/**
 * Merges meta tags from the source HTML head into the destination HTML head.
 * Existing meta tags with matching property attributes are replaced; others are appended.
 * @param destination - The base HTML string to merge into.
 * @param source - The HTML string whose head meta tags will be merged.
 * @returns The merged HTML string.
 */
export declare const mergeDocumentHead: (destination: string, source: string) => string;
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