return {
  "mrcjkb/rustaceanvim",
  version = "^4", -- Recommended
  ft = { "rust" },
  opts = {
    server = {
      on_attach = function(_, bufnr)
        vim.keymap.set("n", "<leader>cR", function()
          vim.cmd.RustLsp("codeAction")
        end, { desc = "Code Action", buffer = bufnr })
        vim.keymap.set("n", "<leader>dr", function()
          vim.cmd.RustLsp("debuggables")
        end, { desc = "Rust debuggables", buffer = bufnr })
      end,
      default_settings = {
        -- rust-analyzer language server configuration
        ["rust-analyzer"] = {
          cargo = {
            allFeatures = true,
            loadOutDirsFromCheck = true,
            runBuildScripts = true,
          },
          -- Add clippy lints for Rust.
          checkOnSave = {
            allFeatures = true,
            command = "clippy",
            extraArgs = { "--no-deps" },
          },
          procMacro = {
            enable = true,
            ignored = {
              ["async-trait"] = { "async_trait" },
              ["napi-derive"] = { "napi" },
              ["async-recursion"] = { "async_recursion" },
            },
          },
        },
      },
    },
  },
  config = function(_, opts)
    vim.g.rustaceanvim = vim.tbl_deep_extend("force", {}, opts or {})
  end,
}