eslint-plugin-vue

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vue/no-duplicate-attributes ​

disallow duplication of attributes

  • ⚙️ This rule is included in all of "plugin:vue/essential", *.configs["flat/essential"], "plugin:vue/vue2-essential", *.configs["flat/vue2-essential"], "plugin:vue/strongly-recommended", *.configs["flat/strongly-recommended"], "plugin:vue/vue2-strongly-recommended", *.configs["flat/vue2-strongly-recommended"], "plugin:vue/recommended", *.configs["flat/recommended"], "plugin:vue/vue2-recommended" and *.configs["flat/vue2-recommended"].

When there are multiple attributes with the same name on a component, only the last one is used and the rest are ignored, so this is usually a mistake.

📖 Rule Details ​

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

json
{
  "vue/no-duplicate-attributes": ["error", {
    "allowCoexistClass": true,
    "allowCoexistStyle": true
  }]
}
  • allowCoexistClass (boolean) ... Enables v-bind:class directive can coexist with the plain class attribute. Default is true.
  • allowCoexistStyle (boolean) ... Enables v-bind:style 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 ​