Subclassing Array doesn't work

[kasperpeulen]

I have the following code:

export default class Days extends Array {
  today() {
    return this.find(day => day.startedAt.isSame(moment(), 'day'));
  }
}

This code works if I just copy paste it to the chrome console, but not in create react app:

Anyway to get this to somehow transpile correctly? I tried importing babel-polyfill.

Also, is it possible to somehow tell create-react-app that I don't need to support IE11? Because I think that otherwise, this could work natively, and I wouldn't need a polyfill.

[kasperpeulen]

Ah there is an PR for that:
#2358

can we have that in :D

[miraage]

Anyway to get this to somehow transpile correctly?
Also, is it possible to somehow tell create-react-app that I don't need to support IE11?

Yes.

• npm run eject
• configure by yourself

[kasperpeulen]

I think using browerslist in package.json is a lot better, like babel-preste-env does it

[miraage]

@kasperpeulen agree. But if you need it ASAP - you got the plan.

[gaearon]

Yeah, it won't work until we allow targeting just modern browsers.

[kasperpeulen]

@gaearon would you take a PR that allows to set the babel-env browser option using the package.json browserlist field?

[kasperpeulen]

relates to: #892

[gaearon]

That's the plan.