Once() {
		return (css, result) => {
			result.root.rawCache = {
				colon: ':',
				indent: '',
				beforeDecl: '',
				beforeRule: '',
				beforeOpen: '',
				beforeClose: '',
				beforeComment: '',
				after: '',
				emptyBody: '',
				commentLeft: '',
				commentRight: ''
			};
		};
	}
cssnano is great, but it's hard to package and quite large.
This is essentially the same plugins, but without SVGO.