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You can add an image watermark over text in a PDF file using jsPDF by following these steps:

1. Load the image using the addImage method:

var image = new Image();
image.src = 'watermark.png';

1. Create a PDF using the jsPDF constructor:

var pdf = new jsPDF();

1. Add text to the PDF using the text method:

pdf.text(20, 20, 'Example Text');

1. Add the image watermark using the addImage method:

pdf.addImage(image, 'png', 0, 0, pdf.internal.pageSize.width, pdf.internal.pageSize.height);

1. Save the PDF using the save method:

pdf.save('example.pdf');

This will create a PDF file with the specified text and an image watermark covering it.