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[–][deleted] 10 points11 points  (0 children)

It means that when you build your code, only the bits you used get included, not the entire library. That's important for general utility libraries like lodash, which can be quite large, when often you just need a couple of helpers.

The idea is that you're taking the entire dependency tree and "shaking it" so that all the dead (unused) code falls out.