update to node stable

Provide session in layout preload

.gitignore

@@ -12,4 +12,5 @@ sapper
 runtime.js
 dist
 !rollup.config.js
-templates/*.js
+/runtime/app.mjs
+/runtime/server.mjs

.travis.yml

@@ -3,7 +3,6 @@ sudo: false
 language: node_js
 
 node_js:
-  - "6"
   - "stable"
 
 env:

CHANGELOG.md

@@ -1,5 +1,12 @@
 # sapper changelog
 
+## 0.25.0
+
+* Force refresh on `goto(current_url)` ([#484](https://github.com/sveltejs/sapper/pull/484))
+* Fix preloading navigation bug ([#532](https://github.com/sveltejs/sapper/issues/532))
+* Don't mutate opts.headers ([#528](https://github.com/sveltejs/sapper/issues/528))
+* Don't crawl hundreds of pages simultaneously ([#369](https://github.com/sveltejs/sapper/pull/369))
+
 ## 0.24.3
 
 * Add service-worker-index.html shell file for offline support ([#422](https://github.com/sveltejs/sapper/issues/422))

README.md

@@ -11,9 +11,11 @@ Sapper is a framework for building high-performance universal web apps. [Read th
 ## Get started
 
 Clone the [starter project template](https://github.com/sveltejs/sapper-template) with [degit](https://github.com/rich-harris/degit)...
+When cloning you have to choose between rollup or webpack:
 
 ```bash
-npx degit sveltejs/sapper-template my-app
+npx degit "sveltejs/sapper-template#rollup" my-app
+# or: npx degit "sveltejs/sapper-template#webpack" my-app
 ```
 
 ...then install dependencies and start the dev server...

appveyor.yml

@@ -10,7 +10,7 @@ build: off
 environment:
   matrix:
     # node.js
-    - nodejs_version: 10.5
+    - nodejs_version: 11
 
 install:
   - ps: Install-Product node $env:nodejs_version

mocha.opts

@@ -1,5 +1,4 @@
 --require source-map-support/register
---require ts-node/register
+--require sucrase/register
 --recursive
-test/unit/*/*.ts
 test/apps/*/test.ts

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sapper",
-  "version": "0.24.3",
+  "version": "0.26.0-alpha.12",
   "description": "Military-grade apps, engineered by Svelte",
   "bin": {
     "sapper": "./sapper"
@@ -11,59 +11,57 @@
     "config",
     "sapper",
     "dist/*.js",
-    "templates/*.js"
+    "runtime/*.mjs",
+    "runtime/internal"
   ],
   "directories": {
     "test": "test"
   },
   "dependencies": {
-    "html-minifier": "^3.5.20",
+    "html-minifier": "^3.5.21",
-    "shimport": "0.0.11",
+    "http-link-header": "^1.0.2",
-    "source-map-support": "^0.5.9",
+    "shimport": "0.0.14",
-    "sourcemap-codec": "^1.4.3",
+    "sourcemap-codec": "^1.4.4",
-    "string-hash": "^1.1.3",
+    "string-hash": "^1.1.3"
-    "tslib": "^1.9.3"
   },
   "devDependencies": {
-    "@types/mkdirp": "^0.5.2",
     "@types/mocha": "^5.2.5",
-    "@types/node": "^10.12.0",
+    "@types/node": "^10.12.21",
-    "@types/puppeteer": "^1.9.0",
+    "@types/puppeteer": "^1.11.3",
-    "@types/rimraf": "^2.0.2",
     "agadoo": "^1.0.1",
-    "cheap-watch": "^1.0.0",
+    "cheap-watch": "^1.0.2",
     "cookie": "^0.3.1",
-    "devalue": "^1.0.4",
+    "devalue": "^1.1.0",
-    "eslint": "^5.7.0",
+    "eslint": "^5.12.1",
-    "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-import": "^2.16.0",
-    "kleur": "^2.0.2",
+    "kleur": "^3.0.1",
-    "mkdirp": "^0.5.1",
     "mocha": "^5.2.0",
-    "node-fetch": "^2.2.0",
+    "node-fetch": "^2.3.0",
     "npm-run-all": "^4.1.5",
     "polka": "^0.5.1",
     "port-authority": "^1.0.5",
     "pretty-bytes": "^5.1.0",
-    "puppeteer": "^1.9.0",
+    "puppeteer": "^1.12.0",
     "require-relative": "^0.8.7",
-    "rimraf": "^2.6.2",
+    "rollup": "^1.1.2",
-    "rollup": "^0.66.6",
     "rollup-plugin-commonjs": "^9.2.0",
     "rollup-plugin-json": "^3.1.0",
-    "rollup-plugin-node-resolve": "^3.4.0",
+    "rollup-plugin-node-resolve": "^4.0.0",
     "rollup-plugin-replace": "^2.1.0",
     "rollup-plugin-string": "^2.0.2",
-    "rollup-plugin-svelte": "^4.3.2",
+    "rollup-plugin-sucrase": "^2.1.0",
-    "rollup-plugin-typescript": "^1.0.0",
+    "rollup-plugin-svelte": "^5.0.3",
-    "sade": "^1.4.1",
+    "sade": "^1.4.2",
-    "sander": "^0.6.0",
     "sirv": "^0.2.2",
-    "svelte": "^2.13.5",
+    "sucrase": "^3.9.5",
-    "svelte-loader": "^2.11.0",
+    "svelte": "^3.0.0-beta.11",
-    "ts-node": "^7.0.1",
+    "svelte-loader": "^2.13.3",
-    "typescript": "^3.1.3",
+    "webpack": "^4.29.0",
-    "webpack": "^4.20.2",
+    "webpack-format-messages": "^2.0.5",
-    "webpack-format-messages": "^2.0.3"
+    "yootils": "0.0.14"
+  },
+  "peerDependencies": {
+    "svelte": "^3.0.0"
   },
   "scripts": {
     "test": "mocha --opts mocha.opts",
@@ -72,7 +70,7 @@
     "prepare": "npm run build",
     "dev": "rollup -cw",
     "prepublishOnly": "npm test",
-    "update_mime_types": "curl http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types | grep -e \"^[^#]\" > templates/src/server/middleware/mime-types.md"
+    "update_mime_types": "curl http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types | grep -e \"^[^#]\" > runtime/src/server/middleware/mime-types.md"
   },
   "repository": "https://github.com/sveltejs/sapper",
   "keywords": [

rollup.config.js

@@ -1,4 +1,4 @@
-import typescript from 'rollup-plugin-typescript';
+import sucrase from 'rollup-plugin-sucrase';
 import string from 'rollup-plugin-string';
 import json from 'rollup-plugin-json';
 import resolve from 'rollup-plugin-node-resolve';
@@ -9,34 +9,37 @@ import { builtinModules } from 'module';
 const external = [].concat(
 	Object.keys(pkg.dependencies),
 	Object.keys(process.binding('natives')),
-	'sapper/core.js'
+	'sapper/core.js',
+	'svelte/compiler'
 );
 
-function template(kind, external, target) {
+function template(kind, external) {
 	return {
-		input: `templates/src/${kind}/index.ts`,
+		input: `runtime/src/${kind}/index.ts`,
 		output: {
-			file: `templates/${kind}.js`,
+			file: `runtime/${kind}.mjs`,
-			format: 'es'
+			format: 'es',
+			paths: id => id.replace('@sapper', '.')
 		},
 		external,
 		plugins: [
-			resolve(),
+			resolve({
+				extensions: ['.mjs', '.js', '.ts']
+			}),
 			commonjs(),
 			string({
 				include: '**/*.md'
 			}),
-			typescript({
+			sucrase({
-				typescript: require('typescript'),
+				transforms: ['typescript']
-				target
 			})
 		]
 	};
 }
 
 export default [
-	template('client', ['__ROOT__', '__ERROR__'], 'ES2017'),
+	template('app', id => /^(svelte\/?|@sapper\/)/.test(id)),
-	template('server', builtinModules, 'ES2015'),
+	template('server', id => /^(svelte\/?|@sapper\/)/.test(id) || builtinModules.includes(id)),
 
 	{
 		input: [
@@ -54,12 +57,13 @@ export default [
 		external,
 		plugins: [
 			json(),
-			resolve(),
+			resolve({
+				extensions: ['.mjs', '.js', '.ts']
+			}),
 			commonjs(),
-			typescript({
+			sucrase({
-				typescript: require('typescript')
+				transforms: ['typescript']
 			})
-		],
+		]
-		experimentalCodeSplitting: true
 	}
 ];

runtime/internal/Sapper.svelte

@@ -0,0 +1,12 @@
+<script>
+	import { setContext } from 'svelte';
+	import { CONTEXT_KEY } from './shared';
+
+	export let Root;
+	export let props;
+	export let session;
+
+	setContext(CONTEXT_KEY, session);
+</script>
+
+<Root {...props}/>

runtime/internal/error.svelte

@@ -0,0 +1,7 @@
+<h1>{status}</h1>
+
+<p>{error.message}</p>
+
+{#if process.env.NODE_ENV === 'development'}
+	<pre>{error.stack}</pre>
+{/if}

runtime/internal/layout.svelte

@@ -0,0 +1 @@
+<slot></slot>

runtime/internal/shared.mjs

@@ -0,0 +1,10 @@
+import { writable } from 'svelte/store';
+
+export const stores = {
+	preloading: writable(false),
+	page: writable(null)
+};
+
+export const CONTEXT_KEY = {};
+
+export const preload = () => ({});

