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no-unwanted-polyfillio.md

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Pattern: Duplicate polyfill

Issue: -

Description

Including polyfills from Polyfill.io that are already included with Next.js increases page size unnecessarily. Next.js includes common polyfills by default.

Examples

Example of incorrect code:

<Head>
  <script src="https://polyfill.io/v3/polyfill.min.js?features=Promise,es2015,es6" />
</Head>

Example of correct code:

<Head>
  <script src="https://polyfill.io/v3/polyfill.min.js?features=CustomEvent" />
</Head>