chakra-ui/apps/www/content/docs/components/concepts/composition.mdx

---
title: Composition
description: Learn how to compose components in Chakra UI.
---

## The `as` Prop

Used to change the underlying HTML element that a React component renders. It
provides a straightforward way to change the underlying element while retaining
the component's functionality.

```jsx
<Heading as="h3">Hello, world!</Heading>
```

:::warning

**TypeScript:** The caveat with the `as` prop is that the types of the component
passed to the `as` prop must be compatible with the component's props. We do not
infer the underlying component's props from the `as` prop.

:::

## The `asChild` Prop

Used to compose a component's functionality onto its child element. This
approach, inspired by
[Radix UI](https://www.radix-ui.com/primitives/docs/utilities/slot), offers
maximum flexibility.

```jsx
<Popover.Root>
  <Popover.Trigger asChild>
    <Button>Open</Button>
  </Popover.Trigger>
</Popover.Root>
```

In this example, the `asChild` prop allows the `Button` to be used as the
trigger for the popover.

## Best Practices

To avoid common pitfalls when using the `as` and `asChild` props, there are a
few best practices to consider:

- **Forward Refs:** Ensure that the underlying component forwards the ref passed
  to it properly.
- **Spread Props:** Ensure that the underlying component spreads the props
  passed to it.

```jsx
const MyComponent = React.forwardRef((props, ref) => {
  return <Box ref={ref} {...props} />
})

// with `as` prop
<MyComponent as="button" />

// with `asChild` prop
<Button asChild>
  <MyComponent> Click me </MyComponent>
</Button>
```