runtime/src/app/app.ts

@@ -0,0 +1,349 @@
+import { writable } from 'svelte/store.mjs';
+import App from '@sapper/internal/App.svelte';
+import { stores } from '@sapper/internal/shared';
+import { Root, root_preload, ErrorComponent, ignore, components, routes } from '@sapper/internal/manifest-client';
+import {
+	Target,
+	ScrollPosition,
+	Component,
+	Redirect,
+	ComponentLoader,
+	ComponentConstructor,
+	Route,
+	Query,
+	Page
+} from './types';
+import goto from './goto';
+
+declare const __SAPPER__;
+export const initial_data = typeof __SAPPER__ !== 'undefined' && __SAPPER__;
+
+let ready = false;
+let root_component: Component;
+let current_token: {};
+let root_preloaded: Promise<any>;
+let current_branch = [];
+
+const session = writable(initial_data && initial_data.session);
+
+let $session;
+let session_dirty: boolean;
+
+session.subscribe(async value => {
+	$session = value;
+
+	if (!ready) return;
+	session_dirty = true;
+
+	const target = select_target(new URL(location.href));
+
+	const token = current_token = {};
+	const { redirect, props, branch } = await hydrate_target(target);
+	if (token !== current_token) return; // a secondary navigation happened while we were loading
+
+	await render(redirect, branch, props, target.page);
+});
+
+export let prefetching: {
+	href: string;
+	promise: Promise<{ redirect?: Redirect, data?: any }>;
+} = null;
+export function set_prefetching(href, promise) {
+	prefetching = { href, promise };
+}
+
+export let store;
+export function set_store(fn) {
+	store = fn(initial_data.store);
+}
+
+export let target: Node;
+export function set_target(element) {
+	target = element;
+}
+
+export let uid = 1;
+export function set_uid(n) {
+	uid = n;
+}
+
+export let cid: number;
+export function set_cid(n) {
+	cid = n;
+}
+
+const _history = typeof history !== 'undefined' ? history : {
+	pushState: (state: any, title: string, href: string) => {},
+	replaceState: (state: any, title: string, href: string) => {},
+	scrollRestoration: ''
+};
+export { _history as history };
+
+export const scroll_history: Record<string, ScrollPosition> = {};
+
+export function extract_query(search: string) {
+	const query = Object.create(null);
+	if (search.length > 0) {
+		search.slice(1).split('&').forEach(searchParam => {
+			let [, key, value] = /([^=]*)(?:=(.*))?/.exec(decodeURIComponent(searchParam));
+			value = (value || '').replace(/\+/g, ' ');
+			if (typeof query[key] === 'string') query[key] = [<string>query[key]];
+			if (typeof query[key] === 'object') (query[key] as string[]).push(value);
+			else query[key] = value;
+		});
+	}
+	return query;
+}
+
+export function select_target(url: URL): Target {
+	if (url.origin !== location.origin) return null;
+	if (!url.pathname.startsWith(initial_data.baseUrl)) return null;
+
+	const path = url.pathname.slice(initial_data.baseUrl.length);
+
+	// avoid accidental clashes between server routes and page routes
+	if (ignore.some(pattern => pattern.test(path))) return;
+
+	for (let i = 0; i < routes.length; i += 1) {
+		const route = routes[i];
+
+		const match = route.pattern.exec(path);
+
+		if (match) {
+			const query: Query = extract_query(url.search);
+			const part = route.parts[route.parts.length - 1];
+			const params = part.params ? part.params(match) : {};
+
+			const page = { path, query, params };
+
+			return { href: url.href, route, match, page };
+		}
+	}
+}
+
+export function handle_error(url: URL) {
+	const { pathname, search } = location;
+	const { session, preloaded, status, error } = initial_data;
+
+	if (!root_preloaded) {
+		root_preloaded = preloaded && preloaded[0]
+	}
+
+	const props = {
+		error,
+		status,
+		session,
+		level0: {
+			props: root_preloaded
+		},
+		level1: {
+			props: {
+				status,
+				error
+			},
+			component: ErrorComponent
+		},
+		segments: preloaded
+
+	}
+	const query = extract_query(search);
+	render(null, [], props, { path: pathname, query, params: {} });
+}
+
+export function scroll_state() {
+	return {
+		x: pageXOffset,
+		y: pageYOffset
+	};
+}
+
+export async function navigate(target: Target, id: number, noscroll?: boolean, hash?: string): Promise<any> {
+	if (id) {
+		// popstate or initial navigation
+		cid = id;
+	} else {
+		const current_scroll = scroll_state();
+
+		// clicked on a link. preserve scroll state
+		scroll_history[cid] = current_scroll;
+
+		id = cid = ++uid;
+		scroll_history[cid] = noscroll ? current_scroll : { x: 0, y: 0 };
+	}
+
+	cid = id;
+
+	if (root_component) stores.preloading.set(true);
+
+	const loaded = prefetching && prefetching.href === target.href ?
+		prefetching.promise :
+		hydrate_target(target);
+
+	prefetching = null;
+
+	const token = current_token = {};
+	const { redirect, props, branch } = await loaded;
+	if (token !== current_token) return; // a secondary navigation happened while we were loading
+
+	await render(redirect, branch, props, target.page);
+	if (document.activeElement) document.activeElement.blur();
+
+	if (!noscroll) {
+		let scroll = scroll_history[id];
+
+		if (hash) {
+			// scroll is an element id (from a hash), we need to compute y.
+			const deep_linked = document.getElementById(hash.slice(1));
+
+			if (deep_linked) {
+				scroll = {
+					x: 0,
+					y: deep_linked.getBoundingClientRect().top
+				};
+			}
+		}
+
+		scroll_history[cid] = scroll;
+		if (scroll) scrollTo(scroll.x, scroll.y);
+	}
+}
+
+async function render(redirect: Redirect, branch: any[], props: any, page: Page) {
+	if (redirect) return goto(redirect.location, { replaceState: true });
+
+	stores.page.set(page);
+	stores.preloading.set(false);
+
+	if (root_component) {
+		root_component.$set(props);
+	} else {
+		props.session = session;
+		props.level0 = {
+			props: await root_preloaded
+		};
+
+		// first load — remove SSR'd <head> contents
+		const start = document.querySelector('#sapper-head-start');
+		const end = document.querySelector('#sapper-head-end');
+
+		if (start && end) {
+			while (start.nextSibling !== end) detach(start.nextSibling);
+			detach(start);
+			detach(end);
+		}
+
+		root_component = new App({
+			target,
+			props,
+			hydrate: true
+		});
+	}
+
+	current_branch = branch;
+	ready = true;
+	session_dirty = false;
+}
+
+export async function hydrate_target(target: Target): Promise<{
+	redirect?: Redirect;
+	props?: any;
+	branch?: Array<{ Component: ComponentConstructor, preload: (page) => Promise<any>, segment: string }>;
+}> {
+	const { route, page } = target;
+	const segments = page.path.split('/').filter(Boolean);
+
+	let redirect: Redirect = null;
+
+	const props = { error: null, status: 200, segments: [segments[0]] };
+
+	const preload_context = {
+		fetch: (url: string, opts?: any) => fetch(url, opts),
+		redirect: (statusCode: number, location: string) => {
+			if (redirect && (redirect.statusCode !== statusCode || redirect.location !== location)) {
+				throw new Error(`Conflicting redirects`);
+			}
+			redirect = { statusCode, location };
+		},
+		error: (status: number, error: Error | string) => {
+			props.error = typeof error === 'string' ? new Error(error) : error;
+			props.status = status;
+		}
+	};
+
+	if (!root_preloaded) {
+		root_preloaded = initial_data.preloaded[0] || root_preload.call(preload_context, {
+			path: page.path,
+			query: page.query,
+			params: {}
+		}, $session);
+	}
+
+	let branch;
+	let l = 1;
+
+	try {
+		branch = await Promise.all(route.parts.map(async (part, i) => {
+			props.segments[l] = segments[i + 1]; // TODO make this less confusing
+			if (!part) return null;
+
+			const j = l++;
+
+			const segment = segments[i];
+			if (!session_dirty && current_branch[i] && current_branch[i].segment === segment && current_branch[i].part === part.i) return current_branch[i];
+
+			const { default: component, preload } = await load_component(components[part.i]);
+
+			let preloaded;
+			if (ready || !initial_data.preloaded[i + 1]) {
+				preloaded = preload
+					? await preload.call(preload_context, {
+						path: page.path,
+						query: page.query,
+						params: part.params ? part.params(target.match) : {}
+					}, $session)
+					: {};
+			} else {
+				preloaded = initial_data.preloaded[i + 1];
+			}
+
+			return (props[`level${j}`] = { component, props: preloaded, segment, part: part.i });
+		}));
+	} catch (error) {
+		props.error = error;
+		props.status = 500;
+		branch = [];
+	}
+
+	return { redirect, props, branch };
+}
+
+function load_css(chunk: string) {
+	const href = `client/${chunk}`;
+	if (document.querySelector(`link[href="${href}"]`)) return;
+
+	return new Promise((fulfil, reject) => {
+		const link = document.createElement('link');
+		link.rel = 'stylesheet';
+		link.href = href;
+
+		link.onload = () => fulfil();
+		link.onerror = reject;
+
+		document.head.appendChild(link);
+	});
+}
+
+export function load_component(component: ComponentLoader): Promise<{
+	default: ComponentConstructor,
+	preload?: (input: any) => any
+}> {
+	// TODO this is temporary — once placeholders are
+	// always rewritten, scratch the ternary
+	const promises: Array<Promise<any>> = (typeof component.css === 'string' ? [] : component.css.map(load_css));
+	promises.unshift(component.js());
+	return Promise.all(promises).then(values => values[0]);
+}
+
+function detach(node: Node) {
+	node.parentNode.removeChild(node);
+}

runtime/src/app/goto/index.ts

@@ -1,7 +1,7 @@
-import { history, select_route, navigate, cid } from '../app';
+import { history, select_target, navigate, cid } from '../app';
 
 export default function goto(href: string, opts = { replaceState: false }) {
-	const target = select_route(new URL(href, document.baseURI));
+	const target = select_target(new URL(href, document.baseURI));
 
 	if (target) {
 		history[opts.replaceState ? 'replaceState' : 'pushState']({ id: cid }, '', href);

runtime/src/app/index.ts

@@ -0,0 +1,12 @@
+import { getContext } from 'svelte';
+import { CONTEXT_KEY, stores } from '@sapper/internal/shared';
+
+export const preloading = { subscribe: stores.preloading.subscribe };
+export const page = { subscribe: stores.page.subscribe };
+
+export const getSession = () => getContext(CONTEXT_KEY);
+
+export { default as start } from './start/index';
+export { default as goto } from './goto/index';
+export { default as prefetch } from './prefetch/index';
+export { default as prefetchRoutes } from './prefetchRoutes/index';

runtime/src/app/prefetch/index.ts

@@ -0,0 +1,14 @@
+import { select_target, prefetching, set_prefetching, hydrate_target } from '../app';
+import { Target } from '../types';
+
+export default function prefetch(href: string) {
+	const target: Target = select_target(new URL(href, document.baseURI));
+
+	if (target) {
+		if (!prefetching || href !== prefetching.href) {
+			set_prefetching(href, hydrate_target(target));
+		}
+
+		return prefetching.promise;
+	}
+}

runtime/src/app/prefetchRoutes/index.ts

@@ -1,11 +1,12 @@
-import { components, pages, load_component } from "../app";
+import { components, routes } from '@sapper/internal/manifest-client';
+import { load_component } from '../app';
 
 export default function prefetchRoutes(pathnames: string[]) {
-	return pages
+	return routes
-		.filter(route => {
+		.filter(pathnames
-			if (!pathnames) return true;
+			? route => pathnames.some(pathname => route.pattern.test(pathname))
-			return pathnames.some(pathname => route.pattern.test(pathname));
+			: () => true
-		})
+		)
 		.reduce((promise: Promise<any>, route) => promise.then(() => {
 			return Promise.all(route.parts.map(part => part && load_component(components[part.i])));
 		}), Promise.resolve());

runtime/src/app/start/index.ts

@@ -5,26 +5,23 @@ import {
 	navigate,
 	scroll_history,
 	scroll_state,
-	select_route,
+	select_target,
-	set_store,
+	handle_error,
 	set_target,
 	uid,
 	set_uid,
 	set_cid
 } from '../app';
 import prefetch from '../prefetch/index';
-import { Store, ScrollPosition } from '../types';
 
 export default function start(opts: {
-	target: Node,
+	target: Node
-	store?: (data: any) => Store
 }) {
 	if ('scrollRestoration' in history) {
 		history.scrollRestoration = 'manual';
 	}
 
 	set_target(opts.target);
-	if (opts.store) set_store(opts.store);
 
 	addEventListener('click', handle_click);
 	addEventListener('popstate', handle_popstate);
@@ -38,10 +35,12 @@ export default function start(opts: {
 
 		history.replaceState({ id: uid }, '', href);
 
-		if (!initial_data.error) {
+		const url = new URL(location.href);
-			const target = select_route(new URL(location.href));
+
-			if (target) return navigate(target, uid, false, hash);
+		if (initial_data.error) return handle_error(url);
-		}
+
+		const target = select_target(url);
+		if (target) return navigate(target, uid, false, hash);
 	});
 }
 
@@ -96,7 +95,7 @@ function handle_click(event: MouseEvent) {
 	// Don't handle hash changes
 	if (url.pathname === location.pathname && url.search === location.search) return;
 
-	const target = select_route(url);
+	const target = select_target(url);
 	if (target) {
 		const noscroll = a.hasAttribute('sapper-noscroll');
 		navigate(target, null, noscroll, url.hash);
@@ -119,7 +118,7 @@ function handle_popstate(event: PopStateEvent) {
 
 	if (event.state) {
 		const url = new URL(location.href);
-		const target = select_route(url);
+		const target = select_target(url);
 		if (target) {
 			navigate(target, event.state.id);
 		} else {

runtime/src/app/types.ts

@@ -8,21 +8,14 @@ type Child = {
 	component?: Component;
 };
 
-export type RootProps = {
-	path: string;
-	params: Record<string, string>;
-	query: Record<string, string>;
-	child: Child;
-};
-
 export interface ComponentConstructor {
-	new (options: { target: Node, data: any, store: Store, hydrate: boolean }): Component;
+	new (options: { target: Node, props: any, hydrate: boolean }): Component;
 	preload: (props: { params: Params, query: Query }) => Promise<any>;
 };
 
 export interface Component {
-	set: (data: any) => void;
+	$set: (data: any) => void;
-	destroy: () => void;
+	$destroy: () => void;
 }
 
 export type ComponentLoader = {
@@ -30,7 +23,7 @@ export type ComponentLoader = {
 	css: string[]
 };
 
-export type Page = {
+export type Route = {
 	pattern: RegExp;
 	parts: Array<{
 		i: number;
@@ -42,7 +35,7 @@ export type Manifest = {
 	ignore: RegExp[];
 	root: ComponentConstructor;
 	error: () => Promise<{ default: ComponentConstructor }>;
-	pages: Page[]
+	pages: Route[]
 };
 
 export type ScrollPosition = {
@@ -51,11 +44,10 @@ export type ScrollPosition = {
 };
 
 export type Target = {
-	url: URL;
+	href: string;
-	path: string;
+	route: Route;
-	page: Page;
 	match: RegExpExecArray;
-	query: Record<string, string | string[]>;
+	page: Page;
 };
 
 export type Redirect = {
@@ -63,6 +55,8 @@ export type Redirect = {
 	location: string;
 };
 
