li18nType-safe i18n for TypeScript

Define your messages in JSON, get fully-typed TypeScript functions out. No runtime parsing, no stringly-typed keys.

Fully Typed

Every message key becomes a typed TypeScript function. Variables and conditionals are reflected in the function signature — caught at compile time, not runtime.

Conditionals & Pluralization

Boolean, string, and number conditionals with case-based dispatch. Number cases support JS comparison operators for pluralization.

Async-Safe Locale Scoping

Built-in AsyncLocalStorage support via withLocale() — isolate locale per-request in servers and Discord bots without global state collisions.