Syntax error on IE11 (or any browser without arrow-functions support)

Expected Behavior

It should be possible to access the application with older browsers when running next dev.

Current Behavior

IE11, for instance, throws a Syntax error when executing main.js.

Steps to Reproduce (for bugs)

1. Install Next.js
2. Create a demo page
3. Run next dev
4. Access application using IE11

I’ve setup a repo to reproduce the bug: https://github.com/lucasconstantino/next-ie11-syntax-error

Context

I’m having a hard time testing my application on IE11 locally.

Your Environment

Tech	Version
next	4.1.4
node	7.10.0
OS	any windows (tested on browserstack)
browser	IE11

[lucasconstantino]

Pasting some lines of code related to the problem, so to make it appear on search in case anyone needs it:

node_modules/next/node_modules/strip-ansi/index.js:4:

module.exports = input => typeof input === 'string' ? input.replace(ansiRegex(), '') : input;

node_modules/next/node_modules/ansi-regex/index.js:3:

module.exports = () => {
		'(?:(?:\\d{1,4}(?:;\\d{0,4})*)?[\\dA-PRZcf-ntqry=><~]))'

[mgiraldo]

@timneutkens what polyfills do I need for it to work on ie11?