-export type Store = {
+export type Page = {
-	get: () => any;
+	path: string;
-}
+	params: Record<string, string>;
+	query: Record<string, string | string[]>;
+};

runtime/src/server/constants.js

@@ -0,0 +1 @@
+export const IGNORE = '__SAPPER__IGNORE__';

runtime/src/server/middleware/get_page_handler.ts

@@ -1,15 +1,19 @@
-import * as fs from 'fs';
+import { writable } from 'svelte/store.mjs';
-import * as path from 'path';
+import fs from 'fs';
+import path from 'path';
 import cookie from 'cookie';
 import devalue from 'devalue';
 import fetch from 'node-fetch';
-import { URL, resolve } from 'url';
+import URL from 'url';
-import { build_dir, dev, src_dir, IGNORE } from '../placeholders';
+import { IGNORE } from '../constants';
-import { Manifest, Page, Props, Req, Res, Store } from './types';
+import { Manifest, Page, Props, Req, Res } from './types';
+import { build_dir, dev, src_dir } from '@sapper/internal/manifest-server';
+import { stores } from '@sapper/internal/shared';
+import App from '@sapper/internal/App.svelte';
 
 export function get_page_handler(
 	manifest: Manifest,
-	store_getter: (req: Req, res: Res) => Store
+	session_getter: (req: Req, res: Res) => any
 ) {
 	const get_build_info = dev
 		? () => JSON.parse(fs.readFileSync(path.join(build_dir, 'build.json'), 'utf-8'))
@@ -34,7 +38,7 @@ export function get_page_handler(
 	}
 
 	async function handle_page(page: Page, req: Req, res: Res, status = 200, error: Error | string = null) {
-		const isSWIndexHtml = req.path === '/service-worker-index.html';
+		const is_service_worker_index = req.path === '/service-worker-index.html';
 		const build_info: {
 			bundler: 'rollup' | 'webpack',
 			shimport: string | null,
@@ -48,7 +52,7 @@ export function get_page_handler(
 		// preload main.js and current route
 		// TODO detect other stuff we can preload? images, CSS, fonts?
 		let preloaded_chunks = Array.isArray(build_info.assets.main) ? build_info.assets.main : [build_info.assets.main];
-		if (!error && !isSWIndexHtml) {
+		if (!error && !is_service_worker_index) {
 			page.parts.forEach(part => {
 				if (!part) return;
 
@@ -77,7 +81,7 @@ export function get_page_handler(
 			res.setHeader('Link', link);
 		}
 
-		const store = store_getter ? store_getter(req, res) : null;
+		const session = session_getter(req, res);
 
 		let redirect: { statusCode: number, location: string };
 		let preload_error: { statusCode: number, message: Error | string };
@@ -94,7 +98,7 @@ export function get_page_handler(
 				preload_error = { statusCode, message };
 			},
 			fetch: (url: string, opts?: any) => {
-				const parsed = new URL(url, `http://127.0.0.1:${process.env.PORT}${req.baseUrl ? req.baseUrl + '/' :''}`);
+				const parsed = new URL.URL(url, `http://127.0.0.1:${process.env.PORT}${req.baseUrl ? req.baseUrl + '/' :''}`);
 
 				if (opts) {
 					opts = Object.assign({}, opts);
@@ -105,7 +109,7 @@ export function get_page_handler(
 					);
 
 					if (include_cookies) {
-						if (!opts.headers) opts.headers = {};
+						opts.headers = Object.assign({}, opts.headers);
 
 						const cookies = Object.assign(
 							{},
@@ -128,35 +132,39 @@ export function get_page_handler(
 				}
 
 				return fetch(parsed.href, opts);
-			},
+			}
-			store
 		};
 
 		let preloaded;
 		let match;
+		let params;
 
 		try {
-			const root_preloaded = manifest.root.preload
+			const root_preloaded = manifest.root_preload
-				? manifest.root.preload.call(preload_context, {
+				? manifest.root_preload.call(preload_context, {
 					path: req.path,
 					query: req.query,
 					params: {}
-				})
+				}, session)
 				: {};
 
 			match = error ? null : page.pattern.exec(req.path);
 
+
 			let toPreload = [root_preloaded];
-			if (!isSWIndexHtml) {
+			if (!is_service_worker_index) {
 				toPreload = toPreload.concat(page.parts.map(part => {
 					if (!part) return null;
 
-					return part.component.preload
+					// the deepest level is used below, to initialise the store
-						? part.component.preload.call(preload_context, {
+					params = part.params ? part.params(match) : {};
+
+					return part.preload
+						? part.preload.call(preload_context, {
 							path: req.path,
 							query: req.query,
-							params: part.params ? part.params(match) : {}
+							params
-						})
+						}, session)
 						: {};
 				}))
 			}
@@ -169,7 +177,7 @@ export function get_page_handler(
 
 		try {
 			if (redirect) {
-				const location = resolve(req.baseUrl || '/', redirect.location);
+				const location = URL.resolve(req.baseUrl || '/', redirect.location);
 
 				res.statusCode = redirect.statusCode;
 				res.setHeader('Location', location);
@@ -183,67 +191,67 @@ export function get_page_handler(
 				return;
 			}
 
-			const serialized = {
-				preloaded: `[${preloaded.map(data => try_serialize(data)).join(',')}]`,
-				store: store && try_serialize(store.get())
-			};
-
 			const segments = req.path.split('/').filter(Boolean);
 
-			const props: Props = {
+			// TODO make this less confusing
-				path: req.path,
+			const layout_segments = [segments[0]];
-				query: req.query,
+			let l = 1;
-				params: {},
-				child: null
-			};
 
-			if (error) {
+			page.parts.forEach((part, i) => {
-				props.error = error instanceof Error ? error : { message: error };
+				layout_segments[l] = segments[i + 1];
-				props.status = status;
+				if (!part) return null;
-			}
+				l++;
-
-			const data = Object.assign({}, props, preloaded[0], {
-				params: {},
-				child: {
-					segment: segments[0]
-				}
 			});
 
-			let level = data.child;
+			const props = {
-			if (isSWIndexHtml) {
+				segments: layout_segments,
-				level.props = Object.assign({}, props, {
+				status: error ? status : 200,
-					params: {}
+				error: error ? error instanceof Error ? error : { message: error } : null,
-				})
+				session: writable(session),
-			} else {
+				level0: {
+					props: preloaded[0]
+				},
+				level1: {
+					segment: segments[0],
+					props: {}
+				}
+			};
+
+			if (!is_service_worker_index) {
+				let l = 1;
 				for (let i = 0; i < page.parts.length; i += 1) {
 					const part = page.parts[i];
 					if (!part) continue;
 
-					const get_params = part.params || (() => ({}));
+					props[`level${l++}`] = {
-
-					Object.assign(level, {
 						component: part.component,
-						props: Object.assign({}, props, {
+						props: preloaded[i + 1] || {},
-							params: get_params(match)
+						segment: segments[i]
-						}, preloaded[i + 1])
-					});
-
-					level.props.child = <Props["child"]>{
-						segment: segments[i + 1]
 					};
-					level = level.props.child;
 				}
 			}
 
-			const { html, head, css } = manifest.root.render(data, {
+			stores.page.set({
-				store
+				path: req.path,
+				query: req.query,
+				params: params
 			});
 
+			const { html, head, css } = App.render(props);
+
+			const serialized = {
+				preloaded: `[${preloaded.map(data => try_serialize(data)).join(',')}]`,
+				session: session && try_serialize(session, err => {
+					throw new Error(`Failed to serialize session data: ${err.message}`);
+				}),
+				error: error && try_serialize(props.error)
+			};
+
 			let script = `__SAPPER__={${[
-				error && `error:1`,
+				error && `error:${serialized.error},status:${status}`,
 				`baseUrl:"${req.baseUrl}"`,
 				serialized.preloaded && `preloaded:${serialized.preloaded}`,
-				serialized.store && `store:${serialized.store}`
+				serialized.session && `session:${serialized.session}`
 			].filter(Boolean).join(',')}};`;
 
 			if (has_service_worker) {
@@ -302,6 +310,7 @@ export function get_page_handler(
 			res.statusCode = status;
 			res.end(body);
 		} catch(err) {
+			console.log(err);
 			if (error) {
 				// we encountered an error while rendering the error page — oops
 				res.statusCode = 500;
@@ -321,12 +330,10 @@ export function get_page_handler(
 			return;
 		}
 
-		if (!server_routes.some(route => route.pattern.test(req.path))) {
+		for (const page of pages) {
-			for (const page of pages) {
+			if (page.pattern.test(req.path)) {
-				if (page.pattern.test(req.path)) {
+				handle_page(page, req, res);
-					handle_page(page, req, res);
+				return;
-					return;
-				}
 			}
 		}
 
@@ -338,10 +345,11 @@ function read_template(dir = build_dir) {
 	return fs.readFileSync(`${dir}/template.html`, 'utf-8');
 }
 
-function try_serialize(data: any) {
+function try_serialize(data: any, fail?: (err) => void) {
 	try {
 		return devalue(data);
 	} catch (err) {
+		if (fail) fail(err);
 		return null;
 	}
 }

runtime/src/server/middleware/get_server_route_handler.ts

@@ -1,4 +1,4 @@
-import { IGNORE } from '../placeholders';
+import { IGNORE } from '../constants';
 import { Req, Res, ServerRoute } from './types';
 
 export function get_server_route_handler(routes: ServerRoute[]) {

runtime/src/server/middleware/index.ts

@@ -1,16 +1,17 @@
-import * as fs from 'fs';
+import fs from 'fs';
-import * as path from 'path';
+import path from 'path';
-import { build_dir, dev, manifest, IGNORE } from '../placeholders';
+import { build_dir, dev, manifest } from '@sapper/internal/manifest-server';
-import { Handler, Req, Res, Store } from './types';
+import { Handler, Req, Res } from './types';
 import { get_server_route_handler } from './get_server_route_handler';
 import { get_page_handler } from './get_page_handler';
 import { lookup } from './mime';
+import { IGNORE } from '../constants';
 
 export default function middleware(opts: {
-	store?: (req: Req, res: Res) => Store,
+	session?: (req: Req, res: Res) => any,
 	ignore?: any
 } = {}) {
-	const { store, ignore } = opts;
+	const { session, ignore } = opts;
 
 	let emitted_basepath = false;
 
@@ -51,11 +52,6 @@ export default function middleware(opts: {
 			next();
 		},
 
-		fs.existsSync(path.join(build_dir, 'index.html')) && serve({
-			pathname: '/index.html',
-			cache_control: dev ? 'no-cache' : 'max-age=600'
-		}),
-
 		fs.existsSync(path.join(build_dir, 'service-worker.js')) && serve({
 			pathname: '/service-worker.js',
 			cache_control: 'no-cache, no-store, must-revalidate'
@@ -73,7 +69,7 @@ export default function middleware(opts: {
 
 		get_server_route_handler(manifest.server_routes),
 
-		get_page_handler(manifest, store)
+		get_page_handler(manifest, session || noop)
 	].filter(Boolean));
 }
 
@@ -141,3 +137,5 @@ export function serve({ prefix, pathname, cache_control }: {
 		}
 	};
 }
+
+function noop(){}

runtime/src/server/middleware/types.ts

@@ -12,6 +12,7 @@ export type Page = {
 		name: string;
 		component: Component;
 		params?: (match: RegExpMatchArray) => Record<string, string>;
+		preload?: (data: any) => any | Promise<any>;
 	}>
 };
 
@@ -19,19 +20,13 @@ export type Manifest = {
 	server_routes: ServerRoute[];
 	pages: Page[];
 	root: Component;
+	root_preload?: (data: any) => any | Promise<any>;
 	error: Component;
 }
 
 export type Handler = (req: Req, res: Res, next: () => void) => void;
 
-export type Store = {
-	get: () => any
-};
-
 export type Props = {
-	path: string;
-	query: Record<string, string>;
-	params: Record<string, string>;
 	error?: { message: string };
 	status?: number;
 	child: {
@@ -60,10 +55,9 @@ export interface Res extends ServerResponse {
 export { ServerResponse };
 
 interface Component {
-	render: (data: any, opts: { store: Store }) => {
+	render: (data: any) => {
 		head: string;
 		css: { code: string, map: any };
 		html: string
-	},
+	}
-	preload: (data: any) => any | Promise<any>
 }

src/api/build.ts

@@ -1,14 +1,14 @@
 import * as fs from 'fs';
 import * as path from 'path';
-import mkdirp from 'mkdirp';
-import rimraf from 'rimraf';
 import minify_html from './utils/minify_html';
-import { create_compilers, create_main_manifests, create_manifest_data, create_serviceworker_manifest } from '../core';
+import { create_compilers, create_app, create_manifest_data, create_serviceworker_manifest } from '../core';
 import { copy_shimport } from './utils/copy_shimport';
 import read_template from '../core/read_template';
 import { CompileResult } from '../core/create_compilers/interfaces';
 import { noop } from './utils/noop';
 import validate_bundler from './utils/validate_bundler';
+import { copy_runtime } from './utils/copy_runtime';
+import { rimraf, mkdirp } from './utils/fs_utils';
 
 type Opts = {
 	cwd?: string;
@@ -26,7 +26,7 @@ export async function build({
 	cwd,
 	src = 'src',
 	routes = 'src/routes',
-	output = '__sapper__',
+	output = 'src/node_modules/@sapper',
 	static: static_files = 'static',
 	dest = '__sapper__/build',
 
