Packaging error after adding dependencies for Angular Material

Type of Issue

Packaging error

[ x] Bug Report
[ ] Feature Request

Description

1. Using Angular CLI to create a new project.
2. Add a new module/component (e.g. navbar).
3. “ng-packagr -p ng-package.json” works fine.
4. Add Angular Material packages: npm install --save @angular/material @angular/cdk
5. Import a material module (e.g. MatToolbarModule) to the new module (navbar).
6. “ng-packagr -p ng-package.json” gives the following error

nav-component@0.0.0 packagr C:\work\GitRepos\nav-component ng-packagr -p ng-package.json

Building Angular library

BUILD ERROR ENOENT: no such file or directory, open ‘C:\work\GitRepos\nav-component\node_modules@angular\packages\material\esm5\form-field\error.js.map’ Error: ENOENT: no such file or directory, open ‘C:\work\GitRepos\nav-component\node_modules@angular\packages\material\esm5\form-field\error.js.map’

How To Reproduce

See the Description

Expected Behaviour

Packaging successfully

Version Information

ng-packagr: v1.4.1
node: v8.5.0
@angular: v4.2.4
rxjs: 5.4.2
zone.js: 0.8.14

please include any version information that might be relevant, e.g. other third-party libraries

[bjornalm]

Noticed that a solution to this and a discussion around it is found here: https://github.com/angular/material2/issues/7681#issuecomment-335482131

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