@intlify/vue-i18n/no-duplicate-keys-in-locale 
disallow duplicate localization keys within the same locale
If you manage localization messages in multiple files, duplicate localization keys across multiple files can cause unexpected problems.
📖 Rule Details 
This rule reports duplicate localization keys within the same locale.
👎 Examples of incorrect code for this rule:
locale messages:
- en.1.json
👍 Examples of correct code for this rule:
locale messages:
- en.1.json
⚙️ Options 
json
{
  "@intlify/vue-i18n/no-duplicate-keys-in-locale": [
    "error",
    {
      "ignoreI18nBlock": false
    }
  ]
}- ignoreI18nBlock: If- true, do not report key duplication between- <i18n>blocks and other files, it set to- falseas default.
👫 Related Rules 
🚀 Version 
This rule was introduced in @intlify/eslint-plugin-vue-i18n v0.9.0