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noVueRefAsOperand

src/content/docs/linter/rules/no-vue-ref-as-operand.mdx

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import { Tabs, TabItem } from '@astrojs/starlight/components';

<Tabs> <TabItem label="JavaScript (and super languages)" icon="seti:javascript"> :::caution This rule is part of the [nursery](/linter/#nursery) group. This means that it is experimental and the behavior can change at any time. ::: ## Summary - Rule available since: `v2.4.5` - Diagnostic Category: [`lint/nursery/noVueRefAsOperand`](/reference/diagnostics#diagnostic-category) - This rule doesn't have a fix. - The default severity of this rule is [**error**](/reference/diagnostics#error). - This rule belongs to the following domains: - [`vue`](/linter/domains#vue) - Sources: - Same as [`vue/no-ref-as-operand`](https://eslint.vuejs.org/rules/no-ref-as-operand)

How to configure

json
{
	"linter": {
		"rules": {
			"nursery": {
				"noVueRefAsOperand": "error"
			}
		}
	}
}

Description

Disallow the use of value wrapped by ref()(Composition API) as operand

To access value wrapped by ref(), you must use .value.

Examples

Invalid

js
import { ref } from "vue"

const count = ref(0)
count++
<pre class="language-text"><code class="language-text">code-block.js:4:1 <a href="https://biomejs.dev/linter/rules/no-vue-ref-as-operand">lint/nursery/noVueRefAsOperand</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Ref value is accessed without </span><span style="color: Tomato;"><strong>&#96;.value&#96;</strong></span><span style="color: Tomato;">.</span> <strong>3 │ </strong>const count = ref(0) <strong><span style="color: Tomato;">&gt;</span></strong> <strong>4 │ </strong>count++ <strong> │ </strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>5 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Without </span><span style="color: lightgreen;"><strong>&#96;.value&#96;</strong></span><span style="color: lightgreen;">, Vue cannot track changes to the ref, which may break reactivity.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>&#96;.value&#96;</strong></span><span style="color: lightgreen;"> to access ref value.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit </span><span style="color: lightgreen;"><a href="https://biomejs.dev/linter/#nursery">https://biomejs.dev/linter/#nursery</a></span><span style="color: lightgreen;"> for more information.</span> </code></pre>
js
import { ref } from "vue"

const ok = ref(false)
const msg = ok ? "yes" : "no"
<pre class="language-text"><code class="language-text">code-block.js:4:13 <a href="https://biomejs.dev/linter/rules/no-vue-ref-as-operand">lint/nursery/noVueRefAsOperand</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Ref value is accessed without </span><span style="color: Tomato;"><strong>&#96;.value&#96;</strong></span><span style="color: Tomato;">.</span> <strong>3 │ </strong>const ok = ref(false) <strong><span style="color: Tomato;">&gt;</span></strong> <strong>4 │ </strong>const msg = ok ? &quot;yes&quot; : &quot;no&quot; <strong> │ </strong> <strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>5 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Without </span><span style="color: lightgreen;"><strong>&#96;.value&#96;</strong></span><span style="color: lightgreen;">, Vue cannot track changes to the ref, which may break reactivity.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>&#96;.value&#96;</strong></span><span style="color: lightgreen;"> to access ref value.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit </span><span style="color: lightgreen;"><a href="https://biomejs.dev/linter/#nursery">https://biomejs.dev/linter/#nursery</a></span><span style="color: lightgreen;"> for more information.</span> </code></pre>
js
import { ref } from "vue"

const ok = ref(false)
if (ok) {
  //
}
<pre class="language-text"><code class="language-text">code-block.js:4:5 <a href="https://biomejs.dev/linter/rules/no-vue-ref-as-operand">lint/nursery/noVueRefAsOperand</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Ref value is accessed without </span><span style="color: Tomato;"><strong>&#96;.value&#96;</strong></span><span style="color: Tomato;">.</span> <strong>3 │ </strong>const ok = ref(false) <strong><span style="color: Tomato;">&gt;</span></strong> <strong>4 │ </strong>if (ok) &#123; <strong> │ </strong> <strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>5 │ </strong> // <strong>6 │ </strong>&#125; <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Without </span><span style="color: lightgreen;"><strong>&#96;.value&#96;</strong></span><span style="color: lightgreen;">, Vue cannot track changes to the ref, which may break reactivity.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>&#96;.value&#96;</strong></span><span style="color: lightgreen;"> to access ref value.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit </span><span style="color: lightgreen;"><a href="https://biomejs.dev/linter/#nursery">https://biomejs.dev/linter/#nursery</a></span><span style="color: lightgreen;"> for more information.</span> </code></pre>
js
import { ref } from "vue"

export default {
  setup(_props, { emit }) {
    const count = ref(0)
    emit('increment', count)
  }
}
<pre class="language-text"><code class="language-text">code-block.js:6:23 <a href="https://biomejs.dev/linter/rules/no-vue-ref-as-operand">lint/nursery/noVueRefAsOperand</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Ref value is accessed without </span><span style="color: Tomato;"><strong>&#96;.value&#96;</strong></span><span style="color: Tomato;">.</span> <strong>4 │ </strong> setup(&#95;props, &#123; emit &#125;) &#123; <strong>5 │ </strong> const count = ref(0) <strong><span style="color: Tomato;">&gt;</span></strong> <strong>6 │ </strong> emit('increment', count) <strong> │ </strong> <strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>7 │ </strong> &#125; <strong>8 │ </strong>&#125; <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Without </span><span style="color: lightgreen;"><strong>&#96;.value&#96;</strong></span><span style="color: lightgreen;">, Vue cannot track changes to the ref, which may break reactivity.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>&#96;.value&#96;</strong></span><span style="color: lightgreen;"> to access ref value.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit </span><span style="color: lightgreen;"><a href="https://biomejs.dev/linter/#nursery">https://biomejs.dev/linter/#nursery</a></span><span style="color: lightgreen;"> for more information.</span> </code></pre>

Valid

js
import { ref } from "vue"

const count = ref(0)
count.value++
js
import { ref } from "vue"

const ok = ref(true)
const msg = ok.value ? "yes" : "no"
if (ok.value) {
  //
}
js
import { ref } from "vue"

export default {
  setup(_props, { emit }) {
    const count = ref(0)
    emit('increment', count.value)
  }
}
</TabItem> </Tabs>