Optimize the editor experience with custom JavaScript & CSS in Neos – Included in https://speakerdeck.com/aertmann/tasty-recipes-for-every-day-neos

Root.ts2

prototype(Page) {
	head.stylesheets.backend = TYPO3.TypoScript:Tag {
		tagName = 'link'
		attributes {
			rel = 'stylesheet'
			href = TYPO3.TypoScript:ResourceUri {
				package = 'Venstre.VenstreDk'
				path = 'Styles/Backend.css'
			}
		}
		@if.onlyRenderWhenNotInLiveWorkspace = ${node.context.workspace.name != 'live'}
	}
	body.javascripts.backend = TYPO3.TypoScript:Tag {
		tagName = 'script'
		attributes {
			src = TYPO3.TypoScript:ResourceUri {
				package = 'Venstre.VenstreDk'
				path = 'JavaScript/Backend.min.js'
			}
			async = null
		}
		@if.onlyRenderWhenNotInLiveWorkspace = ${node.context.workspace.name != 'live'}
	}
}