next/dist/esm/shared/lib/lazy-dynamic/preload-chunks.js

The React Framework

'use client';
import { jsx as _jsx, Fragment as _Fragment } from "react/jsx-runtime";
import { preload } from 'react-dom';
import { workAsyncStorage } from '../../../server/app-render/work-async-storage.external';
import { encodeURIPath } from '../encode-uri-path';
export function PreloadChunks(param) {
    let { moduleIds } = param;
    // 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 /*#__PURE__*/ _jsx(_Fragment, {
        children: 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 /*#__PURE__*/ _jsx("link", {
                    // @ts-ignore
                    precedence: "dynamic",
                    href: href,
                    rel: "stylesheet",
                    as: "style"
                }, chunk);
            } 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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