return {
  -- LSP installer
  { "williamboman/mason.nvim", config = true },
  { "williamboman/mason-lspconfig.nvim", config = true },

  -- LSP configuration
  {
    "neovim/nvim-lspconfig",
    config = function()
      -- Initialize Mason
      require("mason").setup()
      require("mason-lspconfig").setup()

      -- Lua for vim
      vim.lsp.config("lua_ls", {
        settings = {
          Lua = {
            diagnostics = {
              globals = { "vim" }, -- recognize 'vim' as a global
            },
            workspace = {
              library = vim.api.nvim_get_runtime_file("", true), -- includes Neovim runtime files
              checkThirdParty = false, -- optional, avoids prompts about unknown libraries
            },
            telemetry = { enable = false }, -- optional, disable telemetry
          },
        },
      })
      vim.lsp.enable("lua_ls")

      -- C/C++
      vim.lsp.config("clangd", {})
      vim.lsp.enable("clangd")

      -- Rust
      vim.lsp.config("rust_analyzer", {})
      vim.lsp.enable("rust_analyzer")

      -- Auto format
      vim.api.nvim_create_autocmd("BufWritePre", {
        pattern = "*.rs",
        callback = function()
          vim.lsp.buf.format({ async = false })
        end,
      })

      -- Floating diagnostic on hover
      vim.api.nvim_create_autocmd("CursorHold", {
        callback = function()
          vim.diagnostic.open_float(nil, { focusable = false })
        end,
      })

      -- Enable virtual text and signs
      vim.diagnostic.config({
        virtual_text = false,
        signs = true,
        underline = true,
        update_in_insert = false,
        severity_sort = true,
      })


      -- Optional: add keymaps
      local keymap = vim.keymap
      keymap.set("n", "gd", vim.lsp.buf.definition, { desc = "Go to definition" })
      keymap.set("n", "K", vim.lsp.buf.hover, { desc = "Hover documentation" })
      keymap.set("n", "gr", vim.lsp.buf.references, { desc = "References" })
    end,
  },

  -- Completion
  {
    "hrsh7th/nvim-cmp",
    dependencies = {
      "hrsh7th/cmp-nvim-lsp",
      "L3MON4D3/LuaSnip",
    },
    config = function()
      local cmp = require("cmp")
      cmp.setup({
        snippet = {
          expand = function(args)
            require("luasnip").lsp_expand(args.body)
          end,
        },
        mapping = cmp.mapping.preset.insert({
          ["<C-n>"] = cmp.mapping.select_next_item(),
          ["<C-p>"] = cmp.mapping.select_prev_item(),
          ["<CR>"] = cmp.mapping.confirm({ select = true }),
        }),
        sources = cmp.config.sources({
          { name = "nvim_lsp" },
          { name = "buffer" },
        }),
      })
    end,
  },
  {
    "hrsh7th/nvim-cmp",
    dependencies = { "hrsh7th/cmp-nvim-lsp", "L3MON4D3/LuaSnip" },
    config = function()
      local cmp = require("cmp")
      cmp.setup({
        snippet = {
          expand = function(args)
            require("luasnip").lsp_expand(args.body)
          end,
        },
        mapping = cmp.mapping.preset.insert({
          ["<C-n>"] = cmp.mapping.select_next_item(),
          ["<C-p>"] = cmp.mapping.select_prev_item(),
          ["<CR>"] = cmp.mapping.confirm({ select = true }),
        }),
        sources = cmp.config.sources({
          { name = "nvim_lsp" },
          { name = "buffer" },
        }),
      })
    end,
  },
}