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What is the difference between Babel polyfills and shims?

An example of an AI chatbot conversation about Babel polyfills and shims.

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You

What is the difference between Babel polyfills and shims?

MagicBuddy
MagicBuddy

Babel polyfills are used to add new JavaScript features to older environments, while shims provide compatibility for existing features.

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You

Can you give me an example of when to use a polyfill?

MagicBuddy
MagicBuddy

Sure! If you're using Promise in your code, you would use a polyfill to ensure it works in browsers that don't support it natively.

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You

And what about shims? When should I use them?

MagicBuddy
MagicBuddy

Shims are useful when you want to modify existing JavaScript features to behave differently, like changing the behavior of Array.prototype.map.

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You

Are there any performance implications of using polyfills or shims?

MagicBuddy
MagicBuddy

Yes, using polyfills can increase the size of your JavaScript bundle, which may affect load times. Shims can also add overhead if they modify existing methods.

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