add babel

[argyleink]

{
  "plugins": [
    "@babel/plugin-proposal-class-properties",
    "@babel/plugin-proposal-private-methods",
    "@babel/plugin-proposal-object-rest-spread"
  ]
}

    "@babel/core": "^7.8.0",
    "@babel/plugin-proposal-class-properties": "^7.8.0",
    "@babel/plugin-proposal-object-rest-spread": "^7.8.0",
    "@babel/plugin-proposal-private-methods": "^7.8.0",
    "rollup-plugin-babel": "^4.3.3",

import babel from 'rollup-plugin-babel'

babel() in plugins

Why

i dont always need it, and what it adds is usually aesthetic mostly.. but can be good for modern authoring and transformed bundles (if needed). could just keep this here for reference too..