nvim/lua/plugins/lint.lua

return {
  'mfussenegger/nvim-lint',
  event = { 'BufReadPre', 'BufNewFile' },
  config = function()
    local lint = require 'lint'
    lint.linters_by_ft = {
      make = { 'checkmake' },
      javascript = { 'eslint_d' },
      javascriptreact = { 'eslint_d' },
      typescript = { 'eslint_d' },
      typescriptreact = { 'eslint_d' },
    }

    -- Configure eslint_d to use current working directory as root
    lint.linters.eslint_d.cwd = function()
      return vim.fn.getcwd()
    end

    -- Create autocommand which carries out the actual linting
    -- on the specified events.
    local lint_augroup = vim.api.nvim_create_augroup('lint', { clear = true })
    vim.api.nvim_create_autocmd({ 'BufEnter', 'BufWritePost', 'InsertLeave' }, {
      group = lint_augroup,
      callback = function()
        -- Only run the linter in buffers that you can modify in order to
        -- avoid superfluous noise, notably within the handy LSP pop-ups that
        -- describe the hovered symbol using Markdown.
        if vim.bo.modifiable then lint.try_lint(nil, { ignore_errors = true }) end
      end,
    })
  end,
}