ng-packagr works fine but with warnings!

Type of Issue

[ ] Bug Report
[ ] Feature Request
[x] Others

Description

When we run ng-packagr we get warning from node. Is that a bug or do we something wrong?

ng-package.json

{
  "$schema": "./node_modules/ng-packagr/package.schema.json",
  "dest": "./",
  "deleteDestPath": false,
  "whitelistedNonPeerDependencies": ["."],
  "keepLifecycleScripts": true,
  "lib": {
    "entryFile": "./public_api.ts",
    "languageLevel": ["dom", "es2017"]
  }
}

Output:

> ng-packagr

Building Angular Package
Building entry point '@honey.glass/matmedia'
Cleaning build directory
Rendering Stylesheets
Rendering Templates
Compiling TypeScript sources through ngc
Bundling to FESM15
Bundling to FESM5
Bundling to UMD
Minifying UMD bundle
Relocating source maps
Copying staged files
Writing package metadata
You enabled keepLifecycleScripts explicitly. The scripts section in package.json will be published to npm.
Creating package .tgz
Built foo/matmedia
Built Angular Package!
- from: packages/matmedia
- to:   packages/matmedia

(node:75096) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: ENOENT: no such file or directory, chmod '.ng_pkg_build/honey.glass-matmedia/out/node_modules/injection-js/metadata.d.ts'
(node:75096) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

on each run (ng-packagr) there are different warnings

(node:75725) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: ENOENT: no such file or directory, open '.ng_pkg_build/honey.glass-matmedia/out/node_modules/rxjs/operator/windowCount.d.ts'
(node:75725) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Version Information

$ node_modules/.bin/ng-packagr --version
ng-packagr: 2.4.1
@angular/compiler: 5.2.9
@angular/compiler-cli: 5.2.9
rollup: 0.55.5
tsickle: 0.27.2
typescript: 2.5.3

[igabesz]

Yep, same error here. I got this for <project>\.ng_pkg_build\duelbox-jigs\out\node_modules\reflect-metadata\Reflect.d.ts'. Then I added import 'reflect-metadata'; to the entry file which solved the error. Now I’m wrestling with RxJs imports… Will report back if something found.

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