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I have searched for a long time but nothing helps. I have two files header.php and other.php.

My header.php it looks like this:

..... </head> <header> ..... <script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.0.0/jspdf.umd.min.js"></script> </header>

I require the header.php in other.php and want to use jsPDF in this file:

require "header.php";
</body>
<script>
    function createInvoice(final){
      const doc = new jsPDF();
      doc.text("Hello world!", 10, 10);
      doc.save("a4.pdf");
</script>
I tried with the script to include jsPDF in the body tag, in the head tag and over the script tag with the function, but every time I am getting the following error :
Uncaught ReferenceError: jsPDF is not defined
Can someone help me?
Thank you in advance
In the new release, they changed the name of the global variable -> const { jsPDF } = window.jspdf.
<script>
    window.jsPDF = window.jspdf.jsPDF; // add this line of code
    function createInvoice(final){
        const doc = new jsPDF();
        doc.text("Hello world!", 10, 10);
        doc.save("a4.pdf");
</script>
        
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