Angular 10 optimization warnings

[michael faith]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request
- [ ] question

OS and Version?

Windows 10

Versions

Angular CLI: 10.0.1
Node: 12.13.0
OS: win32 x64

Angular: 10.0.2
... animations, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router
Ivy Workspace: Yes

Package Version

@angular-devkit/architect 0.1000.1
@angular-devkit/build-angular 0.1000.1
@angular-devkit/build-ng-packagr 0.1000.1
@angular-devkit/build-optimizer 0.1000.1
@angular-devkit/build-webpack 0.1000.1
@angular-devkit/core 10.0.1
@angular-devkit/schematics 10.0.1
@angular/cdk 10.0.1
@angular/cli 10.0.1
@angular/flex-layout 10.0.0-beta.32
@angular/material 10.0.1
@ngtools/webpack 10.0.1
@schematics/angular 10.0.1
@schematics/update 0.1000.1
ng-packagr 10.0.0
rxjs 6.5.5
typescript 3.9.5
webpack 4.43.0

Repro steps

ng build when library is included.

The log given by the failure

Start of build warning:

Warning: Entry point 'ngx-highlightjs' contains deep imports into 'C:/Users/<username>/src/fabric/ui/node_modules/highlight.js/lib/highlight'. This is probably not a problem, but may cause the compilation of entry points to be out of order.

Post-build warnings:

WARNING in C:\Users\<username>\src\fabric\ui\node_modules\ngx-highlightjs\fesm2015\ngx-highlightjs.js depends on 'highlight.js'. CommonJS or AMD dependencies can cause optimization bailouts.
For more info see: https://angular.io/guide/build#configuring-commonjs-dependencies

WARNING in C:\Users\<username>\src\fabric\ui\node_modules\ngx-highlightjs\fesm2015\ngx-highlightjs.js depends on 'highlight.js/lib/highlight'. CommonJS or AMD dependencies can cause optimization bailouts.
For more info see: https://angular.io/guide/build#configuring-commonjs-dependencies

Desired functionality

Not sure if this is actually causing an issue, but I'm seeing these in my logs every ng build. Seems like the cli isn't liking the way the dependency is referenced.

[Murhaf Sousli]

In Angular 10, add the following to avoid the warning

{
  "projects": {
    "project-name": {
      "architect": {
        "build": {
          "allowedCommonJsDependencies": [
            "highlight.js"
          ]
        }
      }
    }
  }
}