code: function Logger () {
    const levels = [
      'fatal', // 1
      'error', // 2
      'warn', // 3
      'info', // 4
      'debug' // 5
    ];
    let verbosity = 3;
  
    levels.forEach((level, idx) => {
      this[level] = (...params) => {
        if (idx + 1 <= verbosity) console.log(...params); // eslint-disable-line
      };
    });
  
    this.setLevel = (_) => {
      verbosity = _;
    };
  
    return this;
  }
docs: Simple logger with levels.
  1 - fatal
  2 - error
  3 - warn
  4 - info
  5 - debug
  
  Logger level set globally with setLevel().
  Logging done using logger.<level>().