Hot module replacement not working in IE

[saranshkataria]

Description

I get a console error: webpack-hot-middleware's client requires EventSource to work. You should include a polyfill if you want to support this browser: https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events#Tools

Steps to reproduce

1. Create new project
2. Run gatsby develop
3. open IE
4. (warning shows in console)

Expected result

HMR should work in IE

Actual result

HMR is not working

[saranshkataria]

Seems like event-source-polyfill needs to be added to the project and then an entry needs to be made in the webpack config for importing it before importing webpack-hot-middleware/client. If I am on the right track, would like to create a PR for it

[sidharthachatterjee]

So isn't supported on IE or Edge according to https://caniuse.com/#feat=eventsource

@saranshkataria Thank you for the debugging on this. We'd love to receive a PR!

[saranshkataria]

I will start working on it

[JodiWarren]

This seems to have regressed at some point. In IE11, I get the same message as in the original post: webpack-hot-middleware's client requires EventSource to work. I haven't yet worked out whether this is an issue upstream or in Gatsby's implementation.

[sidharthachatterjee]

@JodiWarren Interesting. Let me reopen this if that's the case.

I haven't yet worked out whether this is an issue upstream or in Gatsby's implementation.

Do let us know if you manage to work this out!

[chandlervdw]

This seems to have regressed at some point.

+1 this polyfill no longer works. @JodiWarren any luck tracking down if this is upstream or within Gatbsy?

[github-actions]

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[github-actions]

Hey again!

It’s been 30 days since anything happened on this issue, so our friendly neighborhood robot (that’s me!) is going to close it.
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Thanks again for being part of the Gatsby community! 💪💜