Editora 0.10.0. Archived, so links from that release keep working. Read the 0.18.3 page →
View: Toggle PDF Line Numbers
view.togglePdfLineNumbers Include line numbers when exporting code to PDF.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for View: Toggle PDF Line Numbers, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.