# vue/no-duplicate-attributes

disallow duplication of attributes

⚙️ This rule is included in all of "plugin:vue/vue3-essential", "plugin:vue/essential", "plugin:vue/vue3-strongly-recommended", "plugin:vue/strongly-recommended", "plugin:vue/vue3-recommended" and "plugin:vue/recommended".

When duplicate arguments exist, only the last one is valid. It's possibly mistakes.

# 📖 Rule Details

This rule reports duplicate attributes. v-bind:foo directives are handled as the attributes foo.

<template>
  <!-- ✓ GOOD -->
  <MyComponent :foo="abc" />
  <MyComponent foo="abc" />
  <MyComponent class="abc" :class="def" />

  <!-- ✗ BAD -->
  <MyComponent :foo="abc" foo="def" />
  <MyComponent foo="abc" :foo="def" />
  <MyComponent foo="abc" foo="def" />
  <MyComponent :foo.a="abc" :foo.b="def" />
  <MyComponent class="abc" class="def" />
</template>

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# 🔧 Options

{
  "vue/no-duplicate-attributes": ["error", {
    "allowCoexistClass": true,
    "allowCoexistStyle": true
  }]
}

allowCoexistClass (boolean) ... Enables v-bind:class (opens new window) directive can coexist with the plain class attribute. Default is true.
allowCoexistStyle (boolean) ... Enables v-bind:style (opens new window) directive can coexist with the plain style attribute. Default is true.

# `"allowCoexistClass": false, "allowCoexistStyle": false`

<template>
  <!-- ✗ BAD -->
  <MyComponent class="abc" :class="def" />
  <MyComponent style="abc" :style="def" />
</template>

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# 🚀 Version

This rule was introduced in eslint-plugin-vue v3.0.0

# 🔍 Implementation

← vue/no-dupe-v-else-if vue/no-mutating-props →