code: function andObservables(observables) {
      return observables.pipe(Object(rxjs_operators__WEBPACK_IMPORTED_MODULE_3__["mergeAll"])(), Object(rxjs_operators__WEBPACK_IMPORTED_MODULE_3__["every"])(function (result) { return result === true; }));
  }
docs: ANDs Observables by merging all input observables, reducing to an Observable verifying all
  input Observables return `true`.