This issue was originally filed by @seaneagan

Currently, we have Logger.onRecord, and you can do something simple like:

logger.onRecord.map((record) => formatRecord(record)).listen(print);

But there is no easy way to log to a file (issue #8686), a remote system (issue #8443), etc.

In Java's logback this is handled by Appenders:

http://logback.qos.ch/manual/appenders.html

Appenders in dart could implement one of the Sink interfaces, possibly StreamSink<String> ? Maybe instead call it LineSink ? LogSink ?

then could do something like:

logger.onRecord.pipe(new ConsoleLineSink());