Watch mode inside build creates an infinite build

[poi33]

Following the tsup starter guide/tutorial running is done with enonic dev

This starts a new gradle build creates a build that incorporates npm watch.
(The build also takes a really long time to downloud all npm packages and node.js)

This gives a bad experience since it will look like the build never finishes.

Can we seperate the commands of watching and building?
First build (let it finish)
Second run npm watch or gradlew watch (if gradle task is needed)

This will probably affect the https://github.com/enonic/cli-enonic enonic and will require changes in that repo too.