Angular2 Cannot find module 'angular2/core' but application works

Question

Given I have app written in Angular2 with app.component.ts and some imports in it:

import {Component} from 'angular2/core';

import {FiltersService} from "./services/filters-service";
import {SearchPipe} from "./pipes/header-pipe";
import {PaginationPipe} from "./pipes/pagination-pipe";


import {Header} from "./components/header/header.component";
import {Pagination} from "./components/pagination/pagination.component";
import {ConfigService} from "./services/config-service";
import {ResourceService} from "./services/resource-service";
import {HttpService} from "./services/http-service";

import 'rxjs/add/operator/map';
import {GlobalSearch} from "./components/global-search/global-search.component";
import {GlobalSearchPipe} from "./pipes/global-search-pipe";
import {CsvExport} from "./components/dropdown/csv-export.component";
import {HTTP_PROVIDERS} from "angular2/http";

When I start app by npm start , the app is starting and works properly, but in the console I am getting:

app/app.component.ts(1,25): error TS2307: Cannot find module 'angular2/core'.
app/app.component.ts(18,30): error TS2307: Cannot find module 'angular2/http'.

Answer 1

In fact, there are two parts here:

• The compilation part that relies on typings (d.ts files). If these files can't be found for the definition of objects / classes used, you will have compilation error. This won't stop the compilation process. See this question for more details: No compilation error without d.ts files .

• The runtime part that relies on JavaScript files. If corresponding files are included or available through the module manager, you will be able to use them.

In your case, I think that you can reach the core.d.ts file during compilation. When you configure your compiler with the value node for the moduleResolution property , it will (tsc) look for it within the node_modules folder.