I did solve it by paying close attention to the preload.js script, and making sure that there is a clear separation of concerns when making calls from the frontend to the backend. eventually, I resorted to calling the backend from React, and not use any printing call from the frontent.
The problem is that I'm also having problems with packaging right now. The latest electron version 16.0.5 is not supported by the node-printer, and after building it from source I still have problems with packaging (after packaging I get an error about the node-printer library not being found when opening the executable - the library, however is there). I eventually used Jetbrains Compose (abandoned electron), native Java printing APIs, and got what I wanted. Sorry I don't have anything more concrete to offer...
I have been having issues printing accented characters and special characters. I've tried encoding the string as UTF-8 and passing that as a buffer in printDirect. I've tried using character sets on the printer itself.
Here is a testing string I use
' character test << >> … ÀÁÂÏȊ äæéẽëěęḙḛéêèçöṻ c'est « test » & @ ‼︎ ⁈ '
I've got a Windows solution for all of you guys. Initially, I was trying to use a node printer to print PDF files, but I kept bumping into so many issues. Eventually, I realized that you can print PDFs from the command line using some programs, sumtra PDF and ghostscript + gsprint.
I packed it into an electron application and released it here Uk49s Results as I use it for my company
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example_zebra_printer.jsbe replaced with ZPL code?