@intlify/vue-i18n/key-format-style 
enforce specific casing for localization keys
This rule aims to enforces specific casing for localization key names.
camelCaseKey: The key for this value is camel case.
kebab-case-key: The key for this value is kebab case.
lowercase: The key for this value is lower case.
snake_case_key: The key for this value is snake case.
mixed_Case-key: Perhaps you don't want to use this casing.📖 Rule Details 
This rule reports localization keys other than the specific casing. Also, the following localization key definitions are reported as errors, because the casing cannot determine.
👎 Examples of incorrect code for this rule:
⚙️ Options 
{
  "@intlify/vue-i18n/key-format-style": [
    "error",
    "camelCase" | "kebab-case" | "lowercase" | "snake_case",
    {
      "allowArray": false,
      "splitByDots": false
    }
  ]
}- Primary Option: Select the casing you want to apply. It set to "camelCase"as default
- allowArray: If- true, allow the use of arrays. If- false, disallow the use of arrays. It set to- falseas default.
- splitByDots: If- true, check the values of the key name split by dots.
👍 Examples of correct code for this rule with "camelCase":
👎 Examples of incorrect code for this rule with "camelCase":
👍 Examples of correct code for this rule with "kebab-case":
👎 Examples of incorrect code for this rule with "kebab-case":
👍 Examples of correct code for this rule with "lowercase":
👎 Examples of incorrect code for this rule with "lowercase":
👍 Examples of correct code for this rule with "snake_case":
👎 Examples of incorrect code for this rule with "snake_case":
👍 Examples of correct code for this rule with {"allowArray": true}:
🚀 Version 
This rule was introduced in @intlify/eslint-plugin-vue-i18n v0.9.0