simple persistent_term storage

storage.ex

defmodule Storage do
  @moduledoc """
  This module provides a wrapper around the :persistent_term module

  https://www.erlang.org/doc/man/persistent_term
  """

  @type storage :: atom()
  @type key :: atom()
  @type value :: any()

  @spec get(storage(), key()) :: value()
  def get(storage \\ __MODULE__, key) when is_atom(key) do
    :persistent_term.get({storage, key}, nil)
  end

  @spec put(storage(), key(), value()) :: :ok
  def put(storage \\ __MODULE__, key, value) when is_atom(key) do
    :persistent_term.put({storage, key}, value)
  end
end