Offline story of the up-to-date detection logic

[oliviertassinari]

Bug report

Describe the bug

I believe we miss the offline story of the up-to-date detection logic. I'm working in the train, with a Li-Fi connection (crappy).

If you are lucky, it fails fast with the following error:

However, if the connection lies to you (Li-Fi, it think it has internet but it doesn't) then you are stuck. The dev server refuses to start. He is waiting for a network request to complete.
After 1-2 minutes, you will get the following error:

To Reproduce

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

1. Start the dev server without internet or with a fake internet connection
2. See error

Expected behavior

I don't think that the up-to-date feature is important enough to harm offline development (we already have yarn oudated to solve this problem).

System information

• Version of Next.js: 6.0.4-canary.8

[oliviertassinari]

It's a win for the DX, thanks!