async function main() {
    const doc = await PDFNet.PDFDoc.createFromURL(filename);
    const page = await doc.getPage(1);

    const writer = await PDFNet.ElementWriter.create();
    const reader = await PDFNet.ElementReader.create();
    reader.beginOnPage(page);
    writer.beginOnPage(page, PDFNet.ElementWriter.WriteMode.e_replacement, false);

    for (let element = await reader.next(); element !== null; element = await reader.next()) 
    {
        const elementType = await element.getType();
        switch (elementType) 
        {
            case PDFNet.Element.Type.e_image:
            case PDFNet.Element.Type.e_inline_image:
                // remove all images by skipping them
                break;
            default:
                writer.writeElement(element);
                break;
        }
    }

    writer.end();
    reader.end();
}
PDFNet.runWithCleanup(main);