TL;DR You can offload CPU intensive code using Node’s worker threads module. A demo app of the effect of this can be found here.
I thought I understood Node’s async mode. I’ve used callbacks, I’ve used promises and I’ve used async/await. I’ve dealt with unhandled promise rejections and I’ve worked out how to use try and catch with async tasks.
I thought I’d mastered the async model before and been rudely awakened by some unexpected behaviour. It has been a long time since one of those rude awakenings and by now I thought I really had mastered async.
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