next/dist/esm/server/app-render/turbopack-bootstrap-script.js

The React Framework

import { htmlEscapeAttributeString, htmlEscapeJsonString } from '../../shared/lib/htmlescape';
import { getTurbopackChunkGroupBootstrap } from '../get-page-files';
import { streamFromString } from '../stream-utils/node-web-streams-helper';
/**
 * Renders the Turbopack chunk-group bootstrap (see
 * `getTurbopackChunkGroupBootstrap`) as an inline `<script>` tag.
 *
 * Under Cache Components, a static shell is prerendered without a request, so
 * it can never carry the per-request CSP nonce. A static shell that is resumed
 * therefore leaves the bootstrap out, and the per-request resume emits it with
 * this helper instead, so that a nonce-based CSP allows it. The resume can't
 * add it to the shell, since on Vercel the shell is served before any Next.js
 * code runs. The shared runtime picks up a bootstrap pushed after it has
 * loaded: once it runs it replaces the queue with `{ push: registerChunk }`.
 * The entry's runtime modules can then be instantiated from within this inline
 * script, so they mustn't depend on `document.currentScript` being one of the
 * chunk scripts (see `appBootstrap`).
 */ export function getTurbopackBootstrapScriptTag(scriptContent, nonce) {
    const startScriptTag = nonce ? `<script nonce="${htmlEscapeAttributeString(nonce)}">` : '<script>';
    // The bootstrap is `globalThis[<JSON string>].push(<JSON params>)`: the only
    // characters that need escaping can only appear inside its JSON string
    // literals, where the `\uXXXX` escapes keep their value.
    return `${startScriptTag}${htmlEscapeJsonString(scriptContent)}</script>`;
}
export function createTurbopackBootstrapScriptStream(scriptContent, nonce) {
    return streamFromString(getTurbopackBootstrapScriptTag(scriptContent, nonce));
}
/**
 * The Turbopack bootstrap script for `page`, for serving a Cache Components
 * static shell on its own, without the resume that would otherwise emit it.
 * Returns undefined when the build doesn't inline a bootstrap for the page.
 */ export function createTurbopackBootstrapScriptStreamForPage(buildManifest, page, nonce) {
    if (!buildManifest.pagesChunkGroupBootstrapParams || !buildManifest.chunkLoadingGlobal) {
        return undefined;
    }
    const scriptContent = getTurbopackChunkGroupBootstrap(buildManifest.pagesChunkGroupBootstrapParams, buildManifest.chunkLoadingGlobal, [
        page
    ]);
    return scriptContent ? createTurbopackBootstrapScriptStream(scriptContent, nonce) : undefined;
}

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