nextjs/no-unwanted-polyfillio Correctness

What it does

Prevent duplicate polyfills from Polyfill.io.

Why is this bad?

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

Example

<script src='https://polyfill.io/v3/polyfill.min.js?features=Array.prototype.copyWithin'></script>

<script src='https://polyfill.io/v3/polyfill.min.js?features=WeakSet%2CPromise%2CPromise.prototype.finally%2Ces2015%2Ces5%2Ces6'></script>

References

• Rule Source