Function prerender

packages/kit/src/core/postbuild/prerender.js:37–568

* @param {{ * hash: boolean; * out: string; * manifest_path: string; * metadata: import('types').ServerMetadata; * verbose: boolean; * env: Record * }} opts

({ hash, out, manifest_path, metadata, verbose, env })

 * }} opts
 */
async function prerender({ hash, out, manifest_path, metadata, verbose, env }) {
	/** @type {import('@sveltejs/kit').SSRManifest} */
	const manifest = (await import(pathToFileURL(manifest_path).href)).manifest;

	/** @type {import('types').ServerInternalModule} */
	const internal = await import(pathToFileURL(`${out}/server/internal.js`).href);

	/** @type {import('types').ServerModule} */
	const { Server } = await import(pathToFileURL(`${out}/server/index.js`).href);

	// configure `import { building } from '$app/environment'` —
	// essential we do this before analysing the code
	internal.set_building();
	internal.set_prerendering();

	/**
	 * @template {{message: string}} T
	 * @template {Omit<T, 'message'>} K
	 * @param {import('types').Logger} log
	 * @param {'fail' | 'warn' | 'ignore' | ((details: T) => void)} input
	 * @param {(details: K) => string} format
	 * @returns {(details: K) => void}
	 */
	function normalise_error_handler(log, input, format) {
		switch (input) {
			case 'fail':
				return (details) => {
					throw new Error(format(details));
				};
			case 'warn':
				return (details) => {
					log.error(format(details));
				};
			case 'ignore':
				return () => {};
			default:
				// @ts-expect-error TS thinks T might be of a different kind, but it's not
				return (details) => input({ ...details, message: format(details) });
		}
	}

	const OK = 2;
	const REDIRECT = 3;

	/** @type {import('types').Prerendered} */
	const prerendered = {
		pages: new Map(),
		assets: new Map(),
		redirects: new Map(),
		paths: []
	};

	/** @type {import('types').PrerenderMap} */
	const prerender_map = new Map();

	for (const [id, { prerender }] of metadata.routes) {
		if (prerender !== undefined) {
			prerender_map.set(id, prerender);