Angular.json ability to define shared app build configuration

[mcm-ham]

Bug Report or Feature Request (mark with an x)

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

Area

- [x] devkit
- [ ] schematics

Desired functionality

I have a number of sub-projects that I would like the same build configuration apart from paths. In angular.json it would be helpful to have the ability to setup default build configurations that can apply to all projects (or ability for one app to refer to another apps build config).

[dominikg]

maybe an option for a js/ts config file with import/export would work well?

I imagine an angular.json file of a workspace with some apps/libraries can get quite verbose right now.
If you could break it down into something along the lines of

import appConfig from 'projects/app/angular-app-config';

export const config = {
...
  projects: {
    app: appConfig
  }
};

and in angular-app-config

import defaultConfig from '@angular/cli/config/app/default';
const appConfig = defaultConfig;
appConfig.foo = 'bar';
export default appConfig;

[MickL]

Duplicate of: #11233
Also there is: #10612

[kyliau]

This has already been and addressed and fixed in #10612

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