The log level used by the console output.
The 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
%DATE% to set the date of the file within the string.
fileDatePattern to set the date format.
Should the logs be outputted in JSON format, for consumption by a collector.
The number of files to keep before the last file is rotated. If not set, no files are deleted.
Timestamp format used in the log output.
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Should the logs color-code the level strings in the output.