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[ESLint] Adds section to docs for migrating existing ESLint configurations #26101

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Jun 14, 2021
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15 changes: 15 additions & 0 deletions docs/basic-features/eslint.md
Original file line number Diff line number Diff line change
Expand Up @@ -148,3 +148,18 @@ A stricter `next/core-web-vitals` rule set can also be added in `.eslintrc`:
`next/core-web-vitals` updates `eslint-plugin-next` to error on a number of rules that are warnings by default if they affect [Core Web Vitals](https://web.dev/vitals/).

> Both `next` and `next/core-web-vitals` entry points are automatically included for new applications built with [Create Next App](/docs/api-reference/create-next-app.md).

## Migrating Existing Config

If you already have ESLint configured in your application, we recommend extending directly from the Next.js ESLint plugin instead of the shareable configuration.

```js
module.exports = {
extends: [
//...
'plugin:@next/next/recommended',
],
}
```

This eliminates any risk of collisions that can occur due to importing the same plugin or parser across multiple configurations.