return {
  'mfussenegger/nvim-lint',
  dependencies = { 'WhoIsSethDaniel/mason-tool-installer.nvim' },
  event = { 'BufReadPre', 'BufNewFile' },
  opts = {
    linters_by_ft = {
      python = { 'ruff', 'mypy' },
      go = { 'golangcilint' },
      yaml = { 'yamllint' },
      markdown = { 'markdownlint' },
      sh = { 'shellcheck' },
      lua = { 'luacheck' },
      sql = { 'sqlfluff' },
    },
    mason_to_lint = {
      golangcilint = { 'golangci-lint' },
    },
  },
  config = function(_, opts)
    local lint = require('lint')
    lint.linters_by_ft = opts.linters_by_ft

    -- Flatten linters and map to Mason package names
    local all_linters = {}
    for _, ft_linters in pairs(opts.linters_by_ft) do
      for _, l in ipairs(ft_linters) do
        local tool = opts.mason_to_lint[l] or { l }
        -- Handle both table and string values
        if type(tool) == 'table' then
          for _, t in ipairs(tool) do
            if t ~= '' then
              table.insert(all_linters, t)
            end
          end
        elseif tool ~= '' then
          table.insert(all_linters, tool)
        end
      end
    end

    -- Deduplicate tools
    local tools_set = {}
    for _, t in ipairs(all_linters) do
      tools_set[t] = true
    end
    local tools = vim.tbl_keys(tools_set)

    print('Ensuring installation of linters: ' .. table.concat(tools, ', '))

    -- Setup mason-tool-installer safely
    require('mason-tool-installer').setup({
      ensure_installed = tools,
      auto_update = false,
      run_on_start = true,
      start_delay = 3000,
    })

    -- Autocommand group for linting
    local augroup = vim.api.nvim_create_augroup('LintAutogroup', { clear = true })
    vim.api.nvim_create_autocmd({ 'BufEnter', 'BufWritePost', 'InsertLeave' }, {
      group = augroup,
      callback = function()
        local ft = vim.bo.filetype
        local available = lint.linters_by_ft[ft]
        if available and #available > 0 then
          local ok, err = pcall(lint.try_lint)
          if not ok then
            vim.notify('[nvim-lint] Error running linter: ' .. err, vim.log.levels.ERROR)
          end
        end
      end,
    })
  end,
}