I'm on MacOS

Master is currently was broken because of electron upgrade in this commit

HTR:

• Checkout master and resintall dependencies (rm -Rf node_modules && yarn)
• Launch Hyper (npm run dev and npm run app)
• Open DevTools
• Hit ctrl key

An exception occurs:

It sounds crazy because code (and const cache declaration) is ok. I have checked with electron v1.4.16 and everything is allright!

I studied this issue in depth and I found a closure problem with isAccelerator function.
With v1.4.16:

But with 1.6.6 a closure (with cache variable) is missing:

I don't know yet if it is a V8 issue (I strongly doubt that).
But I found an Electron related issue: webpack use some eval

If this issue is confirmed, due to its nature, we can suppose there is another issues with this same scope cause. I would recommend to stick to stable release channel of electron (v1.4.16).