Reference

All functions
logger.debug()	Prints a debug message.
logger.error()	Prints an error message.
logger.getLevel()	Get configured logging level.
logger.info()	Prints an informational message.
logger.message()	Prints a message at a certain log level.
logger.setLevel()	Configure logging level.
logger.setOutputFile()	Configure logging output filename.
logger.setQuitOnSevere()	Configure whether severe should quit.
logger.setUseConsole()	Configure logging to console.
logger.setWidth()	Configure the number of chars per line
logger.severe()	Prints an severe message and stops execution.
logger.warn()	Prints a warning message.
print2string()	Convert the printed output of an object to a string. This is particularly useful for passing complex objects (e.g. matrices, data.frames) to simple printing functions like logger.info() or base::message().
severeifnot() errorifnot() warnifnot() infoifnot() debugifnot()	Logger message if conditions are not met