node.js - Log system for NodeJS Framework -

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i've created little pretty framework use when building nodejs web service i'm facing little problem hope you'll me resolve.

being java dev years, i'm used slf4j (http://www.slf4j.org/)

i can use interface define error/info/warning logs. users of frameworks can decide implementation want use , level of logs framework needed.

going node, have absolutely no idea how it.

is there way define logs , let framework users choose implementation , levels want logs?

you can use bunyan have log leveling, 

log.info log.error log.warning

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