noExportedImports

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

<Tabs> <TabItem label="JavaScript (and super languages)" icon="seti:javascript"> ## Summary - Rule available since: `v1.9.0` - Diagnostic Category: [`lint/style/noExportedImports`](/reference/diagnostics#diagnostic-category) - This rule isn't recommended, so you need to enable it. - This rule doesn't have a fix. - The default severity of this rule is [**information**](/reference/diagnostics#information). ## How to configure ```json title="biome.json" { "linter": { "rules": { "style": { "noExportedImports": "error" } } } }

## Description
Disallow exporting an imported variable.

In JavaScript, you can re-export a variable either by using `export from` or
by first importing the variable and then exporting it with a regular `export`.

You may prefer to use the first approach, as it clearly communicates the intention
to re-export an import, and can make static analysis easier.

## Examples

### Invalid

```js
import { A } from "mod";
export { A };

<pre class="language-text"><code class="language-text">code-block.js:1:10 <a href="https://biomejs.dev/linter/rules/no-exported-imports">lint/style/noExportedImports</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ℹ An import should not be exported. Use export from instead. > 1 │ import { A } from "mod"; │ ^ 2 │ export { A }; 3 │ ℹ export from makes it clearer that the intention is to re-export a variable. </code></pre>

import * as ns from "mod";
export { ns };

<pre class="language-text"><code class="language-text">code-block.js:1:8 <a href="https://biomejs.dev/linter/rules/no-exported-imports">lint/style/noExportedImports</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ℹ An import should not be exported. Use export from instead. > 1 │ import * as ns from "mod"; │ ^^^^^^^ 2 │ export { ns }; 3 │ ℹ export from makes it clearer that the intention is to re-export a variable. </code></pre>

import D from "mod";
export { D };

<pre class="language-text"><code class="language-text">code-block.js:1:8 <a href="https://biomejs.dev/linter/rules/no-exported-imports">lint/style/noExportedImports</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ℹ An import should not be exported. Use export from instead. > 1 │ import D from "mod"; │ ^ 2 │ export { D }; 3 │ ℹ export from makes it clearer that the intention is to re-export a variable. </code></pre>

Valid

export { A } from "mod";
export * as ns from "mod";
export { default as D } from "mod";

</TabItem> </Tabs>

Valid

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