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Using a lockfile and checking in your dependency tarballs [1] can help insulate you from these problems until you're ready to face them.

I created shrinkpack before left-pad and thankfully it meant that we were unaffected.

A lot of developers, understandably, baulk at checking in dependencies, but there is a concrete benefit in being able to continue uninterrupted during outages.

[1] https://github.com/JamieMason/shrinkpack