Editora 0.18.3. Archived, so links from that release keep working. Read the 0.18.5 page →
npm: Run Custom Task(s)…
npm.runCustom Prompt for a freeform npm task/argument string and run it.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for npm: Run Custom Task(s)…, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.