StyleSheet resolveShadowValue.js

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  /**
 * Copyright (c) Nicolas Gallagher.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */
 
import normalizeColor from '../../modules/normalizeColor';
import normalizeValueWithProperty from './normalizeValueWithProperty';
 
const defaultOffset = { height: 0, width: 0 };
 
const resolveShadowValue = (style: Object): void | string => {
  const { shadowColor, shadowOffset, shadowOpacity, shadowRadius } = style;
  const { height, width } = shadowOffset || defaultOffset;
  const offsetX = normalizeValueWithProperty(width);
  const offsetY = normalizeValueWithProperty(height);
  const blurRadius = normalizeValueWithProperty(shadowRadius || 0);
  const color = normalizeColor(shadowColor || 'black', shadowOpacity);
  Eif (color != null && offsetX != null && offsetY != null && blurRadius != null) {
    return `${offsetX} ${offsetY} ${blurRadius} ${color}`;
  }
};
 
export default resolveShadowValue;