How to obtain a registry of consulted keys

[auirarrazaval]

So I have a very big legacy project where i18n was used for translation, but one of the languages was a little left behind. A while back we started refactoring, which led to changing many keys, and adding some others. The thing is that now, a new language wants to be added, and the one that was left behind needs to be updated. Therefore, I wanted to know if there is any plugin/setting/etc... that would allow me to log into a log file of some sort all keys that are consulted in runtime. I know that there's i18n-extract that does static file analysis, but that leaves out dynamically set values.
This log file would be very as a first filter to clean and complete old and new jsons

I'm using VUE 2 / vue-i18n v8.x

Thank you for your help!

[auirarrazaval]

Ok so, after some code inspection, I realized that there's a postTranslation hook that can be used for this purpose. From the call of it, I figured that it's interface is that it receives two arguments: the translated value and the key used to fetch it, and needs to return the translation.

I think it’s a cool feature, that I couldn't find anywhere in the documentation really, and could be nice to add it there!

Dummy example of my setup that allows me to log every computed key:

export default new VueI18n({
  locale: process.env.VUE_APP_I18N_LOCALE || 'es',
  fallbackLocale: process.env.VUE_APP_I18N_FALLBACK_LOCALE || 'es',
  messages: loadLocaleMessages(),
  postTranslation: (translatedValue, key) => {
    console.log(`i18n(${key}) => ${translatedValue}`);
    return translatedValue;
  },
});```

then i get something like 
`> i18n(hello.world) => Hello, World!`