Translations#

Messages are nested TypeScript objects. Leaves are strings or plural objects.

export const en = {
  navigation: {
    home: "Home",
    settings: "Settings",
  },
  greeting: "Hello {name}",
  notifications: {
    zero: "No notifications",
    one: "{count} notification",
    other: "{count} notifications",
  },
} as const;

Nested strings use dot-separated keys:

i18n.t("navigation.settings");

Use the fallback locale as the canonical schema:

export const de = {
  // ...
} satisfies Messages<typeof en>;

Messages<T> checks structure while allowing translated string values. Missing or incorrectly shaped entries become TypeScript errors. At runtime, a missing entry is looked up through the fallback chain and finally returns its key.