First, I know this is bleeding edge, but perhaps interesting for future Electron / nw.js exports.
I am using a plugin with DOM side scripts (Greengrinds an extended version of the official Greenworks plugin.)
With the plugin, my game exported and I built an Electron version with efc. It works well from Electron 3.x to 6.x (chromium 76, node 12.4.) However, for Electron 7.0.0-beta.3 (chromium 78, node 12.8), it looks like the domSide.js script is no longer loading in the DOM, it _appears_ to be running in the renderer. The evidence is the require stack has changed and I have had to change
Once done that works, but it still seems like my DOM side script is not running on the DOM side anymore in this later version of Electron/Chrome/Node. I know this is all bleeding edge, so I don't expect everything to work, but I thought it was interesting enough to mention in the forum in case someone else has an insight into it.