Fix electron require

[Rigellute]

Turns out that using import from electron causes the error

fs.existsSync is not a function

when running yarn cosmos.

Fix is to use require instead of import.

[andyrichardson]

@Rigellute what was the issue you were seeing before?

Electron imports are ignored when building cosmos. Maybe you had the BUILD_ENV environment variable set to electron?

[wgolledge]

It was TypeError: fs.existsSync is not a function happening on all cosmos instances (Netlify deploy etc). I'm guessing the ignore might still do the import but then doesn't include it?

[andyrichardson]

@wgolledge thanks for clearing that up! I thought it might have been a local reproduction issue.

Do we know when it was first introduced? I assume it was after a dependency update but can't source the first occurrence.

[wgolledge]

I do indeed! Basically just when the inline require was flipped to import #296