hot reload not working in v9 with global bluebird promise

[vugman]

Bug report

Describe the bug

When using bluebird Promise as default the hot reload doesn't work in v9

The error we get - EventSource's response has a MIME type ("text/plain") that is not "text/event-stream". Aborting the connection..

To Reproduce

Steps to reproduce the behavior, please provide code snippets or a repository:

1. Set global.Promise = require('bluebird')
2. Run dev server
3. See error in browser console

Expected behavior

Hot reload should work

System information

• Version of Next.js: 9.x

Additional context

Our projects infrastructure uses bluebird Promise and to make sure all of our projects are aligned we set global.Promise = require('bluebird') (which is a common pattern).

Once we tried to upgrade to v9 we started getting errors related to hot reloading and basically it hasn't been working since then.

The error we get is EventSource's response has a MIME type ("text/plain") that is not "text/event-stream". Aborting the connection..

If we remove that global Promise override the hot reload works again (yet, other parts of our infra. stop working..)

Since everything worked perfectly fine in the latest v8, I was wondering what changed in v9+ that might have affected this so I could try and solve this.

Thanks

[balazsorban44]

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