import { type MarkedCallback } from './shared';
type AddStyleFromCss = MarkedCallback & {
    /**
     * URL-encoded CSS text to write to a custom style.
     */
    css: string;
    /**
     * Style name used for both the CSS filename and menu item.
     */
    name: string;
    file?: never;
};
type AddStyleFromFile = MarkedCallback & {
    /**
     * Full POSIX path to a CSS file to add to Marked.
     */
    file: string;
    /**
     * Menu item name. If omitted, Marked uses the filename.
     */
    name?: string;
    css?: never;
};
/**
 * Add style payload definition.
 */
export type AddStyle = AddStyleFromCss | AddStyleFromFile;
/**
 * Add a custom CSS style to Marked.
 *
 * @param payload Add style payload.
 * @returns Marked addstyle URL.
 * @example
 * addStyle({ name: 'My new style', css: 'body { color: red; }' })
 * // => 'x-marked://addstyle?name=My%20new%20style&css=body%20%7B%20color:%20red%3B%20%7D'
 * @example
 * addStyle({ file: '/Users/myuser/Custom Styles/Unicorn.css' })
 * // => 'x-marked://addstyle?file=/Users/myuser/Custom%20Styles/Unicorn.css'
 * @link https://marked2app.com/help/URL_Handler.html#addstyle
 */
export declare function addStyle(payload: AddStyle): string;
export {};