simple file logger (NodeJS)

file-logger.js

const newFileLogger = (filename, init = false) => {
  if (init) fs.writeFileSync(filename, '', 'utf8'); // wipe/reset
  return (...lines) => {
    fs.appendFileSync(
      filename,
      lines
        .map(l => JSON.stringify(l, null, 2))
        .join('\n') + '\n',
      'utf8'
    )
  }
}

cont log = newFileLogger('~/log.txt', true);
...
log('Data:', [1, 2, 3, 99]);
...
log('Person:', {name: 'Bob', age: 7}, false, new Date());