return {
	  'Julian/lean.nvim',
	  event = { 'BufReadPre *.lean', 'BufNewFile *.lean' },

	  dependencies = {
	    'neovim/nvim-lspconfig',
	    'nvim-lua/plenary.nvim',

	    -- optional dependencies:

	    -- a completion engine
	    --    hrsh7th/nvim-cmp or Saghen/blink.cmp are popular choices

	    -- 'nvim-telescope/telescope.nvim', -- for 2 Lean-specific pickers
	    -- 'andymass/vim-matchup',          -- for enhanced % motion behavior
	    -- 'andrewradev/switch.vim',        -- for switch support
	    -- 'tomtom/tcomment_vim',           -- for commenting
	  },

	  ---@type lean.Config
	  opts = { -- see below for full configuration options
	    mappings = true,
	  }
}