Cannot use bluebird Promise IE11 webpack

Question

I'm making an web app by using webpack, angularjs and bluebird. I put this in my code:

{
"plugins":[
    {
        new webpack.ProvidePlugin({Promise: 'bluebird'})
    }
  ]
}

But in developer console. Promise doesn't appear as a global variable. When I tried using it, console said: 'Promise is undefined'

Can anyone help me please? Thank you,