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noCompareNegZero

src/content/docs/linter/rules/no-compare-neg-zero.mdx

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

<Tabs> <TabItem label="JavaScript (and super languages)" icon="seti:javascript"> ## Summary - Rule available since: `v1.0.0` - Diagnostic Category: [`lint/suspicious/noCompareNegZero`](/reference/diagnostics#diagnostic-category) - This rule is **recommended**, meaning it is enabled by default. - This rule has a [**safe**](/linter/#safe-fixes) fix. - The default severity of this rule is [**error**](/reference/diagnostics#error). - Sources: - Same as [`no-compare-neg-zero`](https://eslint.org/docs/latest/rules/no-compare-neg-zero)

How to configure

json
{
	"linter": {
		"rules": {
			"suspicious": {
				"noCompareNegZero": "error"
			}
		}
	}
}

Description

Disallow comparing against -0

Examples

Invalid

js
(1 >= -0)
<pre class="language-text"><code class="language-text">code-block.js:1:2 <a href="https://biomejs.dev/linter/rules/no-compare-neg-zero">lint/suspicious/noCompareNegZero</a> <span style="color: #000; background-color: #ddd;"> FIXABLE </span> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Do not use the &gt;= operator to compare against -0.</span> <strong><span style="color: Tomato;">&gt;</span></strong> <strong>1 │ </strong>(1 &gt;= -0) <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>2 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Safe fix</span><span style="color: lightgreen;">: </span><span style="color: lightgreen;">Replace -0 with 0</span> <strong> 1 │ </strong>(1<span style="opacity: 0.8;">·</span>&gt;=<span style="opacity: 0.8;">·</span><span style="color: Tomato;">-</span>0) <strong> │ </strong> <span style="color: Tomato;">-</span> </code></pre>

Valid

js
(1 >= 0)
</TabItem> </Tabs>