I'm glad to see useful features like easily adding userId and sessionId to logs. That said, I wish it wasn't limited to just these properties. From my experience building enterprise SaaS, you need more metadata for proper filtering: tenantId, operation, and others. With Winston, I typically create child logger instances and pass them around to ensure all logs contain the right metadata, but that workflow is pretty annoying.
Quick question out of curiosity: why does the example include an API key when initializing the logger? I couldn't find an explanation on the GitHub page. Some people might be put off seeing that in the first example, thinking the logger requires a paid subscription.