import type { MailtoField, MailtoOptions } from './options.js';
/**
 * Fields of the main tab and of the "Additional" tab. The main tab is the short form: To, the fields set to `'main'`
 * and the link text. The "Additional" tab is the full form with every shown field. There is no "Additional" tab
 * when no field is set to `'additional'`. A required field that is hidden goes to the main tab.
 */
export declare function layout(options: MailtoOptions): {
    main: MailtoField[];
    additional: MailtoField[];
};