vega_lite

defmodule VegaLite.Utils do
  @moduledoc false

  @doc """
  Ensures `Jason` is available and raises an error otherwise.
  """
  def assert_jason!(fn_name) do
    unless Code.ensure_loaded?(Jason) do
      raise RuntimeError, """
      #{fn_name} depends on the :jason package.

      You can install it by adding

          {:jason, "~> 1.2"}

      to your dependency list.
      """
    end
  end

  @doc """
  Generates a string unique across processes and time.
  """
  @spec process_timestamp() :: binary()
  def process_timestamp() do
    "#{:erlang.phash2({node(), self()})}-#{System.os_time()}"
  end
end