Taking the following scripts section from a package.json:
\"scripts\":{
\"sass:watch\": \"npm run sass -- -w ./src/public/stylesheets -r --s
AFAIK, you can't, in a useful way.
You could push one task to the background by appending & to its command line, but that would keep the task running even when you ^C to stop the running NPM task.
Alternatively, you can call npm run ... twice and bg one:
$ npm run sass:watch &
$ npm run livereload
But that's pretty messy too IMO.
If you want this sort of thing, consider using gulp.