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noDuplicateJsxProps

src/content/docs/linter/rules/no-duplicate-jsx-props.mdx

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Original Source

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

<Tabs> <TabItem label="JSX and TSX" icon="seti:javascript"> ## Summary - Rule available since: `v1.0.0` - Diagnostic Category: [`lint/suspicious/noDuplicateJsxProps`](/reference/diagnostics#diagnostic-category) - This rule is **recommended**, meaning it is enabled by default. - This rule doesn't have a fix. - The default severity of this rule is [**error**](/reference/diagnostics#error). - Sources: - Same as [`react/jsx-no-duplicate-props`](https://github.com/jsx-eslint/eslint-plugin-react/blob/master/docs/rules/jsx-no-duplicate-props.md)

How to configure

json

{
	"linter": {
		"rules": {
			"suspicious": {
				"noDuplicateJsxProps": "error"
			}
		}
	}
}

Description

Prevents JSX properties to be assigned multiple times.

Examples

Invalid

jsx

<Hello name="John" name="John" />

<pre class="language-text"><code class="language-text">code-block.jsx:1:8 <a href="https://biomejs.dev/linter/rules/no-duplicate-jsx-props">lint/suspicious/noDuplicateJsxProps</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">This JSX property is assigned multiple times.</span> <strong><span style="color: Tomato;">></span></strong> <strong>1 │ </strong><Hello name="John" name="John" /> <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>2 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">This attribute is assigned again here.</span> <strong><span style="color: Tomato;">></span></strong> <strong>1 │ </strong><Hello name="John" name="John" /> <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>2 │ </strong> </code></pre>

jsx

<label xml:lang="en-US" xml:lang="en-US"></label>

<pre class="language-text"><code class="language-text">code-block.jsx:1:8 <a href="https://biomejs.dev/linter/rules/no-duplicate-jsx-props">lint/suspicious/noDuplicateJsxProps</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">This JSX property is assigned multiple times.</span> <strong><span style="color: Tomato;">></span></strong> <strong>1 │ </strong><label xml:lang="en-US" xml:lang="en-US"></label> <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>2 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">This attribute is assigned again here.</span> <strong><span style="color: Tomato;">></span></strong> <strong>1 │ </strong><label xml:lang="en-US" xml:lang="en-US"></label> <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>2 │ </strong> </code></pre>

Valid

jsx

<Hello firstname="John" lastname="Doe" />

jsx

<label xml:lang="en-US" lang="en-US"></label>

</TabItem> </Tabs>