mathjs/es/utils/log.js

/**
 * Log a console.warn message only once
 */
export var warnOnce = function () {
  var messages = {};
  return function warnOnce() {
    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    var message = args.join(', ');

    if (!messages[message]) {
      var _console;

      messages[message] = true;

      (_console = console).warn.apply(_console, ['Warning:'].concat(args));
    }
  };
}();