I asked this on the Slack a while ago, and @knolleary responded (and feel free to correct me again), that with NR now requiring a minimum of NodeJS v8.5, there is no reason not to use ES6+ in your code, both for function nodes as well as custom nodes. Async functions should be compatible with Node v8.5 from my own research, but I’m not sure in what context function nodes are executed, so have you tried checking the source of that node yet?
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