Personally I don't know how to do it. But yes it is 6-7MBs. There is a video by Egghead but it is paid so if you already have a subscription you can watch it. You can check the companies using NWJS here which will give you an idea about size but it is less than Electron. Messenger which uses NWJS is 1.5MB. Checkout awesome-nwjs that might help you. I never used it so can't say about that.
Personally I don't know how to do it. But yes it is 6-7MBs. There is a video by Egghead but it is paid so if you already have a subscription you can watch it. You can check the companies using NWJS here which will give you an idea about size but it is less than Electron. Messenger which uses NWJS is 1.5MB. Checkout awesome-nwjs that might help you. I never used it so can't say about that.