-react-native";

const ORDER_TYPE = "order";

class OrderDataSource extends DataSourceDecorator {
  // 0. IDENTITY — REQUIRED. The base DataSourceDecorator.getId() THROWS
  // ("Method not implemented.") and ChatConfigurator.enable() calls getId() to
  // dedupe the registry — so a subclass without this override crashes at
  // ChatConfigurator.enable(...), NOT at render. Return a stable, unique id.
  getId(): string {
    return "order_message_datasource";
  }

  // 1. RENDER — how the bubble draws.
  getAllMessageTemplates(theme?: any, params?: any): CometChatMessageTemplate[] {
    const templates = super.getAllMessageTemplates(theme, params);
    // append or replace a template here
    return templates;
  }

  // 2. FETCH — WITHOUT THESE TWO THE MESSAGE IS NEVER RETRIEVED.
  // CometChatMessageList builds its request from them:
  //   requestBuilder.setTypes(ChatConfigurator.dataSource.getAllMessageTypes())
  //   requestBuilder.setCategories(ChatConfigurator.dataSource.getAllMessageCategories())
  // A type absent from those filters is excluded server-side. The bubble appears
  // optimistically when sent, then vanishes on reload — with no error anywhere.
  getAllMessageTypes(): string[] {
    return [...super.getAllMessageTypes(), ORDER_TYPE];
  }

  getAllMessageCategories(): string[] {
    const categories = super.getAllMessageCategories();
    return categories.includes(CometChat.CATEGORY_CUSTOM)
      ? categories
      : [...categories, CometChat.CATEGORY_CUSTOM];
  }
}

// AFTER login(), not merely after init(). CometChatUIKit.login() calls enableExtensions(),
// whose first statement is ChatConfigurator.init() — "re-initialize data source". Anything
// registered earlier is DISCARDED, so a decorator wired at module scope, or straight after
// init(), silently disappears.
await CometChatUIKit.login({ uid: UID });
ChatConfigurator.enable((source) => new OrderDataSource(source));

getId() is REQUIRED on every DataSourceDecorator subclass. It is the ONE base method that does not delegate to the wrapped source — the base throws Error("Method not implemented."), and ChatConfigurator.enable() calls getId() to dedupe the registry. Omit it and registration crashes at ChatConfigurator.enable(...) with Method not implemented. — NOT at render, so it reads as unrelated. Every built-in decorator (Polls, Stickers, Translation, LinkPreview, Collaborative*) overrides it; yours must too, returning a stable unique string.

A custom message type is two halves, and only one of them is obvious. Render is getAllMessageTemplates / getMessageTemplate. Fetch is getAllMessageTypes / getAllMessageCategories. Ship the render half alone and everything looks right until the first reload, when every message of your type is gone — no error, no warning.

DataSourceDecorator exposes ~50 overridable methods; the ones you usually want are getId (mandatory — see above), getAllMessageTemplates, getMessageTemplate, getAllMessageTypes, getAllMessageCategories, getMessageOptions (the long-press menu) and getAuxiliaryOptions (composer actions). Always call super.<method>(...) and modify the result — replacing it wholesale drops every built-in message type.

DOCS GAP (RN-G10): DataSourceDecorator / MessageDataSource / ExtensionsDataSource and ChatConfigurator.enable are not documented on any RN page — the docs show only mutating existing templates via getAllMessageTemplates(). Built from the kit source; flag this to the developer rather than presenting it as documented.

Partially closed (2026-08-20). ui-kit/react-native/message-list now documents the half that actually breaks builds: a custom type must be registered for fetch (getAllMessageTypes / getAllMessageCategories), not only for render, and the decorator must be registered after login() because enableExtensions() re-runs ChatConfigurator.init(). Still missing: a dedicated RN custom-message-types page covering DataSourceDecorator / MessageDataSource / ExtensionsDataSource end to end. Owner: docs.

Customizing an existing bubble without a decorator

To restyle rather than replace, prefer the theme's bubble style keys — textBubbleStyles, imageBubbleStyles, fileBubbleStyles, pollBubbleStyles and siblings. Fetch exact keys from /ui-kit/react-native/message-bubble-styling.md.

Common pitfalls

Reaching for CSS — no stylesheets, no className, no --cometchat-*. Theme object + RN styles.
Emitting the React plugin API — does not exist; use ChatConfigurator + DataSourceDecorator.
Omitting getId() on a decorator — the base throws; ChatConfigurator.enable() calls it → crash at registration with Method not implemented.
Not calling super in a decorator override — silently drops all built-in templates.
Setting only light when the app follows the OS — dark mode then falls back to defaults.
Guessing token or style-key names — fetch them; a wrong key fails silently rather than erroring.

Verify it works

Every symbol appears in catalogs/rn-v5.json.
npm run verify:fences:rn-v5 compiles the examples against the pinned kit.
On device: toggle OS dark mode and confirm the surface follows; confirm a custom template renders and built-in types still render alongside it.