@@ -42,14 +42,17 @@ export async function build({
 	routes = path.resolve(cwd, routes);
 	output = path.resolve(cwd, output);
 	static_files = path.resolve(cwd, static_files);
-	dest = path.resolve(cwd, dest);
 
 	if (legacy && bundler === 'webpack') {
 		throw new Error(`Legacy builds are not supported for projects using webpack`);
 	}
 
-	rimraf.sync(path.join(dest, '**/*'));
+	rimraf(output);
-	mkdirp.sync(`${dest}/client`);
+	mkdirp(output);
+	copy_runtime(output);
+
+	rimraf(dest);
+	mkdirp(`${dest}/client`);
 	copy_shimport(dest);
 
 	// minify src/template.html
@@ -67,8 +70,8 @@ export async function build({
 
 	const manifest_data = create_manifest_data(routes);
 
-	// create src/manifest/client.js and src/manifest/server.js
+	// create src/node_modules/@sapper/app.mjs and server.mjs
-	create_main_manifests({
+	create_app({
 		bundler,
 		manifest_data,
 		cwd,

src/api/dev.ts

@@ -3,10 +3,8 @@ import * as fs from 'fs';
 import * as http from 'http';
 import * as child_process from 'child_process';
 import * as ports from 'port-authority';
-import mkdirp from 'mkdirp';
-import rimraf from 'rimraf';
 import { EventEmitter } from 'events';
-import { create_manifest_data, create_main_manifests, create_compilers, create_serviceworker_manifest } from '../core';
+import { create_manifest_data, create_app, create_compilers, create_serviceworker_manifest } from '../core';
 import { Compiler, Compilers } from '../core/create_compilers';
 import { CompileResult } from '../core/create_compilers/interfaces';
 import Deferred from './utils/Deferred';
@@ -15,6 +13,8 @@ import { copy_shimport } from './utils/copy_shimport';
 import { ManifestData, FatalEvent, ErrorEvent, ReadyEvent, InvalidEvent } from '../interfaces';
 import read_template from '../core/read_template';
 import { noop } from './utils/noop';
+import { copy_runtime } from './utils/copy_runtime';
+import { rimraf, mkdirp } from './utils/fs_utils';
 
 type Opts = {
 	cwd?: string,
@@ -72,7 +72,7 @@ class Watcher extends EventEmitter {
 		cwd = '.',
 		src = 'src',
 		routes = 'src/routes',
-		output = '__sapper__',
+		output = 'src/node_modules/@sapper',
 		static: static_files = 'static',
 		dest = '__sapper__/dev',
 		'dev-port': dev_port,
@@ -144,8 +144,13 @@ class Watcher extends EventEmitter {
 		}
 
 		const { cwd, src, dest, routes, output, static: static_files } = this.dirs;
-		rimraf.sync(dest);
+
-		mkdirp.sync(`${dest}/client`);
+		rimraf(output);
+		mkdirp(output);
+		copy_runtime(output);
+
+		rimraf(dest);
+		mkdirp(`${dest}/client`);
 		if (this.bundler === 'rollup') copy_shimport(dest);
 
 		if (!this.dev_port) this.dev_port = await ports.find(10000);
@@ -157,7 +162,7 @@ class Watcher extends EventEmitter {
 
 		try {
 			manifest_data = create_manifest_data(routes);
-			create_main_manifests({
+			create_app({
 				bundler: this.bundler,
 				manifest_data,
 				dev: true,
@@ -185,7 +190,7 @@ class Watcher extends EventEmitter {
 				() => {
 					try {
 						const new_manifest_data = create_manifest_data(routes);
-						create_main_manifests({
+						create_app({
 							bundler: this.bundler,
 							manifest_data, // TODO is this right? not new_manifest_data?
 							dev: true,
@@ -194,9 +199,10 @@ class Watcher extends EventEmitter {
 						});
 
 						manifest_data = new_manifest_data;
-					} catch (err) {
+					} catch (error) {
 						this.emit('error', <ErrorEvent>{
-							message: err.message
+							type: 'manifest',
+							error
 						});
 					}
 				}
@@ -403,11 +409,11 @@ class Watcher extends EventEmitter {
 	}) {
 		compiler.oninvalid(invalid);
 
-		compiler.watch((err?: Error, result?: CompileResult) => {
+		compiler.watch((error?: Error, result?: CompileResult) => {
-			if (err) {
+			if (error) {
 				this.emit('error', <ErrorEvent>{
 					type: name,
-					message: err.message
+					error
 				});
 			} else {
 				this.emit('build', {
@@ -484,7 +490,7 @@ function watch_dir(
 	let watch: any;
 	let closed = false;
 
-	import('cheap-watch').then(CheapWatch => {
+	import('cheap-watch').then(({ default: CheapWatch }) => {
 		if (closed) return;
 
 		watch = new CheapWatch({ dir, filter, debounce: 50 });

src/api/export.ts

@@ -1,13 +1,16 @@
 import * as child_process from 'child_process';
+import * as fs from 'fs';
 import * as path from 'path';
-import * as sander from 'sander';
 import * as url from 'url';
 import fetch from 'node-fetch';
+import * as yootils from 'yootils';
 import * as ports from 'port-authority';
 import clean_html from './utils/clean_html';
 import minify_html from './utils/minify_html';
 import Deferred from './utils/Deferred';
 import { noop } from './utils/noop';
+import { parse as parseLinkHeader } from 'http-link-header';
+import { rimraf, copy, mkdirp } from './utils/fs_utils';
 
 type Opts = {
 	build_dir?: string,
@@ -20,6 +23,12 @@ type Opts = {
 	onfile?: ({ file, size, status }: { file: string, size: number, status: number }) => void;
 };
 
+type Ref = {
+	uri: string,
+	rel: string,
+	as: string
+};
+
 function resolve(from: string, to: string) {
 	return url.parse(url.resolve(from, to));
 }
@@ -46,20 +55,15 @@ async function _export({
 	export_dir = path.resolve(cwd, export_dir, basepath);
 
 	// Prep output directory
-	sander.rimrafSync(export_dir);
+	rimraf(export_dir);
 
-	sander.copydirSync(static_files).to(export_dir);
+	copy(static_files, export_dir);
-	sander.copydirSync(build_dir, 'client').to(export_dir, 'client');
+	copy(path.join(build_dir, 'client'), path.join(export_dir, 'client'));
+	copy(path.join(build_dir, 'service-worker.js'), path.join(export_dir, 'service-worker.js'));
+	copy(path.join(build_dir, 'service-worker.js.map'), path.join(export_dir, 'service-worker.js.map'));
 
-	if (sander.existsSync(build_dir, 'service-worker.js')) {
+	const defaultPort = process.env.PORT ? parseInt(process.env.PORT) : 3000;
-		sander.copyFileSync(build_dir, 'service-worker.js').to(export_dir, 'service-worker.js');
+	const port = await ports.find(defaultPort);
-	}
-
-	if (sander.existsSync(build_dir, 'service-worker.js.map')) {
-		sander.copyFileSync(build_dir, 'service-worker.js.map').to(export_dir, 'service-worker.js.map');
-	}
-
-	const port = await ports.find(3000);
 
 	const protocol = 'http:';
 	const host = `localhost:${port}`;
@@ -84,8 +88,8 @@ async function _export({
 	const seen = new Set();
 	const saved = new Set();
 
-	function save(path: string, status: number, type: string, body: string) {
+	function save(url: string, status: number, type: string, body: string) {
-		const { pathname } = resolve(origin, path);
+		const { pathname } = resolve(origin, url);
 		let file = decodeURIComponent(pathname.slice(1));
 
 		if (saved.has(file)) return;
@@ -106,7 +110,9 @@ async function _export({
 			status
 		});
 
-		sander.writeFileSync(export_dir, file, body);
+		const export_file = path.join(export_dir, file);
+		mkdirp(path.dirname(export_file));
+		fs.writeFileSync(export_file, body);
 	}
 
 	proc.on('message', message => {
@@ -138,37 +144,48 @@ async function _export({
 		clearTimeout(the_timeout); // prevent it hanging at the end
 
 		let type = r.headers.get('Content-Type');
+
 		let body = await r.text();
 
 		const range = ~~(r.status / 100);
 
 		if (range === 2) {
-			if (type === 'text/html' && pathname !== '/service-worker-index.html') {
+			if (type === 'text/html') {
-				const urls: URL[] = [];
+				// parse link rel=preload headers and embed them in the HTML
+				let link = parseLinkHeader(r.headers.get('Link') || '');
+				link.refs.forEach((ref: Ref) => {
+					if (ref.rel === 'preload') {
+						body = body.replace('</head>',
+							`<link rel="preload" as=${JSON.stringify(ref.as)} href=${JSON.stringify(ref.uri)}></head>`)
+					}
+				});
+				if (pathname !== '/service-worker-index.html') {
+					const cleaned = clean_html(body);
 
-				const cleaned = clean_html(body);
+					const q = yootils.queue(8);
 
-				const base_match = /<base ([\s\S]+?)>/m.exec(cleaned);
+					const base_match = /<base ([\s\S]+?)>/m.exec(cleaned);
-				const base_href = base_match && get_href(base_match[1]);
+					const base_href = base_match && get_href(base_match[1]);
-				const base = resolve(url.href, base_href);
+					const base = resolve(url.href, base_href);
 
-				let match;
+					let match;
-				let pattern = /<a ([\s\S]+?)>/gm;
+					let pattern = /<a ([\s\S]+?)>/gm;
 
-				while (match = pattern.exec(cleaned)) {
+					while (match = pattern.exec(cleaned)) {
-					const attrs = match[1];
+						const attrs = match[1];
-					const href = get_href(attrs);
+						const href = get_href(attrs);
 
-					if (href) {
+						if (href) {
-						const url = resolve(base.href, href);
+							const url = resolve(base.href, href);
 
-						if (url.protocol === protocol && url.host === host) {
+							if (url.protocol === protocol && url.host === host) {
-							urls.push(url);
+								q.add(() => handle(url));
+							}
 						}
 					}
-				}
 
-				await Promise.all(urls.map(handle));
+					await q.close();
+				}
 			}
 		}
 
@@ -195,6 +212,6 @@ async function _export({
 }
 
 function get_href(attrs: string) {
-	const match = /href\s*=\s*(?:"(.*?)"|'(.+?)'|([^\s>]+))/.exec(attrs);
+	const match = /href\s*=\s*(?:"(.*?)"|'(.*?)'|([^\s>]*))/.exec(attrs);
-	return match[1] || match[2] || match[3];
+	return match && (match[1] || match[2] || match[3]);
 }

src/api/utils/copy_runtime.ts

@@ -0,0 +1,21 @@
+import * as fs from 'fs';
+import * as path from 'path';
+import { mkdirp } from './fs_utils';
+
+const runtime = [
+	'app.mjs',
+	'server.mjs',
+	'internal/shared.mjs',
+	'internal/layout.svelte',
+	'internal/error.svelte'
+].map(file => ({
+	file,
+	source: fs.readFileSync(path.join(__dirname, `../runtime/${file}`), 'utf-8')
+}));
+
+export function copy_runtime(output: string) {
+	runtime.forEach(({ file, source }) => {
+		mkdirp(path.dirname(`${output}/${file}`));
+		fs.writeFileSync(`${output}/${file}`, source);
+	});
+}

src/api/utils/fs_utils.ts

@@ -0,0 +1,46 @@
+import * as fs from 'fs';
+import * as path from 'path';
+
+export function mkdirp(dir: string) {
+	const parent = path.dirname(dir);
+	if (parent === dir) return;
+
+	mkdirp(parent);
+
+	try {
+		fs.mkdirSync(dir);
+	} catch (err) {
+		// ignore
+	}
+}
+
+export function rimraf(thing: string) {
+	if (!fs.existsSync(thing)) return;
+
+	const stats = fs.statSync(thing);
+
+	if (stats.isDirectory()) {
+		fs.readdirSync(thing).forEach(file => {
+			rimraf(path.join(thing, file));
+		});
+
+		fs.rmdirSync(thing);
+	} else {
+		fs.unlinkSync(thing);
+	}
+}
+
+export function copy(from: string, to: string) {
+	if (!fs.existsSync(from)) return;
+
+	const stats = fs.statSync(from);
+
+	if (stats.isDirectory()) {
+		fs.readdirSync(from).forEach(file => {
+			copy(path.join(from, file), path.join(to, file));
+		});
+	} else {
+		mkdirp(path.dirname(to));
+		fs.writeFileSync(to, fs.readFileSync(from));
+	}
+}

src/cli.ts

@@ -10,7 +10,7 @@ const prog = sade('sapper').version(pkg.version);
 
