This is a fairly large module on NPM at 9.6MB installed (see [npmx](https://npmx.dev/package/libphonenumber-js/v/1.12.40)). It looks like there's some low-hanging fruit for improving its bundle size: one major thing is that the NPM module includes test files. Excluding test files from the NPM build shrinks it by about 10% in my testing. The simplest way to do this would be to add *.test.ts to the [npmignore](https://gitlab.com/catamphetamine/libphonenumber-js/-/blob/master/.npmignore?ref_type=heads) file to keep those files out of the built package. It's less clear to me, but it also looks like the `build/` directory could be excluded to save another 2.3MB, and the build-scripts directory to save another 66kB. Happy to roll PRs for these if helpful.