ng serve: Data path "" should NOT have additional properties(extractCss).

[MindShelter]

Versions

Angular CLI: 7.0.6
Node: 10.1.0
OS: win32 x64
Angular: 7.0.4
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router, upgrade

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.10.6
@angular-devkit/build-angular     0.10.6
@angular-devkit/build-optimizer   0.10.6
@angular-devkit/build-webpack     0.10.6
@angular-devkit/core              7.0.6
@angular-devkit/schematics        7.0.6
@angular/cli                      7.0.6
@ngtools/webpack                  7.0.6
@schematics/angular               7.0.6
@schematics/update                0.10.6
rxjs                              6.3.3
typescript                        3.1.6
webpack                           4.19.1

Repro steps

1. Add "extractCss":true option in angular.cli -> projects.projectName.architect.serve.options
   The same error occurs if add the command in
   projects.projectName.architect.serve.configurations.production
2. Run ng serve

The log given by the failure

 Schema validation failed with the following errors:
 Data path "" should NOT have additional properties(extractCss). 

Desired functionality

Styles will be extracted and included into the project

Mention any other details that might be useful

I'm moving now to a hybrid angular/angularjs project and expect that my styles from components will be included in the project. Example of simple a component:

import template from './simple.html';
import controller from './simple.controller.js';
import './simple.less';

export const SimpleComponent = {
 template,
 controller
};

I will note that "extractCss":true option exists also in angular.cli -> projects.projectName.architect.build.configurations.production

[alan-agius4]

Duplicate of #10532

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