emqx4.3/apps/emqx/include/types.hrl

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-type option(T) :: undefined | T.

-type startlink_ret() :: {ok, pid()} | ignore | {error, term()}.

-type ok_or_error(Reason) :: ok | {error, Reason}.

-type ok_or_error(Value, Reason) :: {ok, Value} | {error, Reason}.

-type mfargs() :: {module(), atom(), [term()]}.