react-native
Version:
A framework for building native apps using React
28 lines (26 loc) • 689 B
JavaScript
/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow strict
* @format
*/
/**
* Combines two styles such that `style2` will override any styles in `style1`.
* If either style is null or undefined, the other one is returned without
* allocating an array, saving allocations and enabling memoization.
*/
export default function composeStyles<T, U: T, V: T>(
style1: ?U,
style2: ?V,
): ?(T | $ReadOnlyArray<T>) {
if (style1 == null) {
return style2;
}
if (style2 == null) {
return style1;
}
return [style1, style2];
}