vim/lua/custom/plugins/formatter.lua

return {
  "mhartington/formatter.nvim",
  lazy = false,
  init = function()
    vim.api.nvim_create_augroup('_formatter', { clear = true });
    vim.api.nvim_create_autocmd('BufWritePost', {
      command = 'FormatWrite',
      group = '_formatter',
    })
  end,
  opts = function()
   local filetypes = require('formatter.filetypes')
    return {
      logging = false,
      log_level = vim.log.levels.WARN,
      filetype = {
        lua = {
          filetypes.lua.stylua,
        },
        javascript = {
          filetypes.javascript.eslint_d,
        },
        javascriptreact = {
          filetypes.javascript.eslint_d,
        },
        json = {
          filetypes.json.prettierd,
        },
        rust = {
          filetypes.rust.rustfmt,
        },
            ['*'] = {
          filetypes.any.remove_trailing_whitespace,
        },
      },
    }
  end
}