emqx4.3/include/types.hrl

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-type(maybe(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}).