-
viewof filtro = Inputs.text({ label: "Filtro" })
+
viewof filtro = {
  let input, resolve;
  const form = html`<form>
    <label>Buscar: <input name="busqueda" placeholder="Escribí algo..."></label>
    <button type="submit">Buscar</button>
  </form>`;

  // Creamos un input view para que sea reactive
  const promise = new Promise((res) => (resolve = res));

  form.onsubmit = (event) => {
    event.preventDefault(); // prevenir que se recargue la página
    resolve(input.value);
    input.select(); // opcional, selecciona el texto para otra búsqueda
  };

  input = form.querySelector("input");

  form.value = undefined;
  form.addEventListener("input", () =>
    form.dispatchEvent(new CustomEvent("input"))
  );

  Object.defineProperty(form, "value", {
    get: () => promise
  });

  return form;
}