/**
 * Opens a new window with a form that auto-submits via POST to the target URL.
 * The new window then closes (after 2 seconds), and once closed,
 * the "imprimir" page is opened in a new window.
 *
 * @param {string} chaveUnica - The ChaveUnica value.
 * @param {string} devedorPrincipal - A CPF (11 digits) or CNPJ (14 digits).
 */
export declare function openFormThenRedirect(chaveUnica: string, devedorPrincipal: string): void;