How to correctly specify the key type in TypeScript?

Question

JavaScript

interface LangKey {
  header: string,
  content: string
}

interface Lang {
  en: LangKey,
  ru: LangKey,
}


const translation: Lang = {
  en: {
    'header': 'Header content',
    "content": 'Content'
  },
  
  ru: {
    'header': 'Хедер контент',
    "content": 'Контент'
  }
}

export const getTranslation = (text: string, lang:string) => {
  return translation[lang][text];
}

return translation[lang][text];

gives this error Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Lang'.

Tell me how to deal with it

Answer 1

https://www.typescriptlang.org/docs/handbook/2/key...