systemjs-importmap.json:

{
	"imports": {
		"vue": "https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.min.js",
		"vue-class-component": "https://cdn.jsdelivr.net/npm/[email protected]/dist/vue-class-component.min.js"
	}
} 

Adding vue-class-component decorator to my Vue repo caused an error
TypeError: vue_class_component_1.default is not a function

Way to reproduce:

1. npm run deploy
2. npm run www
3. browser loading http://localhost:3000/