Decorators only for browser-es native modules

.babelrc

{
  "plugins": ["transform-decorators-legacy"]
}

build command

babel src --out-dir dist --source-maps inline --copy-files

output file

var _dec, _dec2, _class;

import "/node_modules/slim-js/Slim.js";
import { tag, template } from '/node_modules/slim-js/Decorators.js';

let _default = (_dec = tag('hello-app'), _dec2 = template('<h1>Hello</h1>'), _dec(_class = _dec2(_class = class _default extends Slim {
  onRender() {
    debugger;
  }
}) || _class) || _class);

export { _default as default };
// HERE COMES SOURCE MAPS FOR DEV MODE

source code

import "/node_modules/slim-js/Slim.js";
import {tag, template } from '/node_modules/slim-js/Decorators.js'

@tag('hello-app')
@template('<h1>Hello</h1>')
export default class extends Slim {
  onRender () {
    debugger
  }
}