Request: run against local package

[donifer]

Please describe the feature/suggestion It would be awesome if we can run this again a local package. That way we could verify we are tree-shaking properly before publishing a module to npm.

Describe the solution you'd like Add a cli or a way to run this again a local build directory.

Describe any alternatives you've considered None so far

[harshzalavadiya]

Maybe if we can upload npm pack generated archive and bundlephobia can analyse on that

[prantlf]

... or produce a command-line client using the same algorithm as bundlephobia.

[pastelsky]

https://github.com/pastelsky/package-build-stats now supports building local packages.