 if (process.argv[2] === 'start') {
 	// remove this in a future version
-	console.error(colors.bold.red(`'sapper start' has been removed`));
+	console.error(colors.bold().red(`'sapper start' has been removed`));
 	console.error(`Use 'node [build_dir]' instead`);
 	process.exit(1);
 }
@@ -29,7 +29,7 @@ prog.command('dev')
 	.option('--src', 'Source directory', 'src')
 	.option('--routes', 'Routes directory', 'src/routes')
 	.option('--static', 'Static files directory', 'static')
-	.option('--output', 'Sapper output directory', '__sapper__')
+	.option('--output', 'Sapper output directory', 'src/node_modules/@sapper')
 	.option('--build-dir', 'Development build directory', '__sapper__/dev')
 	.action(async (opts: {
 		port: number,
@@ -74,7 +74,7 @@ prog.command('dev')
 
 			watcher.on('ready', async (event: ReadyEvent) => {
 				if (first) {
-					console.log(colors.bold.cyan(`> Listening on http://localhost:${event.port}`));
+					console.log(colors.bold().cyan(`> Listening on http://localhost:${event.port}`));
 					if (opts.open) {
 						const { exec } = await import('child_process');
 						exec(`open http://localhost:${event.port}`);
@@ -85,22 +85,30 @@ prog.command('dev')
 
 			watcher.on('invalid', (event: InvalidEvent) => {
 				const changed = event.changed.map(filename => path.relative(process.cwd(), filename)).join(', ');
-				console.log(`\n${colors.bold.cyan(changed)} changed. rebuilding...`);
+				console.log(`\n${colors.bold().cyan(changed)} changed. rebuilding...`);
 			});
 
 			watcher.on('error', (event: ErrorEvent) => {
-				console.log(colors.red(`✗ ${event.type}`));
+				const { type, error } = event;
-				console.log(colors.red(event.message));
+
+				console.log(colors.bold().red(`✗ ${type}`));
+
+				if (error.loc && error.loc.file) {
+					console.log(colors.bold(`${path.relative(process.cwd(), error.loc.file)} (${error.loc.line}:${error.loc.column})`));
+				}
+
+				console.log(colors.red(event.error.message));
+				if (error.frame) console.log(error.frame);
 			});
 
 			watcher.on('fatal', (event: FatalEvent) => {
-				console.log(colors.bold.red(`> ${event.message}`));
+				console.log(colors.bold().red(`> ${event.message}`));
 				if (event.log) console.log(event.log);
 			});
 
 			watcher.on('build', (event: BuildEvent) => {
 				if (event.errors.length) {
-					console.log(colors.bold.red(`✗ ${event.type}`));
+					console.log(colors.bold().red(`✗ ${event.type}`));
 
 					event.errors.filter(e => !e.duplicate).forEach(error => {
 						if (error.file) console.log(colors.bold(error.file));
@@ -112,7 +120,7 @@ prog.command('dev')
 						console.log(`${hidden} duplicate ${hidden === 1 ? 'error' : 'errors'} hidden\n`);
 					}
 				} else if (event.warnings.length) {
-					console.log(colors.bold.yellow(`• ${event.type}`));
+					console.log(colors.bold().yellow(`• ${event.type}`));
 
 					event.warnings.filter(e => !e.duplicate).forEach(warning => {
 						if (warning.file) console.log(colors.bold(warning.file));
@@ -124,11 +132,12 @@ prog.command('dev')
 						console.log(`${hidden} duplicate ${hidden === 1 ? 'warning' : 'warnings'} hidden\n`);
 					}
 				} else {
-					console.log(`${colors.bold.green(`✔ ${event.type}`)} ${colors.gray(`(${format_milliseconds(event.duration)})`)}`);
+					console.log(`${colors.bold().green(`✔ ${event.type}`)} ${colors.gray(`(${format_milliseconds(event.duration)})`)}`);
 				}
 			});
 		} catch (err) {
-			console.log(colors.bold.red(`> ${err.message}`));
+			console.log(colors.bold().red(`> ${err.message}`));
+			console.log(colors.gray(err.stack));
 			process.exit(1);
 		}
 	});
@@ -141,7 +150,7 @@ prog.command('build [dest]')
 	.option('--cwd', 'Current working directory', '.')
 	.option('--src', 'Source directory', 'src')
 	.option('--routes', 'Routes directory', 'src/routes')
-	.option('--output', 'Sapper output directory', '__sapper__')
+	.option('--output', 'Sapper output directory', 'src/node_modules/@sapper')
 	.example(`build custom-dir -p 4567`)
 	.action(async (dest = '__sapper__/build', opts: {
 		port: string,
@@ -168,9 +177,10 @@ prog.command('build [dest]')
 				require('./server/server.js');
 			`.replace(/^\t+/gm, '').trim());
 
-			console.error(`\n> Finished in ${elapsed(start)}. Type ${colors.bold.cyan(`node ${dest}`)} to run the app.`);
+			console.error(`\n> Finished in ${elapsed(start)}. Type ${colors.bold().cyan(`node ${dest}`)} to run the app.`);
 		} catch (err) {
-			console.log(`${colors.bold.red(`> ${err.message}`)}`);
+			console.log(`${colors.bold().red(`> ${err.message}`)}`);
+			console.log(colors.gray(err.stack));
 			process.exit(1);
 		}
 	});
@@ -186,7 +196,7 @@ prog.command('export [dest]')
 	.option('--src', 'Source directory', 'src')
 	.option('--routes', 'Routes directory', 'src/routes')
 	.option('--static', 'Static files directory', 'static')
-	.option('--output', 'Sapper output directory', '__sapper__')
+	.option('--output', 'Sapper output directory', 'src/node_modules/@sapper')
 	.option('--build-dir', 'Intermediate build directory', '__sapper__/build')
 	.action(async (dest = '__sapper__/export', opts: {
 		build: boolean,
@@ -220,24 +230,24 @@ prog.command('export [dest]')
 				timeout: opts.timeout,
 
 				oninfo: event => {
-					console.log(colors.bold.cyan(`> ${event.message}`));
+					console.log(colors.bold().cyan(`> ${event.message}`));
 				},
 
 				onfile: event => {
-					const size_color = event.size > 150000 ? colors.bold.red : event.size > 50000 ? colors.bold.yellow : colors.bold.gray;
+					const size_color = event.size > 150000 ? colors.bold().red : event.size > 50000 ? colors.bold().yellow : colors.bold().gray;
 						const size_label = size_color(left_pad(pb(event.size), 10));
 
 						const file_label = event.status === 200
 							? event.file
-							: colors.bold[event.status >= 400 ? 'red' : 'yellow'](`(${event.status}) ${event.file}`);
+							: colors.bold()[event.status >= 400 ? 'red' : 'yellow'](`(${event.status}) ${event.file}`);
 
 						console.log(`${size_label}   ${file_label}`);
 				}
 			});
 
-			console.error(`\n> Finished in ${elapsed(start)}. Type ${colors.bold.cyan(`npx serve ${dest}`)} to run the app.`);
+			console.error(`\n> Finished in ${elapsed(start)}. Type ${colors.bold().cyan(`npx serve ${dest}`)} to run the app.`);
 		} catch (err) {
-			console.error(colors.bold.red(`> ${err.message}`));
+			console.error(colors.bold().red(`> ${err.message}`));
 			process.exit(1);
 		}
 	});
@@ -266,12 +276,12 @@ async function _build(
 
 		oncompile: event => {
 			let banner = `built ${event.type}`;
-			let c = colors.cyan;
+			let c = (txt: string) => colors.cyan(txt);
 
 			const { warnings } = event.result;
 			if (warnings.length > 0) {
 				banner += ` with ${warnings.length} ${warnings.length === 1 ? 'warning' : 'warnings'}`;
-				c = colors.yellow;
+				c = (txt: string) => colors.cyan(txt);
 			}
 
 			console.log();

src/core.ts

@@ -1,3 +1,3 @@
-export * from './core/create_manifests';
+export * from './core/create_app';
 export { default as create_compilers } from './core/create_compilers/index';
 export { default as create_manifest_data } from './core/create_manifest_data';

