I created https://github.com/JamieMason/shrinkpack https://github.com/JamieMason/shrinkpack in 2015 to try and help with this problem, by creating an offline mi

I created https://github.com/JamieMason/shrinkpack https://github.com/JamieMason/shrinkpack in 2015 to try and help with this problem, by creating an offline mirror of decompressed tarballs from the npm registry that you'd check into your repository. I thought it might have some merit at the time, but it never really took off as an idea.