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noInvalidConstructorSuper

src/content/docs/linter/rules/no-invalid-constructor-super.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/correctness/noInvalidConstructorSuper`](/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 [`constructor-super`](https://eslint.org/docs/latest/rules/constructor-super)

How to configure

json
{
	"linter": {
		"rules": {
			"correctness": {
				"noInvalidConstructorSuper": "error"
			}
		}
	}
}

Description

Prevents the incorrect use of super() inside classes. It also checks whether a call super() is missing from classes that extends other constructors.

Examples

Invalid

js
class A {
    constructor() {
        super();
    }
}
<pre class="language-text"><code class="language-text">code-block.js:3:9 <a href="https://biomejs.dev/linter/rules/no-invalid-constructor-super">lint/correctness/noInvalidConstructorSuper</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">This class should not have a </span><span style="color: Tomato;"><strong>super()</strong></span><span style="color: Tomato;"> call. You should remove it.</span> <strong>1 │ </strong>class A &#123; <strong>2 │ </strong> constructor() &#123; <strong><span style="color: Tomato;">&gt;</span></strong> <strong>3 │ </strong> super(); <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>4 │ </strong> &#125; <strong>5 │ </strong>&#125; </code></pre>
js
class A extends undefined {
    constructor() {
        super();
    }
}
<pre class="language-text"><code class="language-text">code-block.js:3:9 <a href="https://biomejs.dev/linter/rules/no-invalid-constructor-super">lint/correctness/noInvalidConstructorSuper</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">This class calls </span><span style="color: Tomato;"><strong>super()</strong></span><span style="color: Tomato;">, but the class extends from a non-constructor.</span> <strong>1 │ </strong>class A extends undefined &#123; <strong>2 │ </strong> constructor() &#123; <strong><span style="color: Tomato;">&gt;</span></strong> <strong>3 │ </strong> super(); <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>4 │ </strong> &#125; <strong>5 │ </strong>&#125; <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">This is where the non-constructor is used.</span> <strong><span style="color: Tomato;">&gt;</span></strong> <strong>1 │ </strong>class A extends undefined &#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>2 │ </strong> constructor() &#123; <strong>3 │ </strong> super(); </code></pre>

Valid

js
export default class A extends B {
    constructor() {
        super();
    }
}
js
export class A {
    constructor() {}
}
</TabItem> </Tabs>