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Typesafe I18n

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Updated: 9 Oct 2025
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A fully type-safe and lightweight internationalization library for all your TypeScript and JavaScript projects.

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Overview

Typesafe-i18n is an innovative internationalization library designed specifically for TypeScript and JavaScript projects. With a focus on being lightweight and type-safe, it offers developers a robust solution to manage translations and localizations efficiently. Whether you’re working on frontend, backend, or API projects, typesafe-i18n aims to simplify the often complex task of handling language variations in a seamless manner, ensuring your applications resonate with users worldwide.

This library enables developers to write less error-prone code while providing useful features that enhance the internationalization process. Its ease of use and extensive functionality make it an appealing choice for anyone looking to implement localization without sacrificing performance or type safety.

Features

  • Lightweight: At approximately ~1kb, typesafe-i18n adds minimal overhead to your project while delivering powerful functionalities.
  • Easy Syntax: The user-friendly syntax allows developers to implement internationalization effortlessly, making adoption smoother.
  • Performance Efficiency: Designed to be fast, it ensures that translations load quickly and do not slow down application performance.
  • Type Safety: Prevents common mistakes by providing type-checking capabilities, which is especially beneficial in TypeScript and plain JavaScript projects.
  • Boilerplate Generation: Automatically creates necessary boilerplate code, saving time and reducing repetitive tasks for developers.
  • Pluralization Support: Effectively manages grammatical plural rules, ensuring accurate translations for different languages.
  • Locale Formatting: Handles locale-dependent date and number formats, making it suitable for a global audience.
  • Asynchronous Loading: Offers the option to asynchronously load locales, enhancing performance and user experience.
  • SSR Support: Fully compatible with Server-Side Rendering, making it versatile for various application architectures.