OptionalcolorizeOptionalconsoleThe log level used by the console output.
OptionalfileThe moment.js compatible date string to use when naming files.
An object mapping a file name to a logging level. The file will contain
all logs for that level inclusive up to the highest level. (info will contain warn, error etc)
Use %DATE% to set the date of the file within the string.
Use the fileDatePattern to set the date format.
OptionaljsonShould the logs be outputted in JSON format, for consumption by a collector.
OptionalmaxThe number of files to keep before the last file is rotated. If not set, no files are deleted.
OptionaltimestampTimestamp format used in the log output.
Should the logs color-code the level strings in the output.