Trigger an error when using a non-final key

[fbnlsr]

Please describe what the rule should do:

no-nonfinal-keys

The rule should trigger an error when the key used for translation is not final.

At the moment, if we ask for a translation on a key that is not final (meaning it contains child keys), no error is triggered. This is particularly problematic on large code bases where people might change the dictionary key layout.

What category should the rule belong to?

• Enforces code style (layout)
• Warns about a potential error (problem)
• Suggests an alternate way of doing something (suggestion)
• Other (please specify:)

Example:

<template>
  <button @click="submit">{{ t('app.save') }}
</template>

{
  "app": {
    "save": {
      "label": "Save"
    }
  }
}

eslint-plugin-vue-i18n should trigger an error as app.save is not a final key.