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type OgModule = typeof import('next/dist/compiled/@vercel/og')
function importModule(): Promise<
typeof import('next/dist/compiled/@vercel/og')
> {
return import(
process.env.NEXT_RUNTIME === 'edge'
? 'next/dist/compiled/@vercel/og/index.edge.js'
: 'next/dist/compiled/@vercel/og/index.node.js'
)
}
/**
* The ImageResponse class allows you to generate dynamic images using JSX and CSS.
* This is useful for generating social media images such as Open Graph images, Twitter cards, and more.
*
* Read more: [Next.js Docs: `ImageResponse`](https://nextjs.org/docs/app/api-reference/functions/image-response)
*/
export class ImageResponse extends Response {
public static displayName = 'ImageResponse'
constructor(...args: ConstructorParameters<OgModule['ImageResponse']>) {
const readable = new ReadableStream({
async start(controller) {
const OGImageResponse: typeof import('next/dist/compiled/@vercel/og').ImageResponse =
// So far we have to manually determine which build to use,
// as the auto resolving is not working
(await importModule()).ImageResponse
const imageResponse = new OGImageResponse(...args) as Response
if (!imageResponse.body) {
return controller.close()
}
const reader = imageResponse.body!.getReader()
while (true) {
const { done, value } = await reader.read()
if (done) {
return controller.close()
}
controller.enqueue(value)
}
},
})
const options = args[1] || {}
const headers = new Headers({
'content-type': 'image/png',
'cache-control':
process.env.NODE_ENV === 'development'
? 'no-cache, no-store'
: 'public, immutable, no-transform, max-age=31536000',
})
if (options.headers) {
const newHeaders = new Headers(options.headers)
newHeaders.forEach((value, key) => headers.set(key, value))
}
super(readable, {
headers,
status: options.status,
statusText: options.statusText,
})
}
}
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