How can I find the default rules for phone numbers in the google-libphonenumber NPM package?

I’m using the google-libphonenumber NPM package to format and parse phone numbers, specifically for New Zealand. I want to understand which default rules are applied when parsing and formatting phone numbers. Is there a way to access or view the rules used by the library for a specific region, like New Zealand?

Example:

When parsing, what are the default formatting rules applied by google-libphonenumber?
Any help would be appreciated!

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