i18n (Internationalization and localization) in Typescript using `satisfies` only

i18n-satisfies.ts

type Message = string | ((args: any) => string);
type Translation = { en: Message; it: Message };

export type I18n = Record<string, Translation>;

export const t = {
  helloWorld: {
    en: "Hello World",
    it: "Ciao mondo",
  },
  helloParam: {
    en: (param: string) => `Hello ${param}` as const,
    it: (param: number) => `Ciao ${param}` as const,
  },
} as const satisfies I18n;

const helloWorld = t.helloWorld["it"];
const helloParamEn = t.helloParam["en"]("world");
const helloParamIt = t.helloParam["it"](10);