/**
 * Internal dependencies
 */
import type { Resource } from './types';
/**
 * Returns a valid srcSet attribute value for the given media resource.
 *
 * @param resource The resource.
 * @return The srcSet value, or null if the resource has no `sizes`
 * attribute.
 */
declare function calculateSrcSet(resource: Resource): string | null;
export default calculateSrcSet;
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