feat: add Paths type for type safety

[aralroca]

Related with #721

After this feature (adding Paths), is possible to define next-translate.d.ts like this:

import type { Paths, I18n, Translate } from 'next-translate'

export interface TranslationsKeys {
  common: Paths<typeof import('./locales/en/common.json')>
  home: Paths<typeof import('./locales/en/home.json')>
}

export interface TypeSafeTranslate<Namespace extends keyof TranslationsKeys>
  extends Omit<I18n, 't'> {
  t: {
    (
      key: TranslationsKeys[Namespace],
      ...rest: Tail<Parameters<Translate>>
    ): string
    <T extends string>(template: TemplateStringsArray): string
  }
}

declare module 'next-translate/useTranslation' {
  export default function useTranslation<
    Namespace extends keyof TranslationsKeys
  >(namespace: Namespace): TypeSafeTranslate<Namespace>
}

Then type safety should work:

[itxtoledo]

Awesome!

[matthewlewandowski93]

So awesome!
Just in case anyone else runs into this, the inline imports did not work for me, but this did.

import home from "./locales/en/home.json";
import common from "./locales/en/common.json";

export interface TranslationsKeys {
  common: Paths<typeof common>;
  home: Paths<typeof home>;
}

[hichemfantar]

@aralroca this doesn't seem to work with the getT function.

any ideas on how to get it to work?