return {
  {
    'nvim-treesitter/nvim-treesitter',
    branch = 'main',
    lazy = false,
    build = ':TSUpdate',
    config = function(_, opts)
      -- enable indent
      vim.api.nvim_create_autocmd('FileType', {
        callback = function()
          pcall(vim.treesitter.start)
          vim.bo.indentexpr = [[v:lua.require'nvim-treesitter'.indentexpr()]]
        end,
      })
      -- auto-install
      local already_installed = require('nvim-treesitter').get_installed()
      local parsers_installable = vim
        .iter(opts.ensure_installed)
        :filter(function(parser)
          return not vim.tbl_contains(already_installed, parser)
        end)
        :totable()
      require('nvim-treesitter').install(parsers_installable)
    end,
    opts = {
      ensure_installed = {
        'bash',
        'c',
        'cmake',
        'comment',
        'cpp',
        'css',
        'dockerfile',
        'go',
        'gomod',
        'gotmpl',
        'gowork',
        'html',
        'javascript',
        'json',
        'lua',
        'make',
        'markdown',
        'markdown_inline',
        'ninja',
        'python',
        'regex',
        'rust',
        'scss',
        'sql',
        'todotxt',
        'toml',
        'typescript',
        'typst',
        'vim',
        'vimdoc',
        'yaml',
        'zig',
      },
    },
  },
}