How to use streamroller - 3 common examples

function appender(
  filename,
  pattern,
  layout,
  options,
  timezoneOffset
) {
  // the options for file appender use maxLogSize, but the docs say any file appender
  // options should work for dateFile as well.
  options.maxSize = options.maxLogSize;

  const logFile = new streams.DateRollingFileStream(
    filename,
    pattern,
    options
  );

  logFile.on("drain", () => {
    process.emit("log4js:pause", false);
  });

  const app = function (logEvent) {
    if (!logFile.write(layout(logEvent, timezoneOffset) + eol, "utf8")) {
      process.emit("log4js:pause", true);
    }
  };

  app.shutdown = function (complete) {

function openTheStream(file, fileSize, numFiles, options) {
  const stream = new streams.RollingFileStream(
    file,
    fileSize,
    numFiles,
    options
  );
  stream.on('error', (err) => {
    console.error('log4js.fileAppender - Writing to file %s, error happened ', file, err); //eslint-disable-line
  });
  stream.on('drain', () => {
    process.emit("log4js:pause", false);
  });
  return stream;
}

function openTheStream(file, fileSize, numFiles, options) {
  const stream = new streams.RollingFileStream(
    file,
    fileSize,
    numFiles,
    options
  );
  stream.on('error', (err) => {
    console.error('log4js.fileAppender - Writing to file %s, error happened ', file, err); //eslint-disable-line
  });
  return stream;
}