src/core/create_app.ts

@@ -0,0 +1,291 @@
+import * as fs from 'fs';
+import * as path from 'path';
+import { posixify, stringify, walk, write_if_changed } from '../utils';
+import { Page, PageComponent, ManifestData } from '../interfaces';
+
+export function create_app({
+	bundler,
+	manifest_data,
+	dev_port,
+	dev,
+	cwd,
+	src,
+	dest,
+	routes,
+	output
+}: {
+	bundler: string,
+	manifest_data: ManifestData;
+	dev_port?: number;
+	dev: boolean;
+	cwd: string;
+	src: string;
+	dest: string;
+	routes: string;
+	output: string
+}) {
+	if (!fs.existsSync(output)) fs.mkdirSync(output);
+
+	const path_to_routes = path.relative(`${output}/internal`, routes);
+
+	const client_manifest = generate_client_manifest(manifest_data, path_to_routes, bundler, dev, dev_port);
+	const server_manifest = generate_server_manifest(manifest_data, path_to_routes, cwd, src, dest, dev);
+
+	const app = generate_app(manifest_data, path_to_routes);
+
+	write_if_changed(`${output}/internal/manifest-client.mjs`, client_manifest);
+	write_if_changed(`${output}/internal/manifest-server.mjs`, server_manifest);
+	write_if_changed(`${output}/internal/App.svelte`, app);
+}
+
+export function create_serviceworker_manifest({ manifest_data, output, client_files, static_files }: {
+	manifest_data: ManifestData;
+	output: string;
+	client_files: string[];
+	static_files: string;
+}) {
+	let files: string[] = ['service-worker-index.html'];
+
+	if (fs.existsSync(static_files)) {
+		files = files.concat(walk(static_files));
+	} else {
+		// TODO remove in a future version
+		if (fs.existsSync('assets')) {
+			throw new Error(`As of Sapper 0.21, the assets/ directory should become static/`);
+		}
+	}
+
+	let code = `
+		// This file is generated by Sapper — do not edit it!
+		export const timestamp = ${Date.now()};
+
+		export const files = [\n\t${files.map((x: string) => stringify(x)).join(',\n\t')}\n];
+		export { files as assets }; // legacy
+
+		export const shell = [\n\t${client_files.map((x: string) => stringify(x)).join(',\n\t')}\n];
+
+		export const routes = [\n\t${manifest_data.pages.map((r: Page) => `{ pattern: ${r.pattern} }`).join(',\n\t')}\n];
+	`.replace(/^\t\t/gm, '').trim();
+
+	write_if_changed(`${output}/service-worker.js`, code);
+}
+
+function generate_client_manifest(
+	manifest_data: ManifestData,
+	path_to_routes: string,
+	bundler: string,
+	dev: boolean,
+	dev_port?: number
+) {
+	const page_ids = new Set(manifest_data.pages.map(page =>
+		page.pattern.toString()));
+
+	const server_routes_to_ignore = manifest_data.server_routes.filter(route =>
+		!page_ids.has(route.pattern.toString()));
+
+	const component_indexes: Record<string, number> = {};
+
+	const components = `[
+		${manifest_data.components.map((component, i) => {
+			const annotation = bundler === 'webpack'
+				? `/* webpackChunkName: "${component.name}" */ `
+				: '';
+
+			const source = get_file(path_to_routes, component);
+
+			component_indexes[component.name] = i;
+
+			return `{
+					js: () => import(${annotation}${stringify(source)}),
+					css: "__SAPPER_CSS_PLACEHOLDER:${stringify(component.file, false)}__"
+				}`;
+		}).join(',\n\t\t\t\t')}
+	]`.replace(/^\t/gm, '');
+
+	let needs_decode = false;
+
+	let routes = `[
+				${manifest_data.pages.map(page => `{
+					// ${page.parts[page.parts.length - 1].component.file}
+					pattern: ${page.pattern},
+					parts: [
+						${page.parts.map(part => {
+							if (part === null) return 'null';
+
+							if (part.params.length > 0) {
+								needs_decode = true;
+								const props = part.params.map((param, i) => `${param}: d(match[${i + 1}])`);
+								return `{ i: ${component_indexes[part.component.name]}, params: match => ({ ${props.join(', ')} }) }`;
+							}
+
+							return `{ i: ${component_indexes[part.component.name]} }`;
+						}).join(',\n\t\t\t\t\t\t')}
+					]
+				}`).join(',\n\n\t\t\t\t')}
+	]`.replace(/^\t/gm, '');
+
+	if (needs_decode) {
+		routes = `(d => ${routes})(decodeURIComponent)`
+	}
+
+	return `
+		// This file is generated by Sapper — do not edit it!
+		export { default as Root } from '${stringify(get_file(path_to_routes, manifest_data.root), false)}';
+		export { preload as root_preload } from '${manifest_data.root.has_preload ? stringify(get_file(path_to_routes, manifest_data.root), false) : './shared'}';
+		export { default as ErrorComponent } from '${stringify(get_file(path_to_routes, manifest_data.error), false)}';
+
+		export const ignore = [${server_routes_to_ignore.map(route => route.pattern).join(', ')}];
+
+		export const components = ${components};
+
+		export const routes = ${routes};
+
+		${dev ? `if (typeof window !== 'undefined') {
+			import(${stringify(posixify(path.resolve(__dirname, '../sapper-dev-client.js')))}).then(client => {
+				client.connect(${dev_port});
+			});
+		}` : ''}
+	`.replace(/^\t{2}/gm, '').trim();
+}
+
+function generate_server_manifest(
+	manifest_data: ManifestData,
+	path_to_routes: string,
+	cwd: string,
+	src: string,
+	dest: string,
+	dev: boolean
+) {
+	const imports = [].concat(
+		manifest_data.server_routes.map((route, i) =>
+			`import * as route_${i} from ${stringify(posixify(`${path_to_routes}/${route.file}`))};`),
+		manifest_data.components.map((component, i) =>
+			`import component_${i}${component.has_preload ? `, { preload as preload_${i} }` : ''} from ${stringify(get_file(path_to_routes, component))};`),
+		`import root${manifest_data.root.has_preload ? `, { preload as root_preload }` : ''} from ${stringify(get_file(path_to_routes, manifest_data.root))};`,
+		`import error from ${stringify(get_file(path_to_routes, manifest_data.error))};`
+	);
+
+	const component_lookup: Record<string, number> = {};
+	manifest_data.components.forEach((component, i) => {
+		component_lookup[component.name] = i;
+	});
+
+	let code = `
+		`.replace(/^\t\t/gm, '').trim();
+
+	const build_dir = posixify(path.relative(cwd, dest));
+	const src_dir = posixify(path.relative(cwd, src));
+
+	return `
+		// This file is generated by Sapper — do not edit it!
+		${imports.join('\n')}
+
+		const d = decodeURIComponent;
+
+		export const manifest = {
+			server_routes: [
+				${manifest_data.server_routes.map((route, i) => `{
+					// ${route.file}
+					pattern: ${route.pattern},
+					handlers: route_${i},
+					params: ${route.params.length > 0
+						? `match => ({ ${route.params.map((param, i) => `${param}: d(match[${i + 1}])`).join(', ')} })`
+						: `() => ({})`}
+				}`).join(',\n\n\t\t\t\t')}
+			],
+
+			pages: [
+				${manifest_data.pages.map(page => `{
+					// ${page.parts[page.parts.length - 1].component.file}
+					pattern: ${page.pattern},
+					parts: [
+						${page.parts.map(part => {
+							if (part === null) return 'null';
+
+							const props = [
+								`name: "${part.component.name}"`,
+								`file: ${stringify(part.component.file)}`,
+								`component: component_${component_lookup[part.component.name]}`,
+								part.component.has_preload && `preload: preload_${component_lookup[part.component.name]}`
+							].filter(Boolean);
+
+							if (part.params.length > 0) {
+								const params = part.params.map((param, i) => `${param}: d(match[${i + 1}])`);
+								props.push(`params: match => ({ ${params.join(', ')} })`);
+							}
+
+							return `{ ${props.join(', ')} }`;
+						}).join(',\n\t\t\t\t\t\t')}
+					]
+				}`).join(',\n\n\t\t\t\t')}
+			],
+
+			root,
+			root_preload${manifest_data.root.has_preload ? '' : `: () => {}`},
+			error
+		};
+
+		export const build_dir = ${JSON.stringify(build_dir)};
+
+		export const src_dir = ${JSON.stringify(src_dir)};
+
+		export const dev = ${dev ? 'true' : 'false'};
+	`.replace(/^\t{2}/gm, '').trim();
+}
+
+function generate_app(manifest_data: ManifestData, path_to_routes: string) {
+	// TODO remove default layout altogether
+
+	const max_depth = Math.max(...manifest_data.pages.map(page => page.parts.filter(Boolean).length));
+
+	const levels = [];
+	for (let i = 0; i < max_depth; i += 1) {
+		levels.push(i + 1);
+	}
+
+	let l = max_depth;
+
+	let pyramid = `<svelte:component this={level${l}.component} {...level${l}.props}/>`;
+
+	while (l-- > 1) {
+		pyramid = `
+			<svelte:component this={level${l}.component} segment={segments[${l}]} {...level${l}.props}>
+				{#if level${l + 1}}
+					${pyramid.replace(/\n/g, '\n\t\t\t\t\t')}
+				{/if}
+			</svelte:component>
+		`.replace(/^\t\t\t/gm, '').trim();
+	}
+
+	return `
+		<!-- This file is generated by Sapper — do not edit it! -->
+		<script>
+			import { setContext } from 'svelte';
+			import { CONTEXT_KEY } from './shared';
+			import Layout from '${get_file(path_to_routes, manifest_data.root)}';
+			import Error from '${get_file(path_to_routes, manifest_data.error)}';
+
+			export let session;
+			export let error;
+			export let status;
+			export let segments;
+			export let level0;
+			${levels.map(l => `export let level${l} = null;`).join('\n\t\t\t')}
+
+			setContext(CONTEXT_KEY, session);
+		</script>
+
+		<Layout segment={segments[0]} {...level0.props}>
+			{#if error}
+				<Error {error} {status}/>
+			{:else}
+				${pyramid.replace(/\n/g, '\n\t\t\t\t')}
+			{/if}
+		</Layout>
+	`.replace(/^\t\t/gm, '').trim();
+}
+
+function get_file(path_to_routes: string, component: PageComponent) {
+	if (component.default) return `./${component.type}.svelte`;
+	return posixify(`${path_to_routes}/${component.file}`);
+}

src/core/create_compilers/RollupResult.ts

@@ -47,12 +47,13 @@ export default class RollupResult implements CompileResult {
 		} else {
 			for (const name in compiler.input) {
 				const file = compiler.input[name];
-				this.assets[name] = compiler.chunks.find(chunk => file in chunk.modules).fileName;
+				const chunk = compiler.chunks.find(chunk => file in chunk.modules);
+				if (chunk) this.assets[name] = chunk.fileName;
 			}
 		}
 
 		this.summary = compiler.chunks.map(chunk => {
-			const size_color = chunk.code.length > 150000 ? colors.bold.red : chunk.code.length > 50000 ? colors.bold.yellow : colors.bold.white;
+			const size_color = chunk.code.length > 150000 ? colors.bold().red : chunk.code.length > 50000 ? colors.bold().yellow : colors.bold().white;
 			const size_label = left_pad(pb(chunk.code.length), 10);
 
 			const lines = [size_color(`${size_label} ${chunk.fileName}`)];

src/core/create_compilers/WebpackResult.ts

@@ -1,6 +1,6 @@
 import format_messages from 'webpack-format-messages';
 import { CompileResult, BuildInfo, CompileError, Chunk, CssFile } from './interfaces';
-import { ManifestData, Dirs } from '../../interfaces';
+import { ManifestData, Dirs, PageComponent } from '../../interfaces';
 
 const locPattern = /\((\d+):(\d+)\)$/;
 
@@ -66,12 +66,15 @@ export default class WebpackResult implements CompileResult {
 			assets: this.assets,
 			css: {
 				main: extract_css(this.assets.main),
-				chunks: Object
+				chunks: manifest_data.components
-					.keys(this.assets)
+					.reduce((chunks: Record<string, string[]>, component: PageComponent) => {
-					.filter(chunkName => chunkName !== 'main')
+						const css_dependencies = [];
-					.reduce((chunks: { [key: string]: string }, chukName) => {
+						const css = extract_css(this.assets[component.name]);
-						const assets = this.assets[chukName];
+
-						chunks[chukName] = extract_css(assets);
+						if (css) css_dependencies.push(css);
+
+						chunks[component.file] = css_dependencies;
+
 						return chunks;
 					}, {})
 			}

src/core/create_compilers/extract_css.ts

@@ -161,6 +161,8 @@ export default function extract_css(client_result: CompileResult, components: Pa
 
 	// recursively find the chunks this component depends on
 	entry_chunk_dependencies.forEach(chunk => {
+		if (!chunk) return; // TODO why does this happen?
+
 		chunk.imports.forEach(file => {
 			entry_chunk_dependencies.add(lookup.get(file));
 		});
@@ -182,7 +184,8 @@ export default function extract_css(client_result: CompileResult, components: Pa
 
 		if (!chunk) {
 			// this should never happen!
-			throw new Error(`Could not find chunk that owns ${component.file}`);
+			return;
+			// throw new Error(`Could not find chunk that owns ${component.file}`);
 		}
 
 		const chunk_dependencies: Set<Chunk> = new Set([chunk]);
@@ -190,6 +193,8 @@ export default function extract_css(client_result: CompileResult, components: Pa
 
 		// recursively find the chunks this component depends on
 		chunk_dependencies.forEach(chunk => {
+			if (!chunk) return; // TODO why does this happen?
+
 			chunk.imports.forEach(file => {
 				chunk_dependencies.add(lookup.get(file));
 			});

src/core/create_manifest_data.ts

@@ -1,22 +1,48 @@
 import * as fs from 'fs';
 import * as path from 'path';
+import svelte from 'svelte/compiler';
 import { Page, PageComponent, ServerRoute, ManifestData } from '../interfaces';
 import { posixify, reserved_words } from '../utils';
 
+const component_extensions = ['.svelte', '.html']; // TODO make this configurable (to include e.g. .svelte.md?)
+
 export default function create_manifest_data(cwd: string): ManifestData {
 	// TODO remove in a future version
 	if (!fs.existsSync(cwd)) {
 		throw new Error(`As of Sapper 0.21, the routes/ directory should become src/routes/`);
 	}
 
+	function has_preload(file: string) {
+		const source = fs.readFileSync(path.join(cwd, file), 'utf-8');
+
+		if (/preload/.test(source)) {
+			try {
+				const { vars } = svelte.compile(source.replace(/<style\b[^>]*>[^]*?<\/style>/g, ''), { generate: false });
+				return vars.some((variable: any) => variable.module && variable.export_name === 'preload');
+			} catch (err) {}
+		}
+
+		return false;
+	}
+
 	const components: PageComponent[] = [];
 	const pages: Page[] = [];
 	const server_routes: ServerRoute[] = [];
 
 	const default_layout: PageComponent = {
 		default: true,
+		type: 'layout',
 		name: '_default_layout',
-		file: null
+		file: null,
+		has_preload: false
+	};
+
+	const default_error: PageComponent = {
+		default: true,
+		type: 'error',
+		name: '_default_error',
+		file: null,
+		has_preload: false
 	};
 
 	function walk(
@@ -43,7 +69,7 @@ export default function create_manifest_data(cwd: string): ManifestData {
 
 				const parts = get_parts(segment);
 				const is_index = is_dir ? false : basename.startsWith('index.');
-				const is_page = ext === '.html';
+				const is_page = component_extensions.indexOf(ext) !== -1;
 
 				parts.forEach(part => {
 					if (/\]\[/.test(part.content)) {
@@ -57,6 +83,7 @@ export default function create_manifest_data(cwd: string): ManifestData {
 
 				return {
 					basename,
+					ext,
 					parts,
 					file: posixify(file),
 					is_dir,
@@ -103,11 +130,15 @@ export default function create_manifest_data(cwd: string): ManifestData {
 			params.push(...item.parts.filter(p => p.dynamic).map(p => p.content));
 
 			if (item.is_dir) {
-				const index = path.join(dir, item.basename, '_layout.html');
+				const ext = component_extensions.find((ext: string) => {
+					const index = path.join(dir, item.basename, `_layout${ext}`);
+					return fs.existsSync(index);
+				});
 
-				const component = fs.existsSync(index) && {
+				const component = ext && {
 					name: `${get_slug(item.file)}__layout`,
-					file: `${item.file}/_layout.html`
+					file: `${item.file}/_layout${ext}`,
+					has_preload: has_preload(`${item.file}/_layout${ext}`)
 				};
 
 				if (component) components.push(component);
@@ -123,28 +154,26 @@ export default function create_manifest_data(cwd: string): ManifestData {
 			}
 
 			else if (item.is_page) {
+				const is_index = item.basename === `index${item.ext}`;
+
 				const component = {
 					name: get_slug(item.file),
-					file: item.file
+					file: item.file,
+					has_preload: has_preload(item.file)
 				};
 
-				const parts = stack.concat({
-					component,
-					params
-				});
-
 				components.push(component);
-				if (item.basename === 'index.html') {
+
-					pages.push({
+				const parts = (is_index && stack[stack.length - 1] === null)
-						pattern: get_pattern(parent_segments, true),
+					? stack.slice(0, -1).concat({ component, params })
-						parts
+					: stack.concat({ component, params })
-					});
+
-				} else {
+				const page = {
-					pages.push({
+					pattern: get_pattern(is_index ? parent_segments : segments, true),
-						pattern: get_pattern(segments, true),
+					parts
-						parts
+				};
-					});
+
-				}
+				pages.push(page);
 			}
 
 			else {
@@ -158,14 +187,24 @@ export default function create_manifest_data(cwd: string): ManifestData {
 		});
 	}
 
