import { ColorSchemeName } from 'react-native';
/**
 * React Native 0.86 widened `ColorSchemeName` with `'unspecified'`, which means
 * "no preference expressed" rather than a real scheme. Everything downstream
 * only understands light/dark, so collapse it (and `undefined`) to `null`.
 */
export declare const normalizeColorScheme: (scheme: ColorSchemeName | "light" | "dark" | null | undefined) => "light" | "dark" | null;
/**
 * Custom hook that returns the color scheme from Chat context if provided,
 * otherwise falls back to the system color scheme from React Native.
 *
 * @returns The current color scheme ('light', 'dark', or null)
 */
export declare function useColorScheme(): "light" | "dark" | null;
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