invoice variables from pdf.pdfmake.js wont display

Hello! I love invoice ninja so far and im very thankfull to have it. It has solved many problems and it is just amazing. Although, I have a problem when creating or changing variables from the file pdf.pdfmake.js.
I run the gulp but I dont see any change at the invoice when I use the new or the modified variable. Is there any reason for that?

Hard to say… maybe you need to clear your browser cache?

I already tried that. For example i replaced 'invoiceNumber': invoice.is_statement ? '' : (invoice.invoice_number || ' ') with 'invoiceNumber': 12345 and nothing happened…

Sorry, I’m not sure