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Maurice
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Every log line ran existsSync, statSync and appendFileSync on the event loop before it returned. On a slow data volume (an SMB or NFS bind mount on a NAS) that stalled every request that logged, and rotation renamed files without checking whether another process sharing data/logs had rotated already. The file half of the logger is now BufferedLogFile: a line is queued in memory and the queue goes out with one appendFile per batch, through a single serial chain, so no append runs while files are being renamed. The files and the rotation are the same as before (trek.log rotates to .1 at 10 MB, five files in total), but the size is re-read before a rotation and a file another process already rotated is left alone. A stalled disk costs dropped lines with a count instead of unbounded memory, a failed write is reported instead of thrown, and index.ts writes whatever is still queued synchronously when the process exits.