Logging In Loop (ARCH3164)

Key typescript.logging.logging-in-loop · Severity info · Category logging

Log statements inside a loop body can flood log sinks over large collections. This raises storage cost and buries real events in noise.

Incorrect

function importRows(rows: Row[]) {
  for (const row of rows) {
    logger.info("processing row", { id: row.id });
    process(row);
  }
}

Correct

function importRows(rows: Row[]) {
  for (const row of rows) {
    process(row);
  }
  logger.info("rows processed", { count: rows.length });
}

Fix

Aggregate results and write a single summary log outside the loop instead of logging per iteration.