Method log

javascript/selenium-webdriver/lib/logging.js:353–366

* Logs a message at the given level. The message may be defined as a string * or as a function that will return the message. If a function is provided, * it will only be invoked if this logger's * plain #getEffectiveLevel() effective log level includes the given * `level`. *

(level, loggable)

   *     function that will return the message.
   */
  log(level, loggable) {
    if (!this.isLoggable(level)) {
      return
    }
    let message = '[' + this.name_ + '] ' + (typeof loggable === 'function' ? loggable() : loggable)
    let entry = new Entry(level, message, Date.now())
    for (let logger = this; logger; logger = logger.parent_) {
      if (logger.handlers_) {
        for (let handler of logger.handlers_) {
          handler(entry)
        }
      }
    }
  }

  /**
   * Logs a message at the {@link Level.SEVERE} log level.