21 lines
1.0 KiB
Markdown
21 lines
1.0 KiB
Markdown
---
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layout: docs
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title: FAQ
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description: Frequently Asked Questions and Answers
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permalink: /docs/faq/
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---
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## Why are there `Array.from` and `Object.assign` calls in my code?! These functions don't exist!
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This is a known [caveat](/docs/caveats). This is because 6to5 compiles to ES3 syntax but with
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ES5 and ES6 methods. This is essential to emulate a complete ES6 environment so your code
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wont break! You see, ES6 features such as [iterators](/docs/tour#iterators) and
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[symbols](/docs/tour#symbols) require a lot of logic to work, and to accurately support these
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it would mean **a lot** of boilerplate smoshed into your codebase. This is the approach taken
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by other transpilers but 6to5 approaches it quite differently.
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You have two options, depending on your use case:
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- Use the wonderful [core aliasing optional transformer](/docs/usage/transformers#core-aliasing). This is recommended if you're writing a library.
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- Or use the bundled 6to5 [polyfill](/docs/usage/polyfill). This is recommended if you're writing an entire application.
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