festa/components/postcard/Postcard.tsx

import { useEffect } from "react"
import { PostcardContext } from "./PostcardContext"
import { useDefinedContext } from "../../utils/definedContext"
import { StaticImageData } from "next/image"

type PostcardProps = {
    src?: string | StaticImageData
}

export function Postcard({ src }: PostcardProps) {
    const { setPostcard } = useDefinedContext(PostcardContext)

    useEffect(
        () => {
            if (src) {
                if (src === undefined) {
                    return
                }
                if (typeof src === "object") {
                    setPostcard(src.src)
                }
                else {
                    setPostcard(src)
                }
            }
        },
        [src, setPostcard]
    )

    return null
}