-	const root_file = path.join(cwd, '_layout.html');
+	const root_ext = component_extensions.find(ext => fs.existsSync(path.join(cwd, `_layout${ext}`)));
-	const root = fs.existsSync(root_file)
+	const root = root_ext
 		? {
 			name: 'main',
-			file: '_layout.html'
+			file: `_layout${root_ext}`,
+			has_preload: has_preload(`_layout${root_ext}`)
 		}
 		: default_layout;
 
+	const error_ext = component_extensions.find(ext => fs.existsSync(path.join(cwd, `_error${ext}`)));
+	const error = error_ext
+		? {
+			name: 'error',
+			file: `_error${error_ext}`,
+			has_preload: has_preload(`_error${error_ext}`)
+		}
+		: default_error;
+
 	walk(cwd, [], [], []);
 
 	// check for clashes
@@ -196,6 +235,7 @@ export default function create_manifest_data(cwd: string): ManifestData {
 
 	return {
 		root,
+		error,
 		components,
 		pages,
 		server_routes

src/core/create_manifests.ts

@@ -1,243 +0,0 @@
-import * as fs from 'fs';
-import * as path from 'path';
-import { posixify, stringify, walk, write_if_changed } from '../utils';
-import { Page, PageComponent, ManifestData } from '../interfaces';
-
-export function create_main_manifests({
-	bundler,
-	manifest_data,
-	dev_port,
-	dev,
-	cwd,
-	src,
-	dest,
-	routes,
-	output
-}: {
-	bundler: string,
-	manifest_data: ManifestData;
-	dev_port?: number;
-	dev: boolean;
-	cwd: string;
-	src: string;
-	dest: string;
-	routes: string;
-	output: string
-}) {
-	if (!fs.existsSync(output)) fs.mkdirSync(output);
-
-	const path_to_routes = path.relative(output, routes);
-
-	const client_manifest = generate_client(manifest_data, path_to_routes, bundler, dev, dev_port);
-	const server_manifest = generate_server(manifest_data, path_to_routes, cwd, src, dest, dev);
-
-	write_if_changed(
-		`${output}/_layout.html`,
-		`<svelte:component this={child.component} {...child.props}/>`
-	);
-	write_if_changed(`${output}/client.js`, client_manifest);
-	write_if_changed(`${output}/server.js`, server_manifest);
-}
-
-export function create_serviceworker_manifest({ manifest_data, output, client_files, static_files }: {
-	manifest_data: ManifestData;
-	output: string;
-	client_files: string[];
-	static_files: string;
-}) {
-	let files: string[] = ['/service-worker-index.html'];
-
-	if (fs.existsSync(static_files)) {
-		files = files.concat(walk(static_files));
-	} else {
-		// TODO remove in a future version
-		if (fs.existsSync('assets')) {
-			throw new Error(`As of Sapper 0.21, the assets/ directory should become static/`);
-		}
-	}
-
-	let code = `
-		// This file is generated by Sapper — do not edit it!
-		export const timestamp = ${Date.now()};
-
-		export const files = [\n\t${files.map((x: string) => stringify(x)).join(',\n\t')}\n];
-		export { files as assets }; // legacy
-
-		export const shell = [\n\t${client_files.map((x: string) => stringify(x)).join(',\n\t')}\n];
-
-		export const routes = [\n\t${manifest_data.pages.map((r: Page) => `{ pattern: ${r.pattern} }`).join(',\n\t')}\n];
-	`.replace(/^\t\t/gm, '').trim();
-
-	write_if_changed(`${output}/service-worker.js`, code);
-}
-
-function generate_client(
-	manifest_data: ManifestData,
-	path_to_routes: string,
-	bundler: string,
-	dev: boolean,
-	dev_port?: number
-) {
-	const template_file = path.resolve(__dirname, '../templates/client.js');
-	const template = fs.readFileSync(template_file, 'utf-8');
-
-	const page_ids = new Set(manifest_data.pages.map(page =>
-		page.pattern.toString()));
-
-	const server_routes_to_ignore = manifest_data.server_routes.filter(route =>
-		!page_ids.has(route.pattern.toString()));
-
-	const component_indexes: Record<string, number> = {};
-
-	const components = `[
-		${manifest_data.components.map((component, i) => {
-			const annotation = bundler === 'webpack'
-				? `/* webpackChunkName: "${component.name}" */ `
-				: '';
-
-			const source = get_file(path_to_routes, component);
-
-			component_indexes[component.name] = i;
-
-			return `{
-			js: () => import(${annotation}${stringify(source)}),
-			css: "__SAPPER_CSS_PLACEHOLDER:${stringify(component.file, false)}__"
-		}`;
-		}).join(',\n\t\t')}
-	]`.replace(/^\t/gm, '').trim();
-
-	let needs_decode = false;
-
-	let pages = `[
-		${manifest_data.pages.map(page => `{
-			// ${page.parts[page.parts.length - 1].component.file}
-			pattern: ${page.pattern},
-			parts: [
-				${page.parts.map(part => {
-					if (part === null) return 'null';
-
-					if (part.params.length > 0) {
-						needs_decode = true;
-						const props = part.params.map((param, i) => `${param}: d(match[${i + 1}])`);
-						return `{ i: ${component_indexes[part.component.name]}, params: match => ({ ${props.join(', ')} }) }`;
-					}
-
-					return `{ i: ${component_indexes[part.component.name]} }`;
-				}).join(',\n\t\t\t\t')}
-			]
-		}`).join(',\n\n\t\t')}
-	]`.replace(/^\t/gm, '').trim();
-
-	if (needs_decode) {
-		pages = `(d => ${pages})(decodeURIComponent)`
-	}
-
-	let footer = '';
-
-	if (dev) {
-		const sapper_dev_client = posixify(
-			path.resolve(__dirname, '../sapper-dev-client.js')
-		);
-
-		footer = `
-
-			if (typeof window !== 'undefined') {
-				import(${stringify(sapper_dev_client)}).then(client => {
-					client.connect(${dev_port});
-				});
-			}`.replace(/^\t{3}/gm, '');
-	}
-
-	return `// This file is generated by Sapper — do not edit it!\n` + template
-		.replace('__ROOT__', stringify(get_file(path_to_routes, manifest_data.root), false))
-		.replace('__ERROR__', stringify(posixify(`${path_to_routes}/_error.html`), false))
-		.replace('__IGNORE__', `[${server_routes_to_ignore.map(route => route.pattern).join(', ')}]`)
-		.replace('__COMPONENTS__', components)
-		.replace('__PAGES__', pages) +
-		footer;
-}
-
-function generate_server(
-	manifest_data: ManifestData,
-	path_to_routes: string,
-	cwd: string,
-	src: string,
-	dest: string,
-	dev: boolean
-) {
-	const template_file = path.resolve(__dirname, '../templates/server.js');
-	const template = fs.readFileSync(template_file, 'utf-8');
-
-	const imports = [].concat(
-		manifest_data.server_routes.map(route =>
-			`import * as __${route.name} from ${stringify(posixify(`${path_to_routes}/${route.file}`))};`),
-		manifest_data.components.map(component =>
-			`import __${component.name} from ${stringify(get_file(path_to_routes, component))};`),
-		`import root from ${stringify(get_file(path_to_routes, manifest_data.root))};`,
-		`import error from ${stringify(posixify(`${path_to_routes}/_error.html`))};`
-	);
-
-	let code = `
-		${imports.join('\n')}
-
-		const d = decodeURIComponent;
-
-		export const manifest = {
-			server_routes: [
-				${manifest_data.server_routes.map(route => `{
-					// ${route.file}
-					pattern: ${route.pattern},
-					handlers: __${route.name},
-					params: ${route.params.length > 0
-						? `match => ({ ${route.params.map((param, i) => `${param}: d(match[${i + 1}])`).join(', ')} })`
-						: `() => ({})`}
-				}`).join(',\n\n\t\t\t\t')}
-			],
-
-			pages: [
-				${manifest_data.pages.map(page => `{
-					// ${page.parts[page.parts.length - 1].component.file}
-					pattern: ${page.pattern},
-					parts: [
-						${page.parts.map(part => {
-							if (part === null) return 'null';
-
-							const props = [
-								`name: "${part.component.name}"`,
-								`file: ${stringify(part.component.file)}`,
-								`component: __${part.component.name}`
-							];
-
-							if (part.params.length > 0) {
-								const params = part.params.map((param, i) => `${param}: d(match[${i + 1}])`);
-								props.push(`params: match => ({ ${params.join(', ')} })`);
-							}
-
-							return `{ ${props.join(', ')} }`;
-						}).join(',\n\t\t\t\t\t\t')}
-					]
-				}`).join(',\n\n\t\t\t\t')}
-			],
-
-			root,
-
-			error
-		};`.replace(/^\t\t/gm, '').trim();
-
-	const build_dir = posixify(path.relative(cwd, dest));
-	const src_dir = posixify(path.relative(cwd, src));
-
-	return `// This file is generated by Sapper — do not edit it!\n` + template
-		.replace('__BUILD__DIR__', JSON.stringify(build_dir))
-		.replace('__SRC__DIR__', JSON.stringify(src_dir))
-		.replace('__DEV__', dev ? 'true' : 'false')
-		.replace(/const manifest = __MANIFEST__;/, code);
-}
-
-function get_file(path_to_routes: string, component: PageComponent) {
-	if (component.default) {
-		return `./_layout.html`;
-	}
-
-	return posixify(`${path_to_routes}/${component.file}`);
-}

src/interfaces.ts

@@ -19,14 +19,18 @@ export type Template = {
 	stream: (req, res, data: Record<string, string | Promise<string>>) => void;
 };
 
-export type Store = {
+export type WritableStore<T> = {
-	get: () => any;
+	set: (value: T) => void;
+	update: (fn: (value: T) => T) => void;
+	subscribe: (fn: (T: any) => void) => () => void;
 };
 
 export type PageComponent = {
 	default?: boolean;
+	type?: string;
 	name: string;
 	file: string;
+	has_preload: boolean;
 };
 
 export type Page = {
@@ -52,6 +56,7 @@ export type Dirs = {
 
 export type ManifestData = {
 	root: PageComponent;
+	error: PageComponent;
 	components: PageComponent[];
 	pages: Page[];
 	server_routes: ServerRoute[];
@@ -64,7 +69,7 @@ export type ReadyEvent = {
 
 export type ErrorEvent = {
 	type: string;
-	message: string;
+	error: Error;
 };
 
 export type FatalEvent = {

src/types.d.ts

@@ -0,0 +1 @@
+declare module 'svelte/compiler';

