Keyword as const on locale const

[lorenzotomasi]

Why in locales _lib files, only when an Array is present, its present the as const keyword?

Also, why are these constants not exported?

An example from src/locale/it/_lib/localize/index.ts with the keyword

const eraValues = {
  narrow: ["aC", "dC"] as const,
  abbreviated: ["a.C.", "d.C."] as const,
  wide: ["avanti Cristo", "dopo Cristo"] as const,
};

An example from src/locale/it/_lib/localize/index.ts without the keyword

const dayPeriodValues = {
  narrow: {
    am: "m.",
    pm: "p.",
    midnight: "mezzanotte",
    noon: "mezzogiorno",
    morning: "mattina",
    afternoon: "pomeriggio",
    evening: "sera",
    night: "notte",
  },
  abbreviated: {
    am: "AM",
    pm: "PM",
    midnight: "mezzanotte",
    noon: "mezzogiorno",
    morning: "mattina",
    afternoon: "pomeriggio",
    evening: "sera",
    night: "notte",
  },
  wide: {
    am: "AM",
    pm: "PM",
    midnight: "mezzanotte",
    noon: "mezzogiorno",
    morning: "mattina",
    afternoon: "pomeriggio",
    evening: "sera",
    night: "notte",
  },
};

[joaopedrodcf]

You mean what the as const syntax does ?

[lorenzotomasi]

Generate a nested readonly typed object if I’m not remembering right.
Btw my question was relative to the fact that only the array use that keyword, and the fact that this constants are not exported.
I can immagine someone with the necessity to translate only some part of a date will benefit from this exported const