PdfAnnotationBorder API in JavaScript PDF API control

// Load an existing PDF document
let document: PdfDocument = new PdfDocument(data, password);
// Get the first page
let page: PdfPage = document.getPage(0) as PdfPage;
// Get the first annotation of the page
let annotation: PdfLineAnnotation = page.annotations.at(0) as PdfLineAnnotation;
// Initializes a new instance of the ` PdfAnnotationBorder ` class.
let border: PdfAnnotationBorder = new PdfAnnotationBorder ();
//Sets the width of the annotation border.
border.width = 10;
//Sets the style of the annotation border.
border.style = PdfBorderStyle.dashed;
//Sets the dash pattern of the annotation border.
border.dash = [1, 2, 1];
// Sets the border to the PDF form field
annotation.border = border;
// Destroy the document
document.destroy();