'Symbol' is undefined in IE after using babel

Question

I have a reactjs app written using ES6 standards, and I use webpack to build it. The webpack loads the js modules using <

Answer 1

in documentation about Runtime

// in bash
npm install babel-transform-runtime --save-dev

// in gulpfile
.pipe(babel({
  plugins: ['transform-runtime']
}))

edit: better yet on heroku in prod mode use --save instead of --save-dev