code: function concat() {
      var observables = [];
      for (var _i = 0; _i < arguments.length; _i++) {
          observables[_i] = arguments[_i];
      }
      if (observables.length === 1 || (observables.length === 2 && Object(_util_isScheduler__WEBPACK_IMPORTED_MODULE_0__["isScheduler"])(observables[1]))) {
          return Object(_from__WEBPACK_IMPORTED_MODULE_2__["from"])(observables[0]);
      }
      return Object(_operators_concatAll__WEBPACK_IMPORTED_MODULE_3__["concatAll"])()(_of__WEBPACK_IMPORTED_MODULE_1__["of"].apply(void 0, observables));
  }
docs: PURE_IMPORTS_START _util_isScheduler,_of,_from,_operators_concatAll PURE_IMPORTS_END