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rsnext/errors/no-unwanted-polyfillio.md
Houssein Djirdeh e783b0a2e8
Adds ESLint with default rule-set (#23702) 
This PR re-includes ESLint with some notable changes, namely a guided setup similar to how TypeScript is instantiated in a Next.js application.

To add ESLint to a project, developers will have to create an `.eslintrc` file in the root of their project or add an empty `eslintConfig` object to their `package.json` file.

```js
touch .eslintrc
```

Then running `next build` will show instructions to install the required packages needed:

<img width="862" alt="Screen Shot 2021-04-19 at 7 38 27 PM" src="https://user-images.githubusercontent.com/12476932/115316182-dfd51b00-a146-11eb-830c-90bad20ed151.png">

Once installed and `next build` is run again, `.eslintrc` will be automatically configured to include the default config:

```json
{
  "extends": "next"
}
```

In addition to this change:

- The feature is now under the experimental flag and requires opt-in. After testing and feedback, it will be switched to the top-level namespace and turned on by default.
- A new ESLint shareable configuration package is included that can be extended in any application with `{ extends: 'next' }`
  - This default config extends recommended rule sets from [`eslint-plugin-react`](https://www.npmjs.com/package/eslint-plugin-react), [`eslint-plugin-react-hooks`](https://www.npmjs.com/package/eslint-plugin-react-hooks), and [`eslint-plugin-next`](https://www.npmjs.com/package/@next/eslint-plugin-next)
- All rules in [`eslint-plugin-next`](https://www.npmjs.com/package/@next/eslint-plugin-next) have been modified to include actionable links that show more information to help resolve each issue
2021-04-30 11:09:07 +00:00

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Duplicate Polyfills from Polyfill.io

Why This Error Occurred

You are using Polyfill.io and including duplicate polyfills already shipped with Next.js. This increases page weight unnecessarily which can affect loading performance.

Possible Ways to Fix It

Remove all duplicate polyfills that are included with Polyfill.io. If you need to add polyfills but are not sure if Next.js already includes it, take a look at the list of supported browsers and features first.

Useful Links