Edit

@babel/plugin-external-helpers

npm install --save-dev @babel/plugin-external-helpers

Usage

With a configuration file (Recommended)

{
  "plugins": ["@babel/plugin-external-helpers"]
}

Via CLI

babel --plugins @babel/plugin-external-helpers script.js

Via Node API

require("@babel/core").transformSync("code", {
  plugins: ["@babel/plugin-external-helpers"]
});