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import type { CssResource } from '../../build/webpack/plugins/flight-manifest-plugin'
import { encodeURIPath } from '../../shared/lib/encode-uri-path'
import type { AppRenderContext } from './app-render'
import { getAssetQueryString } from './get-asset-query-string'
import type { PreloadCallbacks } from './types'
/**
* Abstracts the rendering of CSS files based on whether they are inlined or not.
* For inlined CSS, renders a <style> tag with the CSS content directly embedded.
* For external CSS files, renders a <link> tag pointing to the CSS file.
*/
export function renderCssResource(
entryCssFiles: CssResource[],
ctx: AppRenderContext,
preloadCallbacks?: PreloadCallbacks
) {
return entryCssFiles.map((entryCssFile, index) => {
// `Precedence` is an opt-in signal for React to handle resource
// loading and deduplication, etc. It's also used as the key to sort
// resources so they will be injected in the correct order.
// During HMR, it's critical to use different `precedence` values
// for different stylesheets, so their order will be kept.
// https://github.com/facebook/react/pull/25060
const precedence =
process.env.NODE_ENV === 'development'
? 'next_' + entryCssFile.path
: 'next'
// In dev, Safari and Firefox will cache the resource during HMR:
// - https://github.com/vercel/next.js/issues/5860
// - https://bugs.webkit.org/show_bug.cgi?id=187726
// Because of this, we add a `?v=` query to bypass the cache during
// development. We need to also make sure that the number is always
// increasing.
const fullHref = `${ctx.assetPrefix}/_next/${encodeURIPath(
entryCssFile.path
)}${getAssetQueryString(ctx, true)}`
if (entryCssFile.inlined && !ctx.parsedRequestHeaders.isRSCRequest) {
return (
<style
key={index}
nonce={ctx.nonce}
// @ts-ignore
precedence={precedence}
href={fullHref}
>
{entryCssFile.content}
</style>
)
}
preloadCallbacks?.push(() => {
ctx.componentMod.preloadStyle(
fullHref,
ctx.renderOpts.crossOrigin,
ctx.nonce
)
})
return (
<link
key={index}
rel="stylesheet"
href={fullHref}
// @ts-ignore
precedence={precedence}
crossOrigin={ctx.renderOpts.crossOrigin}
nonce={ctx.nonce}
/>
)
})
}
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