Q: Are Node.js, Electron, and other @v8js embedders impacted by SSCAs such as Spectre/Meltdown?
A: https://github.com/v8/v8/wiki/Untrusted-code-mitigations …pic.twitter.com/gOP9qYTbGQ
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Both scenarios (supporting trusted AND untrusted code) are outlined on the page I linked to.