import i18next from 'i18next'

declare module 'i18next' {
  interface CustomTypeOptions {
    enableSelector: 'optimize'
    defaultNS: 'translation'
    resources: {
      translation: {
        abc: {
          ghi: 'abc::ghi'
          jkl: 'abc::jkl'
        }
        def: {
          mno: 'def::mno'
          pqr: 'def::pqr'
        }
      }
    }
  }
}

const ex_01 = i18next.t($ => $.abc.ghi)
//     ^? const ex_01: "abc::ghi"

const ex_02 = i18next.t($ => $.def.mno)
//     ^? const ex_02: "def::mno"