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'use client'
import { preload } from 'react-dom'
import { workAsyncStorage } from '../../../server/app-render/work-async-storage.external'
import { encodeURIPath } from '../encode-uri-path'
export function PreloadChunks({
moduleIds,
}: {
moduleIds: string[] | undefined
}) {
// Early return in client compilation and only load requestStore on server side
if (typeof window !== 'undefined') {
return null
}
const workStore = workAsyncStorage.getStore()
if (workStore === undefined) {
return null
}
const allFiles = []
// Search the current dynamic call unique key id in react loadable manifest,
// and find the corresponding CSS files to preload
if (workStore.reactLoadableManifest && moduleIds) {
const manifest = workStore.reactLoadableManifest
for (const key of moduleIds) {
if (!manifest[key]) continue
const chunks = manifest[key].files
allFiles.push(...chunks)
}
}
if (allFiles.length === 0) {
return null
}
const dplId = process.env.NEXT_DEPLOYMENT_ID
? `?dpl=${process.env.NEXT_DEPLOYMENT_ID}`
: ''
return (
<>
{allFiles.map((chunk) => {
const href = `${workStore.assetPrefix}/_next/${encodeURIPath(chunk)}${dplId}`
const isCss = chunk.endsWith('.css')
// If it's stylesheet we use `precedence` o help hoist with React Float.
// For stylesheets we actually need to render the CSS because nothing else is going to do it so it needs to be part of the component tree.
// The `preload` for stylesheet is not optional.
if (isCss) {
return (
<link
key={chunk}
// @ts-ignore
precedence="dynamic"
href={href}
rel="stylesheet"
as="style"
/>
)
} else {
// If it's script we use ReactDOM.preload to preload the resources
preload(href, {
as: 'script',
fetchPriority: 'low',
})
return null
}
})}
</>
)
}
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