html-validate-vue

Vue.js plugin for HTML-Validate.

• Transforms single file components and template strings.
• Augments element metadata for usage with components.
• Definitions for <slot> and <transition> elements.
• Additional rules.

Usage

npm install --save-dev html-validate-vue

In .htmlvalidate.json:

{
  "plugins": ["html-validate-vue"],
  "extends": ["html-validate:recommended", "html-validate-vue:recommended"],
  "elements": ["html5"],
  "transform": {
    "^.*\\.vue$": "html-validate-vue"
  }
}

The default is to internally autodetect what transforms to apply based on filename. For normal usage this is usually ok but it can be explicitly set by using one of these named transforms:

• html-validate-vue:auto: best match based on filename (default). *.vue uses sfc, *.{jsx?,tsx?} uses js and other files uses html to apply hooks only.
• html-validate-vue:js: transform a javascript file by looking for objects with a template property.
• html-validate-vue:html: transform a html file (only applying hooks).
• html-validate-vue:sfc: transform a single-file component.

Vue CLI

If you're using Vue CLI you can add the CLI plugin:

vue add html-validate
vue-cli-service html-validate

Supported elements

• <component>
• <keep-alive>
• <router-link>
• <router-view>
• <slot>
• <transition>

Rules

Rule	Recommended	Description
vue/available-slots	Error	Validate usage of slots. Only known slots may be used.
vue/prefer-slot-shorthand	Error	Prefers the usage of #foo over v-slot:foo.
vue/required-slots	Error	Validate required slots. Required slots must be used.

Element metadata

Property	Datatype	Description
component	string	Component uses <component is=".."> to wrap content
slots	string[]	List of available slots.
requiredSlots	string[]	List of required slots.

Slots

Components with slots can add element metadata for the slot using ${component}:${slot} syntax, e.g my-component:my-slot.

Given a component like this:

<template>
  <div>
    <div class="my-component-heading">
      <slot name="heading"></slot>
    </div>
    <div class="my-component-body">
      <slot name="body"></slot>
    </div>
    <div class="my-component-footer">
      <slot name="footer"></slot>
    </div>
  </div>
</template>

Metadata for the component itself is written as normally:

{
  "my-component": {
    "flow": true,
    "slots": ["heading", "body", "footer"],
    "requiredSlots": ["body"]
  }
}

Metadata for the slots is written as normally with the exception of the keys. Each key is prefixed with its parent/component and delimited by # and ending with its slot name:

{
  "my-component#heading": {
    "permittedDescendants": ["@heading"]
  },
  "my-component#body": {
    "permittedContent": ["@flow"]
  },
  "my-component#footer": {
    "permittedContent": ["@phrasing"]
  }
}

# is used as a delimiter due to it being the official shorthand for slots in Vue.

Note: unless the default slot is wrapped in v-slot:default it will not be validated by my-component#default but by the component element itself. This can be miltigated by adding default as a required slot.

Dynamic components

If your component uses <component is=".."> to dynamically select element the component property marks which attribute selects the tagname.

<template>
  <div>
    <component :is="tagname">
      <slot></slot>
    </component>
  </div>
</template>

<script>
Vue.component("my-component", {
  props: ["tagname"],
});
</script>

The corresponding metadata would look like this:

{
  "my-component": {
    "component": "tagname"
  }
}

Using this the following markup would yield an error:

<my-component tagname="label">
  <div>A div cannot be inside a label</div>
</my-component>

When using named slots the component property goes directly onto the slot metadata:

{
  "my-component#default": {
    "component": "tagname"
  }
}

The attribute is always read from the component itself, not the slot <template> element:

<my-component tagname="label">
  <template v-slot:default>...</template>
</my-component>