including-modules
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# import/enforce-node-protocol-usage
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🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
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<!-- end auto-generated rule header -->
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Enforce either using, or omitting, the `node:` protocol when importing Node.js builtin modules.
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## Rule Details
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This rule enforces that builtins node imports are using, or omitting, the `node:` protocol.
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Determining whether a specifier is a core module depends on the node version being used to run `eslint`.
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This version can be specified in the configuration with the [`import/node-version` setting](../../README.md#importnode-version).
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Reasons to prefer using the protocol include:
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- the code is more explicitly and clearly referencing a Node.js built-in module
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Reasons to prefer omitting the protocol include:
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- some tools don't support the `node:` protocol
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- the code is more portable, because import maps and automatic polyfilling can be used
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## Options
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The rule requires a single string option which may be one of:
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- `'always'` - enforces that builtins node imports are using the `node:` protocol.
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- `'never'` - enforces that builtins node imports are not using the `node:` protocol.
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## Examples
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### `'always'`
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❌ Invalid
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```js
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import fs from 'fs';
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export { promises } from 'fs';
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// require
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const fs = require('fs/promises');
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```
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✅ Valid
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```js
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import fs from 'node:fs';
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export { promises } from 'node:fs';
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import * as test from 'node:test';
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// require
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const fs = require('node:fs/promises');
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```
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### `'never'`
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❌ Invalid
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```js
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import fs from 'node:fs';
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export { promises } from 'node:fs';
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// require
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const fs = require('node:fs/promises');
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```
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✅ Valid
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```js
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import fs from 'fs';
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export { promises } from 'fs';
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// require
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const fs = require('fs/promises');
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// This rule will not enforce not using `node:` protocol when the module is only available under the `node:` protocol.
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import * as test from 'node:test';
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```
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## When Not To Use It
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If you don't want to consistently enforce using, or omitting, the `node:` protocol when importing Node.js builtin modules.
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