Building an application automatically watch for libraries changes

[azephiris]

🚀 Feature request

Command (mark with an x)

• build
• serve

Description

Whe working in an Angular workspace,
you have to run ng build [lib] --watch on all libraries and then ng build [app] --watch
to detect the changes and rebuild the application with the latest libraries changes.

Describe the solution you'd like

• A flag (--watchLibraries=opts?) to automatically build & watch libraries when running ng build [app] --watch
or
• An option in angular.json to make it dependent on the configuration.

opts=true|false|noFirstBuild:
true/false: activate / deactivate the functionnality.
noFirstBuild: to prevent having to compile lots of libraries each time you run the command, you can choose to only build them if they changed after the application has been built.

How to detect the libraries:
Using angular.json#projects.[project].projectType (= library)

Describe alternatives you've considered

npm scripts, but each time you add a library you need to add it in the scripts.

[alan-agius4]

Duplicate of #11002

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