How to make ng build watching multiple apps?

I need to build 2 applications (New1 and New2) with watch option, so any files changes in any of those 2 apps lead to re-build.

ng build New1 && ng build New2 works fine, I can see both apps built under /dist directory, but I cannot get ng build --watch to work the same way. So far I tried:

1) ng build New1 && ng build New2 --watch Builds both apps, but then only watches New2. If I make changes to New1, the build doesn't happen again.

2) ng build New1 --watch && ng build New2 --watch Only builds New1 app and watches it.

3) ng build New1 --output-path dist/New1 && ng build New2 --output-path dist/New2 --watch Builds both apps, but then only watches New2.

4) ng build New1 --output-path dist/New1 --watch && ng build New2 --output-path dist/New2 --watch Only builds New1 app and watches it.

Is there a way to use build --watch for 2 apps in one line at all?

Appreciate the suggestions.

Angular CLI: 6.2.4
Node: 10.11.0
OS: win32 x64
Angular:
...

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.8.4
@angular-devkit/core         0.8.4
@angular-devkit/schematics   0.8.4
@schematics/angular          0.8.4
@schematics/update           0.8.4
rxjs                         6.2.2
typescript                   2.9.2

Solution

If you're trying to run 2 calls at the same time, I'd suggest the concurrently package:

https://www.npmjs.com/package/concurrently

It's pretty easy to combine calls. You would add a new script to package.json and combine 2 commands. Below has not been tested with your code so please read the docs:

"build:concurrent": "concurrently \"ng build New1 --watch\" \"ng build New2 --watch\"",

You would then run it in the terminal using npm run build:concurrent