interface HelpViewer {
    collection?: string;
}
/**
 * Open Help Viewer app.
 *
 * @param payload - Optional collection identifier.
 * @returns Help Viewer open URL.
 * @example
 * helpViewer()
 * // => 'x-apple-tips://'
 * @example
 * helpViewer({ collection: 'WelcomeToMac' })
 * // => 'x-apple-tips://open?collection=WelcomeToMac'
 */
export declare function helpViewer(payload?: HelpViewer): string;
export {};