error of default is not a function with systemjs-importmap

[viT-1]

systemjs-importmap.json:

{
	"imports": {
		"vue": "https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.min.js",
		"vue-class-component": "https://cdn.jsdelivr.net/npm/vue-class-component@7.1.0/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/

[viT-1]

related: systemjs/systemjs#1989

[ktsn]

This is because the way UMD build exposes the decorator is different with ESModule. Using ESM build should fix the problem.

[viT-1]

@ktsn Thank you for new vue-class-component version! Waiting for vue-property-decorator version update (with esm support).

[ktsn]

/cc @kaorun343