Function logFetchMetric

packages/next/src/server/dev/log-requests.ts:148–198

(
  fetchMetric: FetchMetric,
  loggingConfig: LoggingConfig | undefined
)

}

function logFetchMetric(
  fetchMetric: FetchMetric,
  loggingConfig: LoggingConfig | undefined
): void {
  let {
    cacheReason,
    cacheStatus,
    cacheWarning,
    end,
    method,
    start,
    status,
    url,
  } = fetchMetric

  if (cacheStatus === 'hmr' && !loggingConfig?.fetches?.hmrRefreshes) {
    // Cache hits during HMR refreshes are intentionally not logged, unless
    // explicitly enabled in the logging config.
    return
  }

  if (loggingConfig?.fetches) {
    if (url.length > 48 && !loggingConfig.fetches.fullUrl) {
      url = truncateUrl(url)
    }

    writeLine(
      white(
        `${method} ${url} ${status} in ${Math.round(end - start)}ms ${formatCacheStatus(cacheStatus)}`
      ),
      1
    )

    if (cacheStatus === 'skip' || cacheStatus === 'miss') {
      writeLine(
        gray(
          `Cache ${cacheStatus === 'skip' ? 'skipped' : 'missed'} reason: (${white(cacheReason)})`
        ),
        2
      )
    }
  } else if (cacheWarning) {
    // When logging for fetches is not enabled, we still want to print any
    // associated warnings, so we print the request first to provide context.
    writeLine(white(`${method} ${url}`), 1)
  }

  if (cacheWarning) {
    writeLine(`${yellow(bold('⚠'))} ${white(cacheWarning)}`, 2)
  }
}

function writeLine(text: string, indentationLevel = 0): void {
  process.stdout.write(` ${'│ '.repeat(indentationLevel)}${text}\n`)