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typesafe-i18n
A fully type-safe and lightweight internationalization library for all your TypeScript and JavaScript projects.
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I had reasonable success with https://github.com/kaisermann/svelte-i18n in one of my pet projects.
I have build my own i18n solution because I was not satisfied with the existing ones. Maybe it also fits your needs: https://github.com/ivanhofer/typesafe-i18n
Tolgee now supports Svelte :) https://www.npmjs.com/package/@tolgee/svelte It's not just a library, but also a open-souce localization platform with lot of features.