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noDuplicateVariableNames

src/content/docs/linter/rules/no-duplicate-variable-names.mdx

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

<Tabs> <TabItem label="GraphQL" icon="seti:graphql"> :::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: `v2.3.11` - Diagnostic Category: [`lint/nursery/noDuplicateVariableNames`](/reference/diagnostics#diagnostic-category) - This rule doesn't have a fix. - The default severity of this rule is [**information**](/reference/diagnostics#information). - Sources: - Same as [`@graphql-eslint/unique-variable-names`](https://the-guild.dev/graphql/eslint/rules/unique-variable-names)

How to configure

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

Description

Require all variable definitions to be unique.

A GraphQL operation is only valid if all its variables are uniquely named.

Examples

Invalid

graphql
query ($x: Int, $x: Int) {
  field
}
<pre class="language-text"><code class="language-text">code-block.graphql:1:7 <a href="https://biomejs.dev/linter/rules/no-duplicate-variable-names">lint/nursery/noDuplicateVariableNames</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Duplicate variable name.</span> <strong><span style="color: Tomato;">&gt;</span></strong> <strong>1 │ </strong>query ($x: Int, $x: Int) &#123; <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><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><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><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>2 │ </strong> field <strong>3 │ </strong>&#125; <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">A GraphQL operation is only valid if all its variables are uniquely named. Make sure to name every variable differently.</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

graphql
query ($x: Int, $y: Int) {
  field
}
</TabItem> </Tabs>