# Bug in deprecated.js not compiling
**URL:** https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687
**Category:** Bug
**Created:** [2016年九月26日 21:01 UTC](https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687 "2016-09-26T21:01:52Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@mbeale](https://meta.discourse.org/u/mbeale)
#### Post date: [2016年九月26日 21:01 UTC](https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687/1 "2016-09-26T21:01:52Z")
Users using IE10 (they’re not able to upgrade to IE11) see a blank screen after login.
It looks like ‘const’ on line 5 of assets/javascripts/deprecated.js is not being compiled/isn’t ES6.
I’m not sure how to fix, so submitting this bug note vs a PR. Am new to Discourse, so let me know if I should be doing things differently.
Thanks!
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### Author:  [@Mittineague](https://meta.discourse.org/u/Mittineague)
#### Post date: [2016年九月26日 21:11 UTC](https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687/2 "2016-09-26T21:11:44Z")
I don’t know how best to handle your situation.
> **[What is Discourse?](https://www.discourse.org/faq)**
>
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### Author:  [@Falco](https://meta.discourse.org/u/Falco)
#### Post date: [2016年九月26日 21:16 UTC](https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687/3 "2016-09-26T21:16:00Z")
IE10 is dead as of January this year, not supported by Microsoft.
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### Author:  [@mbeale](https://meta.discourse.org/u/mbeale)
#### Post date: [2016年九月26日 21:16 UTC](https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687/4 "2016-09-26T21:16:33Z")
it looks like all the other files are ES6, so backward compatible. would changing the extension of deprecated.js take care of it?
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### Author:  [@Falco](https://meta.discourse.org/u/Falco)
#### Post date: [2016年九月26日 21:18 UTC](https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687/5 "2016-09-26T21:18:21Z")
Oh I see the problem is IE10 users aren’t seeing the error message right? Let me try to repro.
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### Author:  [@mbeale](https://meta.discourse.org/u/mbeale)
#### Post date: [2016年九月26日 21:22 UTC](https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687/6 "2016-09-26T21:22:38Z")
Thanks! Yeah, they just see a blank screen.
But grepping shows this is the only `const` not getting compiled, so I think it’d work if we were able to change that.
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### Author:  [@Falco](https://meta.discourse.org/u/Falco)
#### Post date: [2016年九月26日 21:45 UTC](https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687/7 "2016-09-26T21:45:18Z")
[https://github.com/discourse/discourse/pull/4464](https://github.com/discourse/discourse/pull/4464)
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### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [2016年十月21日 05:22 UTC](https://meta.discourse.org/t/bug-in-deprecated-js-not-compiling/50687/8 "2016-10-21T05:22:58Z")