Const causing IE9 bundle to break.

[syte]

• Operating System: Windows 10
• Node Version: 4.3.1
• NPM Version: 5.0.3
• webpack Version: 2.7.0
• webpack-dev-server Version: 2.8.1

• This is a feature request
• This is a bug

Code

Const in https://github.com/webpack/webpack-dev-server/blob/master/client/index.js is breaking IE9. Const is unsupported in ie9. It seems like the error was introduced here: 69239ce#diff-895656aeaccff5d7c0f56a113ede9662

Expected Behavior

Const shouldn't be used

Actual Behavior

Const is being used and breaking IE9.

For Bugs; How can we reproduce the behavior?

Running a bare config using webpack-dev-server with hot reloading.

[teod]

It breaks IE11 as well.

[shellscape]

@syte old-IE support ended in January 2016. Please see https://www.microsoft.com/en-us/windowsforbusiness/end-of-ie-support. Unfortunately you'll have to use an older version (2.7) if you'd like to continue to support old IE. Old IE support has been discontinued for so long that this can't be considered a breaking change, rather just catching up with the times.

@teod Hm I think you're mistaken on const breaking IE11. Please see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const

This isn't one we're going to be fixing I'm afraid. For those that still need to run this on old IE, you'll have to set your dependencies to 2.7.1.

[srgpqt]

const breaks iOS 9 too.