Function $LogProvider

test/angular/1.7/angular.js:15460–15574

* @ngdoc provider * @name $logProvider * @this * * @description * Use the `$logProvider` to configure how the application logs messages

()

 * Use the `$logProvider` to configure how the application logs messages
 */
function $LogProvider() {
  var debug = true,
      self = this;

  /**
   * @ngdoc method
   * @name $logProvider#debugEnabled
   * @description
   * @param {boolean=} flag enable or disable debug level messages
   * @returns {*} current value if used as getter or itself (chaining) if used as setter
   */
  this.debugEnabled = function(flag) {
    if (isDefined(flag)) {
      debug = flag;
      return this;
    } else {
      return debug;
    }
  };

  this.$get = ['$window', function($window) {
    // Support: IE 9-11, Edge 12-14+
    // IE/Edge display errors in such a way that it requires the user to click in 4 places
    // to see the stack trace. There is no way to feature-detect it so there's a chance
    // of the user agent sniffing to go wrong but since it's only about logging, this shouldn't
    // break apps. Other browsers display errors in a sensible way and some of them map stack
    // traces along source maps if available so it makes sense to let browsers display it
    // as they want.
    var formatStackTrace = msie || /\bEdge\//.test($window.navigator && $window.navigator.userAgent);

    return {
      /**
       * @ngdoc method
       * @name $log#log
       *
       * @description
       * Write a log message
       */
      log: consoleLog('log'),

      /**
       * @ngdoc method
       * @name $log#info
       *
       * @description
       * Write an information message
       */
      info: consoleLog('info'),

      /**
       * @ngdoc method
       * @name $log#warn
       *
       * @description
       * Write a warning message
       */
      warn: consoleLog('warn'),