editor.js/.babelrc

{
 "presets": [
    ["@babel/preset-env", {
      "modules": "umd",
      "useBuiltIns": "entry",
      "corejs": 3
    }]
  ],
  "plugins": [
    "babel-plugin-add-module-exports",
    "babel-plugin-class-display-name",
    "@babel/plugin-transform-runtime"
  ],
  "env": {
    "test": {
      "plugins": [ "istanbul" ]
    }
  }
}