/**
 * Parse viewport meta tag content string into a Map of properties.
 * Pure function with no side effects.
 *
 * @example
 * parseViewportContent("width=device-width, initial-scale=1.0")
 * // Returns: Map { "width" => "device-width", "initial-scale" => "1.0" }
 *
 * @param content - The viewport content attribute value
 * @returns Map of viewport properties
 */
declare function parseViewportContent(content: string): Map<string, string>;
/**
 * Serialize a Map of viewport properties back into content string format.
 * Pure function with no side effects.
 *
 * @example
 * const map = new Map([["width", "device-width"], ["initial-scale", "1.0"]]);
 * serializeViewportContent(map)
 * // Returns: "width=device-width, initial-scale=1.0"
 *
 * @param viewportMap - Map of viewport properties
 * @returns Viewport content string ready for meta tag
 */
declare function serializeViewportContent(viewportMap: Map<string, string>): string;

export { parseViewportContent, serializeViewportContent };