I have a big problem.I setup grunt configuration for magento 2.3 as I used to setup for magento 2.2 and renamed below files
gruntfile.js.sample by removing .sample from their name and installed node_modules through below command.
However When I refreshed magento admin, it's not showing any css in magento admin.
I don't know what the problem is but whenever I removed the generated package.lock.json from root admin started working as expected.
Also I created local-themes.js at
dev\tools\grunt\configs location and added my theme name for grunt compilation purpose but admin css was not showing.
So please help.