@type t() ::
  binary()
  | :doc_line
  | :doc_nil
  | doc_break()
  | doc_collapse()
  | doc_color()
  | doc_cons()
  | doc_fits()
  | doc_force()
  | doc_group()
  | doc_nest()
  | doc_string()

(This type is managed by TypeCheck, which allows checking values against the type at runtime.)

Full definition:

t() :: binary()
| :doc_line
| :doc_nil
| doc_break()
| doc_collapse()
| doc_color()
| doc_cons()
| doc_fits()
| doc_force()
| doc_group()
| doc_nest()
| doc_string()