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Type-safe ISO 639-1 language code for TypeScript

This library provides a set of functions to work with ISO 639-1 language codes, a.k.a. two-letter language codes, in very type-safe way.

Although it does not introduce any new runtime types, it provides the LanguageCode type, which is a narrowed-down version of the string type that contains only valid two-letter language codes defined in the ISO 639-1.