Copy tasks with Stenciljs

Hi !
I’m new in Stencil.js development and I want to know how to watch copy tasks ?
Actually, when I run npm start, my .tsx and .scss is good build in www folder but I need to copy some files in another folder and for that, I must stop and re-run npm start to rebuild my application.

So how to watch copy tasks ?

thx :slight_smile: