How to add babel-polyfill to the project

Hi,
How can I add babel-polyfill to ionic project ?
using ionic latest version
I tried adding minified verion of babel-polyfill to index.html and i was getting t.resolve error
I also tried adding it to webpack.confi file

entery : entry: [“babel-polyfill”, process.env.IONIC_APP_ENTRY_POINT] in devconf

but no luck
any idea how to add babel-polyfill to project.

Thank You