'rootDir' is expected to contain all source files

Question

I have an Angular CLI workspace containing two library projects, foo and bar. When I build the second of the two libraries, foo, the build fails with the following error:

error TS6059: File '/code/projects/bar/src/lib/types.ts' is not under 'rootDir' '/code/projects/foo/src'. 'rootDir' is expected tocontain all source files.

Error: error TS6059: File '/code/projects/bar/src/lib/types.ts' is not under 'rootDir' '/code/projects/foo/src'. 'rootDir' is expected to contain all source files.

    at Object.<anonymous> (/code/node_modules/ng-packagr/lib/ngc/compile-source-files.js:53:68)
    at Generator.next (<anonymous>)
    at /code/node_modules/ng-packagr/lib/ngc/compile-source-files.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/code/node_modules/ng-packagr/lib/ngc/compile-source-files.js:3:12)
    at Object.compileSourceFiles (/code/node_modules/ng-packagr/lib/ngc/compile-source-files.js:19:12)
    at Object.<anonymous> (/code/node_modules/ng-packagr/lib/ng-v5/entry-point/ts/compile-ngc.transform.js:26:32)
    at Generator.next (<anonymous>)
    at /code/node_modules/ng-packagr/lib/ng-v5/entry-point/ts/compile-ngc.transform.js:7:71
    at new Promise (<anonymous>)

I have reproduced the error in a sandbox repo on GitHub here. I have simplified the code to as much as I can while still experiencing the error. You can reproduce the error by executing npm run build on the rootDir-expect-all-source-files-error branch. What is the cause of the error? May this be a bug with ng-packagr or ngc or tsc? Or is it simply a configuration issue?

Observations

Below are code changes with which I can make the build pass, but I would like to know what is causing the error with the code as is.

bar.component.ts

Build fails

export class BarComponent {

  list = this.barService.list();

  constructor(private barService: BarService) {}
}

Build passes

Initialize list property in constructor instead of inline

export class BarComponent {

  list;

  constructor(private barService: BarService) {
    this.list = this.barService.list();
  }
}

bar.service.ts

Build fails

import { Injectable } from '@angular/core';
import { List, Item } from './types';

@Injectable({
  providedIn: 'root'
})
export class BarService {

  private _list: List = [];

  constructor() { }

  add(item: Item): void {
    this._list.push(item);
  }

  list(): List {
    return this._list;
  }
}

Build passes

Remove the data types

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class BarService {

  private _list: any[] = [];

  constructor() { }

  add(item: any): void {
    this._list.push(item);
  }

  list(): any {
    return this._list;
  }
}

Answer 1

I had the same issue, but the solution of @Agius did not help.

I had:

Angular Workspace
  - projects
      - lib1
      - lib2
  - src
      - test application

In fact I had moved a component from lib2 to lib1, by dragging the folder in WebStorm. By doing this, the references in lib2 to that component were not removed but updated and pointed to the source-folder of lib1. I forgot to remove these references which were no longer needed in lib2. After removing all references to the component in lib2, that library compiled.

I had to remove the references in

• public_api.ts
• ./lib/lib2.module.ts

Maybe there are more references in your project.