@spec put_options(vl :: VegaLite.t(), encoding :: atom(), options :: keyword()) ::
  VegaLite.t()

Sets an arbitrary set of options to the given encoding axis object.

Notice that no validation is performed, any option set will be merged with the existing axis options of the given encoding.

An ArgumentError is raised if the given encoding channel is not defined.

@spec set_title(vl :: VegaLite.t(), axis :: axis(), title :: binary()) :: VegaLite.t()

Set the title of the given axis.

@spec set_x_title(vl :: VegaLite.t(), title :: binary()) :: VegaLite.t()

Sets the x axis title.

@spec set_xy_titles(vl :: VegaLite.t(), x_title :: binary(), y_title :: binary()) ::
  VegaLite.t()

Sets the x-axis and y-axis titles at once.

@spec set_y_title(vl :: VegaLite.t(), title :: binary()) :: VegaLite.t()

Sets the y axis title.