Angular & TypeScript: Class instance check doesn't work -


i'm trying check type of error being returned web service. problem instanceof check doesn't work. none of if work.

component class method triggers call ws:

public performsearch(keyword: string) {     this.searchservice.searchwithquery(keyword)       .subscribe(         response => {           this.searchresults = json.parse(response._body);         },         (error: apperror) => {           console.log('error instance');           console.log(error);           if (error instanceof notfounderror) {             this.snackbar.open('404 not found', 'x', {               duration: 5000,             });           }           if (error instanceof accessdeniederror) {             this.snackbar.open('401 access denied', 'x', {               duration: 5000,             });           }           if (error instanceof badinputerror) {             this.snackbar.open('400 bad input', 'x', {               duration: 5000,             });           }           if (error instanceof apperror) {             this.snackbar.open('general error', 'x', {               duration: 5000,             });           }         });   }

search.data.service class extending base service class:

searchwithquery(query: string) {     let headers = new headers();     headers.append('authorization', 'bearer ' + this.tokenvalue);     return this.http.get(this.gatewayurl + this.servicename + this.withquery + query, {       headers: headers     })       .catch(this.handleerror);   }    private handleerror(error: response): errorobservable {     if (error.status === 404)       return observable.throw(new notfounderror(error.json()));     if (error.status === 400)       return observable.throw(new badinputerror(error.json()));     if (error.status === 401) {       return observable.throw(new accessdeniederror(error.json()));     }      return observable.throw(new apperror(error.json()));   }

apperror.ts class

export class apperror {   constructor(public originalerror?: any) {   } }

and rest of error classes extend it, f.e.:

export class accessdeniederror extends apperror { }

when trying log error of apperror in console odd:

typeerror: __webpack_imported_module_2_rxjs_observable__.observable.throw not function     @ catchsubscriber.webpackjsonp.../../../../../src/app/common/services/search.data.service.ts.searchdataservice.handleerror [as selector] (search.data.service.ts:52)     @ catchsubscriber.webpackjsonp.../../../../rxjs/operator/catch.js.catchsubscriber.error (catch.js:104)     @ xmlhttprequest.onload (http.es5.js:1231)     @ zonedelegate.webpackjsonp.../../../../zone.js/dist/zone.js.zonedelegate.invoketask (zone.js:424)     @ object.oninvoketask (core.es5.js:3881)     @ zonedelegate.webpackjsonp.../../../../zone.js/dist/zone.js.zonedelegate.invoketask (zone.js:423)     @ zone.webpackjsonp.../../../../zone.js/dist/zone.js.zone.runtask (zone.js:191)     @ zonetask.webpackjsonp.../../../../zone.js/dist/zone.js.zonetask.invoketask [as invoke] (zone.js:498)     @ invoketask (zone.js:1370)     @ xmlhttprequest.globalzoneawarecallback (zone.js:1388)

as error message says, error none of above typeerror, , caused fact there's no observable.throw method.

unless entire rxjs package imported import 'rxjs/rx', throw should imported explicitly, other rxjs operator or observable method:

import 'rxjs/add/observable/throw';

this kind of errors supposed detected during typescript compilation, there no need debug them @ runtime.


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