Fixing the asChild Prop Issue in Astro with shadcn/ui

When integrating shadcn/ui components with Astro, you might encounter issues with the asChild prop not working as expected. This is a common problem that occurs due to how Astro handles React components and prop forwarding.

The Problem

When using shadcn/ui components like PopoverTrigger with the asChild prop in Astro, you might find that the prop doesn’t work as intended.

<PopoverTrigger asChild>
    <Button
        variant="outline"
        role="combobox"
        aria-expanded={open}
        className="capitalize justify-between"
    >
        {value
            ? frameworks.find((framework) => framework.value === value)?.label
            : `${title}`}
        <ChevronsUpDown className="opacity-50" />
    </Button>
</PopoverTrigger>

Why This Happens

I guess it happens because Astro inserts its own nodes while rendering nested components, and the button passes its props to a temporary child.

The Solution

Instead of relying on the asChild prop, you can directly apply the button styling to the PopoverTrigger component:

<PopoverTrigger className={cn(buttonVariants({ variant: "outline" }))}>
    {value
        ? frameworks.find((framework) => framework.value === value)?.label
        : `${title}`}
    <ChevronsUpDown className="size-4 opacity-50" />
</PopoverTrigger>

What’s Different

1. Removed asChild prop: We eliminate the problematic prop entirely
2. Direct styling: Apply button variants directly to the PopoverTrigger
3. Maintained functionality: All the original functionality remains intact

Complete Working Example

Here’s a complete example of a working Combobox component in Astro:

import { useState } from "react"
import { cn } from "@/lib/utils"
import { buttonVariants } from "@/components/ui/button"
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from "@/components/ui/popover"
import { ChevronsUpDown, Check } from "lucide-react"

const frameworks = [
  { value: "next.js", label: "Next.js" },
  { value: "sveltekit", label: "SvelteKit" },
  { value: "nuxt.js", label: "Nuxt.js" },
  { value: "remix", label: "Remix" },
  { value: "astro", label: "Astro" },
]

export default function ComboboxDemo({ title = "Select framework..." }) {
  const [open, setOpen] = useState(false)
  const [value, setValue] = useState("")

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger 
        className={cn(
          buttonVariants({ variant: "outline" }), 
          "capitalize justify-between"
        )}
        role="combobox"
        aria-expanded={open}
      >
        {value
          ? frameworks.find((framework) => framework.value === value)?.label
          : title}
        <ChevronsUpDown className="size-4 opacity-50" />
      </PopoverTrigger>
      <PopoverContent className="w-[200px] p-0">
        {/* Your popover content here */}
      </PopoverContent>
    </Popover>
  )
}