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> Note: Yes, both these methods are synchronous. But, given that neither of these methods require any I/O orNetwork requests, its pretty safe to compute them synchronously.

Found this amusing. Are node devs so used to async that disclaimers like this are necessary?

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yes, Node is single threaded so any one thread that blocks the event loop for a significant amount of time becomes a significant performance bottleneck. Generally functions like bcrypt require an asynchronous API.

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