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Q:

What are the approaches to include polyfills in your create-react-app?

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  1. Manual import from core-js:

    Create a file called (something like) polyfills.js and import it into root index.js file. Run npm install core-js or yarn add core-js and import your specific required features.

    import 'core-js/fn/array/find'
    import 'core-js/fn/array/includes'
    import 'core-js/fn/number/is-nan'
  2. Using Polyfill service:

    Use the polyfill.io CDN to retrieve custom, browser-specific polyfills by adding this line to index.html:

    In the above script we had to explicitly request the Array.prototype.includes feature as it is not included in the default feature set.

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