A cute JS project that automatically instantiates controllers based on the HTML you've loaded, allowing you to easily add logic to pages using Turbolinks:
miniblog.
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GQless takes an elegant approach of deriving GraphQL queries directly from your controllers. You write code in typescript (tab-completed etc), and it generates queries!
I'm often surprised by simple devices that are fully programmable. E.g. HD controllers. At least GSM isn't so cheap that they're all online.