1 files changed, 114 insertions, 0 deletions
diff --git a/node_modules/swup/src/modules/fetchPage.ts b/node_modules/swup/src/modules/fetchPage.ts
new file mode 100644
index 00000000..96275448
--- /dev/null
+++ b/node_modules/swup/src/modules/fetchPage.ts
@@ -0,0 +1,114 @@
+import type Swup from '../Swup.js';
+import { Location } from '../helpers.js';
+import type { Visit } from './Visit.js';
+
+/** A page object as used by swup and its cache. */
+export interface PageData {
+	/** The URL of the page */
+	url: string;
+	/** The complete HTML response received from the server */
+	html: string;
+}
+
+/** Define how a page is fetched. */
+export interface FetchOptions extends Omit<RequestInit, 'cache'> {
+	/** The request method. */
+	method?: 'GET' | 'POST';
+	/** The body of the request: raw string, form data object or URL params. */
+	body?: string | FormData | URLSearchParams;
+	/** The request timeout in milliseconds. */
+	timeout?: number;
+	/** Optional visit object with additional context. @internal */
+	visit?: Visit;
+}
+
+export class FetchError extends Error {
+	url: string;
+	status?: number;
+	aborted: boolean;
+	timedOut: boolean;
+	constructor(
+		message: string,
+		details: { url: string; status?: number; aborted?: boolean; timedOut?: boolean }
+	) {
+		super(message);
+		this.name = 'FetchError';
+		this.url = details.url;
+		this.status = details.status;
+		this.aborted = details.aborted || false;
+		this.timedOut = details.timedOut || false;
+	}
+}
+
+/**
+ * Fetch a page from the server, return it and cache it.
+ */
+export async function fetchPage(
+	this: Swup,
+	url: URL | string,
+	options: FetchOptions = {}
+): Promise<PageData> {
+	url = Location.fromUrl(url).url;
+
+	const { visit = this.visit } = options;
+	const headers = { ...this.options.requestHeaders, ...options.headers };
+	const timeout = options.timeout ?? this.options.timeout;
+	const controller = new AbortController();
+	const { signal } = controller;
+	options = { ...options, headers, signal };
+
+	let timedOut = false;
+	let timeoutId: ReturnType<typeof setTimeout> | null = null;
+	if (timeout && timeout > 0) {
+		timeoutId = setTimeout(() => {
+			timedOut = true;
+			controller.abort('timeout');
+		}, timeout);
+	}
+
+	// Allow hooking before this and returning a custom response-like object (e.g. custom fetch implementation)
+	let response: Response;
+	try {
+		response = await this.hooks.call(
+			'fetch:request',
+			visit,
+			{ url, options },
+			(visit, { url, options }) => fetch(url, options)
+		);
+		if (timeoutId) {
+			clearTimeout(timeoutId);
+		}
+	} catch (error) {
+		if (timedOut) {
+			this.hooks.call('fetch:timeout', visit, { url });
+			throw new FetchError(`Request timed out: ${url}`, { url, timedOut });
+		}
+		if ((error as Error)?.name === 'AbortError' || signal.aborted) {
+			throw new FetchError(`Request aborted: ${url}`, { url, aborted: true });
+		}
+		throw error;
+	}
+
+	const { status, url: responseUrl } = response;
+	const html = await response.text();
+
+	if (status === 500) {
+		this.hooks.call('fetch:error', visit, { status, response, url: responseUrl });
+		throw new FetchError(`Server error: ${responseUrl}`, { status, url: responseUrl });
+	}
+
+	if (!html) {
+		throw new FetchError(`Empty response: ${responseUrl}`, { status, url: responseUrl });
+	}
+
+	// Resolve real url after potential redirect
+	const { url: finalUrl } = Location.fromUrl(responseUrl);
+	const page = { url: finalUrl, html };
+
+	// Write to cache for safe methods and non-redirects
+	if (visit.cache.write && (!options.method || options.method === 'GET') && url === finalUrl) {
+		this.cache.set(page.url, page);
+	}
+
+	return page;
+}