/**
 * useSx — converts an `SxProps` value into a React Native `ViewStyle`.
 *
 * @param sx    The sx prop (object, array, or undefined/null/false).
 * @param theme The current `Theme` (obtained from `useTheme().theme` by the caller).
 * @returns     A React Native style object, or `undefined` when `sx` is falsy.
 *
 * Design decisions (see research.md):
 *  - Zero-allocation fast path: when `sx` is falsy, `undefined` is returned
 *    immediately without any object creation (D5).
 *  - Array notation is supported: falsy items (null, false, undefined) are
 *    filtered out; remaining objects are merged left→right.
 *  - Breakpoints use `useWindowDimensions().width`; resolved once per render
 *    and shared across all responsive properties (xs/sm/md/lg/xl).
 *  - CSS-only properties (pseudo-selectors, @media strings, etc.) are silently
 *    dropped with a `// RN-DEVIATION:` comment.
 *  - The result is memoized on `[sx, viewportWidth]` to avoid re-allocation.
 *
 * @example
 * const sxStyle = useSx(props.sx, theme);
 * <View style={StyleSheet.flatten([ownStyles, sxStyle, props.style])} />
 */
import type { ViewStyle } from 'react-native';
import type { SxProps } from '../types/shared';
import type { Theme } from '../theme/types';
/**
 * Converts `SxProps` to a React Native `ViewStyle` (or `undefined` when falsy).
 * Memoized on `[sx, viewportWidth]`.
 */
export declare function useSx(sx: SxProps | undefined, theme: Theme): ViewStyle | undefined;
//# sourceMappingURL=useSx.d.ts.map