fix: add link rel=preload for exported sites

test/apps/export-webpack/src/client.js

@@ -0,0 +1,9 @@
+import * as sapper from '@sapper/app';
+
+window.start = () => sapper.start({
+	target: document.querySelector('#sapper')
+});
+
+window.prefetchRoutes = () => sapper.prefetchRoutes();
+window.prefetch = href => sapper.prefetch(href);
+window.goto = href => sapper.goto(href);

test/apps/export-webpack/src/routes/_error.svelte

@@ -0,0 +1,3 @@
+<h1>{status}</h1>
+
+<p>{error.message}</p>

test/apps/export-webpack/src/routes/blog/[slug].html

@@ -0,0 +1,13 @@
+<script context="module">
+	export function preload({ params }) {
+		return this.fetch(`blog/${params.slug}.json`).then(r => r.json()).then(post => {
+			return { post };
+		});
+	}
+</script>
+
+<script>
+	export let post;
+</script>
+
+<h1>{post.title}</h1>

test/apps/export-webpack/src/routes/blog/[slug].json.js

@@ -0,0 +1,19 @@
+import posts from './_posts.js';
+
+export function get(req, res) {
+	const post = posts.find(post => post.slug === req.params.slug);
+
+	if (post) {
+		res.writeHead(200, {
+			'Content-Type': 'application/json'
+		});
+
+		res.end(JSON.stringify(post));
+	} else {
+		res.writeHead(404, {
+			'Content-Type': 'application/json'
+		});
+
+		res.end(JSON.stringify({ message: 'not found' }));
+	}
+}

test/apps/export-webpack/src/routes/blog/_posts.js

@@ -0,0 +1,5 @@
+export default [
+	{ slug: 'foo', title: 'once upon a foo' },
+	{ slug: 'bar', title: 'a bar is born' },
+	{ slug: 'baz', title: 'bazzily ever after' }
+];

test/apps/export-webpack/src/routes/blog/index.html

@@ -0,0 +1,17 @@
+<script context="module">
+	export function preload() {
+		return this.fetch('blog.json').then(r => r.json()).then(posts => {
+			return { posts };
+		});
+	}
+</script>
+
+<script>
+	export let posts;
+</script>
+
+<h1>blog</h1>
+
+{#each posts as post}
+	<p><a href="blog/{post.slug}">{post.title}</a></p>
+{/each}

test/apps/export-webpack/src/routes/blog/index.json.js

@@ -0,0 +1,9 @@
+import posts from './_posts.js';
+
+export function get(req, res) {
+	res.writeHead(200, {
+		'Content-Type': 'application/json'
+	});
+
+	res.end(JSON.stringify(posts));
+}

test/apps/export-webpack/src/routes/index.svelte

@@ -0,0 +1,4 @@
+<h1>Great success!</h1>
+
+<a href="blog">blog</a>
+<a href="">empty anchor</a>

test/apps/export-webpack/src/server.js

@@ -0,0 +1,15 @@
+import sirv from 'sirv';
+import polka from 'polka';
+import * as sapper from '@sapper/server';
+
+const { PORT, NODE_ENV } = process.env;
+const dev = NODE_ENV === 'development';
+
+polka()
+	.use(
+		sirv('static', { dev }),
+		sapper.middleware()
+	)
+	.listen(PORT, err => {
+		if (err) console.log('error', err);
+	});

test/apps/export-webpack/src/service-worker.js

@@ -0,0 +1,82 @@
+import * as sapper from '@sapper/service-worker';
+
+const ASSETS = `cache${sapper.timestamp}`;
+
+// `shell` is an array of all the files generated by webpack,
+// `files` is an array of everything in the `static` directory
+const to_cache = sapper.shell.concat(sapper.files);
+const cached = new Set(to_cache);
+
+self.addEventListener('install', event => {
+	event.waitUntil(
+		caches
+			.open(ASSETS)
+			.then(cache => cache.addAll(to_cache))
+			.then(() => {
+				self.skipWaiting();
+			})
+	);
+});
+
+self.addEventListener('activate', event => {
+	event.waitUntil(
+		caches.keys().then(async keys => {
+			// delete old caches
+			for (const key of keys) {
+				if (key !== ASSETS) await caches.delete(key);
+			}
+
+			self.clients.claim();
+		})
+	);
+});
+
+self.addEventListener('fetch', event => {
+	if (event.request.method !== 'GET') return;
+
+	const url = new URL(event.request.url);
+
+	// don't try to handle e.g. data: URIs
+	if (!url.protocol.startsWith('http')) return;
+
+	// ignore dev server requests
+	if (url.hostname === self.location.hostname && url.port !== self.location.port) return;
+
+	// always serve assets and webpack-generated files from cache
+	if (url.host === self.location.host && cached.has(url.pathname)) {
+		event.respondWith(caches.match(event.request));
+		return;
+	}
+
+	// for pages, you might want to serve a shell `index.html` file,
+	// which Sapper has generated for you. It's not right for every
+	// app, but if it's right for yours then uncomment this section
+	/*
+	if (url.origin === self.origin && routes.find(route => route.pattern.test(url.pathname))) {
+		event.respondWith(caches.match('/index.html'));
+		return;
+	}
+	*/
+
+	if (event.request.cache === 'only-if-cached') return;
+
+	// for everything else, try the network first, falling back to
+	// cache if the user is offline. (If the pages never change, you
+	// might prefer a cache-first approach to a network-first one.)
+	event.respondWith(
+		caches
+			.open(`offline${sapper.timestamp}`)
+			.then(async cache => {
+				try {
+					const response = await fetch(event.request);
+					cache.put(event.request, response.clone());
+					return response;
+				} catch(err) {
+					const response = await cache.match(event.request);
+					if (response) return response;
+
+					throw err;
+				}
+			})
+	);
+});

test/apps/export-webpack/src/template.html

@@ -0,0 +1,14 @@
+<!doctype html>
+<html lang="en">
+<head>
+	<meta charset='utf-8'>
+
+	%sapper.base%
+	%sapper.styles%
+	%sapper.head%
+</head>
+<body>
+	<div id='sapper'>%sapper.html%</div>
+	%sapper.scripts%
+</body>
+</html>