How to use the pdf-lib.drawEllipse function in pdf-lib

font: HELVETIVA_FONT,
    size: 12,
  }),
  // Now we'll draw the Unicorn image on the page's content stream. We'll
  // position it a little bit below the text we just drew, and we'll center it
  // within the page.
  drawImage(UNICORN_JPG, {
    x: PAGE_1_WIDTH * 0.5 - UNICORN_JPG_WIDTH * 0.5,
    y: PAGE_1_HEIGHT * 0.5,
    width: UNICORN_JPG_WIDTH,
    height: UNICORN_JPG_HEIGHT,
  }),
  // Finally, let's draw an ellipse on the page's content stream. We'll draw it
  // below the image we just drew, and we'll center it within the page. We'll
  // color it cyan, with a purple border.
  drawEllipse({
    x: PAGE_1_WIDTH * 0.5,
    y: PAGE_1_HEIGHT * 0.2,
    xScale: 150,
    yScale: 50,
    borderWidth: 15,
    colorRgb: CYAN,
    borderColorRgb: PURPLE,
  }),
);

// Here we (1) register the content stream to the PDF document, and (2) add the
// reference to the registered stream as the page's content stream.
page1.addContentStreams(pdfDoc.register(contentStream1));

/* =================== 4. Setup and Create Second Page ====================== */
// This step is platform independent. The same code can be used in any