`rollup` hangs for no apparent reason

[decorator-factory]

I was trying to Dockerize the project and I ran into a problem here:

pyright-playground/Dockerfile

Lines 16 to 22 in 5a10314

	# COPY frontend /src/frontend
	# WORKDIR /src/frontend
	# RUN npm i
	# RUN npm run build
	# RUN mkdir -p /build/frontend
	# RUN cp -r /src/frontend/public /build/frontend
	# RUN rm -rf /src/frontend

npm run build (which runs npm exec -- rollup -c) hangs after completing the build. I have no idea why that's happening or how to debug it.