Editora 0.11.0. Archived, so links from that release keep working. Read the 0.18.3 page →
Edit: Convert Indentation to Tabs
edit.indentationToTabs Rewrite the whole file’s leading indentation from spaces to tabs.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Edit: Convert Indentation to Tabs, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.