I have seen unanswered threads about this but they are all pretty old and I didn't want to necro-post. If you are having trouble with an error in the console about not being able to load sourcemap you can put this file in the libs folder of your js folder and it will fix it.
PIXI.JS.MAP: DOWNLOAD - CDNPKG
Download pixi.js.map or get a CDN url for 60 versions of pixi.js.
www.cdnpkg.com