ng serve doesn't work with linked module

Bug Report or Feature Request (mark with an x)

- [x] bug report
- [ ] feature request

Versions.

@angular/cli: 1.2.6 node: 6.11.1 os: win32 x64 @angular/animations: 4.3.3 @angular/common: 4.3.3 @angular/compiler: 4.3.3 @angular/core: 4.3.3 @angular/forms: 4.3.3 @angular/http: 4.3.3 @angular/platform-browser: 4.3.3 @angular/platform-browser-dynamic: 4.3.3 @angular/router: 4.3.3 @angular/cli: 1.2.6 @angular/compiler-cli: 4.3.3 @angular/language-service: 4.3.3

Repro steps.

Create a node module locally and link it with npm link. Go to your project generated with @angular/cli and link this module: npm link ngx-my-module. Use your module in your project. For instance:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { MyModule } from 'ngx-my-module';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AnalyticsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Then run ng serve

The log given by the failure.

λ ng serve
Cannot read property 'length' of undefined
TypeError: Cannot read property 'length' of undefined
    at createSourceFile (my-module\node_modules\typescript\lib\typescript.js:15457:109)
    at parseSourceFileWorker (my-module\node_modules\typescript\lib\typescript.js:15389:26)
    at Object.parseSourceFile (my-module\node_modules\typescript\lib\typescript.js:15338:26)
    at Object.createSourceFile (my-module\node_modules\typescript\lib\typescript.js:15192:29)
    at WebpackCompilerHost.getSourceFile (my-module\node_modules\@ngtools\webpack\src\compiler_host.js:239:27)
    at findSourceFile (my-module\node_modules\typescript\lib\typescript.js:67909:29)
    at processSourceFile (my-module\node_modules\typescript\lib\typescript.js:67840:27)
    at my-module\node_modules\typescript\lib\typescript.js:67950:17
    at Object.forEach (my-module\node_modules\typescript\lib\typescript.js:1449:30)
    at processReferencedFiles (my-module\node_modules\typescript\lib\typescript.js:67948:16)
    at findSourceFile (my-module\node_modules\typescript\lib\typescript.js:67933:21)
    at processImportedModules (my-module\node_modules\typescript\lib\typescript.js:68056:25)
    at findSourceFile (my-module\node_modules\typescript\lib\typescript.js:67937:17)
    at processImportedModules (my-module\node_modules\typescript\lib\typescript.js:68056:25)
    at findSourceFile (my-module\node_modules\typescript\lib\typescript.js:67937:17)
    at processImportedModules (my-module\node_modules\typescript\lib\typescript.js:68056:25)

Mention any other details that might be useful.

I used generator-ngx-library to generate my node module project. It uses @angular/cli in a demo app.

[hieuxlu]

This have been discussed many times as in https://github.com/angular/angular-cli/issues/6228#issuecomment-301024884. I believe the correct way to do this is to use tsconfig.json paths property, instead of linking it as a module. You can see paths it in @angular/cli tsconfig.json as well.

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