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'.

Community · Accepted Answer · 2017-05-23 12:32:32Z

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.

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