neovim/lua/lsp/config/mason.lua

local status, mason = pcall(require, "mason")
if not status then
  return
end

local mason_lspconfig_status, mason_lspconfig = pcall(require, "mason-lspconfig")
if not mason_lspconfig_status then
  return
end

-- import mason-null-ls plugin safely
local mason_null_ls_status, mason_null_ls = pcall(require, "mason-null-ls")
if not mason_null_ls_status then
  return
end

mason.setup({
  ui = {
    icons = {
      package_installed = "✓",
      package_pending = "➜",
      package_uninstalled = "✗",
    },
  },
})

mason_lspconfig.setup({
  ensure_installed = {
    "tsserver",
    "volar",
    "html",
    "cssls",
    "tailwindcss",
    "lua_ls",
    "bashls",
    "jsonls",
  },
  automatic_installation = true,
})

mason_null_ls.setup({
  -- list of formatters & linters for mason to install
  ensure_installed = {
    "prettier", -- ts/js formatter
    "stylua",   -- lua formatter
    "eslint_d", -- ts/js linter
  },
  -- auto configured formatters & linters (with null-ls)
  automatic_installation = true,
})