Editora 0.10.0. Archived, so links from that release keep working. Read the 0.18.3 page →
LSP: Go to Type Definition
lsp.gotoTypeDefinition Jump to the declaration of the type of the symbol at the caret.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for LSP: Go to Type Definition, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.