html/no-duplicate-class

Disallow duplicate class names in a static class attribute

Bad · Good

Default severity: warning
Presets: nuxt, opinionated
Automatic fix: None; review the suggested change
Applies to: Vue SFC templates and blocks, with script context where the rule requires it
Options: No rule-specific options. Severity and preset selection are configurable.

Configuration (Vite+)

import { defineConfig } from "@vizejs/vite-plugin/vite-plus";

export default defineConfig({
  lint: {
    vize: {
      "preset": "incremental",
      "rules": {
        "html/no-duplicate-class": "warn"
      }
    },
  },
});

vp run lint

Bad

The static class list repeats the btn token.

<template>
<div class="btn btn primary">click</div>
</template>

Good

The class list keeps one btn token and the distinct primary token.

<template>
<div class="btn primary">click</div>
</template>

Good avoids this rule's finding under the configuration above; other rules may still report diagnostics.

Implementation · All rules