When and How to add polyfills to a vue-cli app

Question

I have a vue-cli 3 app created, and seeing some error messages logged about some JS methods not existing in some browsers.

One error is that AbortController is not defined.

My questions are:

1. Was my assumption correct that the default vue-cli webpack configuration would add polyfills for these features, such as fetch, or const keywords?

2. Assuming there are some features which aren't polyfilled by default, how can I add a specific one, like AbortController or fetch?

                    **.browserslistrc**
> 1%
last 2 versions
not ie <= 8

                    **vue.config.js**
module.exports = {
    pwa: {...}
}