templates/src/client/app.ts

@@ -1,389 +0,0 @@
-import RootComponent from '__ROOT__';
-import ErrorComponent from '__ERROR__';
-import {
-	Target,
-	ScrollPosition,
-	Component,
-	Redirect,
-	ComponentLoader,
-	ComponentConstructor,
-	RootProps,
-	Page
-} from './types';
-import goto from './goto';
-
-const ignore = __IGNORE__;
-export const components: ComponentLoader[] = __COMPONENTS__;
-export const pages: Page[] = __PAGES__;
-
-let ready = false;
-let root_component: Component;
-let segments: string[] = [];
-let current_token: {};
-let root_preload: Promise<any>;
-let root_data: any;
-
-const root_props: RootProps = {
-	path: null,
-	params: null,
-	query: null,
-	child: {
-		segment: null,
-		component: null,
-		props: {}
-	}
-};
-
-export let prefetching: {
-	href: string;
-	promise: Promise<{ redirect?: Redirect, data?: any, nullable_depth?: number }>;
-} = null;
-export function set_prefetching(href, promise) {
-	prefetching = { href, promise };
-}
-
-export let store;
-export function set_store(fn) {
-	store = fn(initial_data.store);
-}
-
-export let target: Node;
-export function set_target(element) {
-	target = element;
-}
-
-export let uid = 1;
-export function set_uid(n) {
-	uid = n;
-}
-
-export let cid: number;
-export function set_cid(n) {
-	cid = n;
-}
-
-export const initial_data = typeof __SAPPER__ !== 'undefined' && __SAPPER__;
-
-const _history = typeof history !== 'undefined' ? history : {
-	pushState: (state: any, title: string, href: string) => {},
-	replaceState: (state: any, title: string, href: string) => {},
-	scrollRestoration: ''
-};
-export { _history as history };
-
-export const scroll_history: Record<string, ScrollPosition> = {};
-
-export function select_route(url: URL): Target {
-	if (url.origin !== location.origin) return null;
-	if (!url.pathname.startsWith(initial_data.baseUrl)) return null;
-
-	const path = url.pathname.slice(initial_data.baseUrl.length);
-
-	// avoid accidental clashes between server routes and pages
-	if (ignore.some(pattern => pattern.test(path))) return;
-
-	for (let i = 0; i < pages.length; i += 1) {
-		const page = pages[i];
-
-		const match = page.pattern.exec(path);
-		if (match) {
-			const query: Record<string, string | string[]> = Object.create(null);
-			if (url.search.length > 0) {
-				url.search.slice(1).split('&').forEach(searchParam => {
-					let [, key, value] = /([^=]*)(?:=(.*))?/.exec(decodeURIComponent(searchParam));
-					value = (value || '').replace(/\+/g, ' ');
-					if (typeof query[key] === 'string') query[key] = [<string>query[key]];
-					if (typeof query[key] === 'object') query[key].push(value);
-					else query[key] = value;
-				});
-			}
-			return { url, path, page, match, query };
-		}
-	}
-}
-
-export function scroll_state() {
-	return {
-		x: pageXOffset,
-		y: pageYOffset
-	};
-}
-
-export function navigate(target: Target, id: number, noscroll?: boolean, hash?: string): Promise<any> {
-	let scroll: ScrollPosition;
-	if (id) {
-		// popstate or initial navigation
-		cid = id;
-	} else {
-		const current_scroll = scroll_state();
-
-		// clicked on a link. preserve scroll state
-		scroll_history[cid] = current_scroll;
-
-		id = cid = ++uid;
-		scroll_history[cid] = noscroll ? current_scroll : { x: 0, y: 0 };
-	}
-
-	cid = id;
-
-	if (root_component) {
-		root_component.set({ preloading: true });
-	}
-	const loaded = prefetching && prefetching.href === target.url.href ?
-		prefetching.promise :
-		prepare_page(target);
-
-	prefetching = null;
-
-	const token = current_token = {};
-
-	return loaded.then(({ redirect, data, nullable_depth }) => {
-		if (redirect) {
-			return goto(redirect.location, { replaceState: true });
-		}
-		render(data, nullable_depth, scroll_history[id], noscroll, hash, token);
-		if (document.activeElement) document.activeElement.blur();
-	});
-}
-
-function render(data: any, nullable_depth: number, scroll: ScrollPosition, noscroll: boolean, hash: string, token: {}) {
-	if (current_token !== token) return;
-
-	if (root_component) {
-		// first, clear out highest-level root component
-		let level = data.child;
-		for (let i = 0; i < nullable_depth; i += 1) {
-			if (i === nullable_depth) break;
-			level = level.props.child;
-		}
-
-		const { component } = level;
-		level.component = null;
-		root_component.set({ child: data.child });
-
-		// then render new stuff
-		level.component = component;
-		root_component.set(data);
-	} else {
-		// first load — remove SSR'd <head> contents
-		const start = document.querySelector('#sapper-head-start');
-		const end = document.querySelector('#sapper-head-end');
-
-		if (start && end) {
-			while (start.nextSibling !== end) detach(start.nextSibling);
-			detach(start);
-			detach(end);
-		}
-
-		Object.assign(data, root_data);
-
-		root_component = new RootComponent({
-			target,
-			data,
-			store,
-			hydrate: true
-		});
-	}
-
-	if (!noscroll) {
-		if (hash) {
-			// scroll is an element id (from a hash), we need to compute y.
-			const deep_linked = document.querySelector(hash);
-			if (deep_linked) {
-				scroll = {
-					x: 0,
-					y: deep_linked.getBoundingClientRect().top
-				};
-			}
-		}
-
-		scroll_history[cid] = scroll;
-		if (scroll) scrollTo(scroll.x, scroll.y);
-	}
-
-	Object.assign(root_props, data);
-	ready = true;
-}
-
-export function prepare_page(target: Target): Promise<{
-	redirect?: Redirect;
-	data?: any;
-	nullable_depth?: number;
-}> {
-	const { page, path, query } = target;
-	const new_segments = path.split('/').filter(Boolean);
-	let changed_from = 0;
-
-	while (
-		segments[changed_from] &&
-		new_segments[changed_from] &&
-		segments[changed_from] === new_segments[changed_from]
-	) changed_from += 1;
-
-	let redirect: Redirect = null;
-	let error: { statusCode: number, message: Error | string } = null;
-
-	const preload_context = {
-		store,
-		fetch: (url: string, opts?: any) => fetch(url, opts),
-		redirect: (statusCode: number, location: string) => {
-			if (redirect && (redirect.statusCode !== statusCode || redirect.location !== location)) {
-				throw new Error(`Conflicting redirects`);
-			}
-			redirect = { statusCode, location };
-		},
-		error: (statusCode: number, message: Error | string) => {
-			error = { statusCode, message };
-		}
-	};
-
-	if (!root_preload) {
-		root_preload = RootComponent.preload
-			? initial_data.preloaded[0] || RootComponent.preload.call(preload_context, {
-				path,
-				query,
-				params: {}
-			})
-			: {};
-	}
-
-	return Promise.all(page.parts.map((part, i) => {
-		if (i < changed_from) return null;
-		if (!part) return null;
-
-		return load_component(components[part.i]).then(Component => {
-			const req = {
-				path,
-				query,
-				params: part.params ? part.params(target.match) : {}
-			};
-
-			let preloaded;
-			if (ready || !initial_data.preloaded[i + 1]) {
-				preloaded = Component.preload
-					? Component.preload.call(preload_context, req)
-					: {};
-			} else {
-				preloaded = initial_data.preloaded[i + 1];
-			}
-
-			return Promise.resolve(preloaded).then(preloaded => {
-				return { Component, preloaded };
-			});
-		});
-	})).catch(err => {
-		error = { statusCode: 500, message: err };
-		return [];
-	}).then(results => {
-		if (root_data) {
-			return results;
-		} else {
-			return Promise.resolve(root_preload).then(value => {
-				root_data = value;
-				return results;
-			});
-		}
-	}).then(results => {
-		if (redirect) {
-			return { redirect };
-		}
-
-		segments = new_segments;
-
-		const get_params = page.parts[page.parts.length - 1].params || (() => ({}));
-		const params = get_params(target.match);
-
-		if (error) {
-			const props = {
-				path,
-				query,
-				params,
-				error: typeof error.message === 'string' ? new Error(error.message) : error.message,
-				status: error.statusCode
-			};
-
-			return {
-				data: Object.assign({}, props, {
-					preloading: false,
-					child: {
-						component: ErrorComponent,
-						props
-					}
-				})
-			};
-		}
-
-		const props = { path, query, error: null, status: null };
-		const data = {
-			path,
-			preloading: false,
-			child: Object.assign({}, root_props.child, {
-				segment: segments[0]
-			})
-		};
-		if (changed(query, root_props.query)) data.query = query;
-		if (changed(params, root_props.params)) data.params = params;
-
-		let level = data.child;
-		let nullable_depth = 0;
-
-		for (let i = 0; i < page.parts.length; i += 1) {
-			const part = page.parts[i];
-			if (!part) continue;
-
-			const get_params = part.params || (() => ({}));
-
-			if (i < changed_from) {
-				level.props.path = path;
-				level.props.query = query;
-				level.props.child = Object.assign({}, level.props.child);
-
-				nullable_depth += 1;
-			} else {
-				level.component = results[i].Component;
-				level.props = Object.assign({}, level.props, props, {
-					params: get_params(target.match),
-				}, results[i].preloaded);
-
-				level.props.child = {};
-			}
-
-			level = level.props.child;
-			level.segment = segments[i + 1];
-		}
-
-		return { data, nullable_depth };
-	});
-}
-
-function load_css(chunk: string) {
-	const href = `client/${chunk}`;
-	if (document.querySelector(`link[href="${href}"]`)) return;
-
-	return new Promise((fulfil, reject) => {
-		const link = document.createElement('link');
-		link.rel = 'stylesheet';
-		link.href = href;
-
-		link.onload = () => fulfil();
-		link.onerror = reject;
-
-		document.head.appendChild(link);
-	});
-}
-
-export function load_component(component: ComponentLoader): Promise<ComponentConstructor> {
-	// TODO this is temporary — once placeholders are
-	// always rewritten, scratch the ternary
-	const promises: Array<Promise<any>> = (typeof component.css === 'string' ? [] : component.css.map(load_css));
-	promises.unshift(component.js());
-	return Promise.all(promises).then(values => values[0].default);
-}
-
-function detach(node: Node) {
-	node.parentNode.removeChild(node);
-}
-
-function changed(a: Record<string, string | true>, b: Record<string, string | true>) {
-	return JSON.stringify(a) !== JSON.stringify(b);
-}

templates/src/client/index.ts

@@ -1,4 +0,0 @@
-export { default as start } from './start/index';
-export { default as goto } from './goto/index';
-export { default as prefetch } from './prefetch/index';
-export { default as prefetchRoutes } from './prefetchRoutes/index';

templates/src/client/prefetch/index.ts

@@ -1,14 +0,0 @@
-import { select_route, prefetching, set_prefetching, prepare_page } from '../app';
-import { Target } from '../types';
-
-export default function prefetch(href: string) {
-	const target: Target = select_route(new URL(href, document.baseURI));
-
-	if (target) {
-		if (!prefetching || href !== prefetching.href) {
-			set_prefetching(href, prepare_page(target));
-		}
-
-		return prefetching.promise;
-	}
-}

templates/src/server/placeholders.ts

@@ -1,11 +0,0 @@
-import { Manifest } from './types';
-
-export const manifest: Manifest = __MANIFEST__;
-
-export const build_dir = __BUILD__DIR__;
-
-export const src_dir = __SRC__DIR__;
-
-export const dev = __DEV__;
-
-export const IGNORE = '__SAPPER__IGNORE__';

test/apps/AppRunner.ts

@@ -1,5 +1,5 @@
 import * as path from 'path';
-import * as puppeteer from 'puppeteer';
+import puppeteer from 'puppeteer';
 import * as ports from 'port-authority';
 import { fork, ChildProcess } from 'child_process';
 
@@ -64,11 +64,11 @@ export class AppRunner {
 			base: `http://localhost:${this.port}`,
 
 			// helpers
-			start: () => this.page.evaluate(() => start()),
+			start: () => this.page.evaluate(() => start()).then(() => void 0),
-			prefetchRoutes: () => this.page.evaluate(() => prefetchRoutes()),
+			prefetchRoutes: () => this.page.evaluate(() => prefetchRoutes()).then(() => void 0),
-			prefetch: (href: string) => this.page.evaluate((href: string) => prefetch(href), href),
+			prefetch: (href: string) => this.page.evaluate((href: string) => prefetch(href), href).then(() => void 0),
-			goto: (href: string) => this.page.evaluate((href: string) => goto(href), href),
+			goto: (href: string) => this.page.evaluate((href: string) => goto(href), href).then(() => void 0),
-			title: () => this.page.$eval('h1', node => node.textContent)
+			title: () => this.page.$eval('h1', node => node.textContent).then(serializable => String(serializable))
 		};
 	}
 

test/apps/basics/rollup.config.js

@@ -22,10 +22,7 @@ export default {
 				emitCss: true
 			}),
 			resolve()
-		],
+		]
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	server: {
@@ -44,10 +41,7 @@ export default {
 				preferBuiltins: true
 			})
 		],
-		external: ['sirv', 'polka'],
+		external: ['sirv', 'polka']
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	serviceworker: {

test/apps/basics/src/client.js

@@ -1,4 +1,4 @@
-import * as sapper from '../__sapper__/client.js';
+import * as sapper from '@sapper/app';
 
 window.start = () => sapper.start({
 	target: document.querySelector('#sapper')

test/apps/basics/src/routes/[slug].svelte

@@ -0,0 +1,5 @@
+<script>
+	import { page } from '@sapper/app';
+</script>
+
+<h1>{$page.params.slug.toUpperCase()}</h1>

test/apps/basics/src/routes/b/index.html

@@ -1,11 +0,0 @@
-<h1>{letter}</h1>
-
-<script>
-	export default {
-		preload() {
-			return this.fetch('b.json').then(r => r.json()).then(letter => {
-				return { letter };
-			});
-		}
-	};
-</script>

test/apps/basics/src/routes/b/index.svelte

@@ -0,0 +1,13 @@
+<script context="module">
+	export function preload() {
+		return this.fetch('b.json').then(r => r.json()).then(letter => {
+			return { letter };
+		});
+	}
+</script>
+
+<script>
+	export let letter;
+</script>
+
+<h1>{letter}</h1>

test/apps/basics/src/routes/delete-test/index.html

@@ -1,19 +0,0 @@
-<button class='del' on:click='del()'>delete</button>
-
-<script>
-	export default {
-		oncreate() {
-			window.deleted = null;
-		},
-
-		methods: {
-			del() {
-				fetch(`delete-test/42.json`, { method: 'DELETE' })
-					.then(r => r.json())
-					.then(data => {
-						window.deleted = data;
-					});
-			}
-		}
-	};
-</script>

test/apps/basics/src/routes/delete-test/index.svelte

@@ -0,0 +1,17 @@
+<script>
+	import { onMount } from 'svelte';
+
+	onMount(() => {
+		window.deleted = null;
+	});
+
+	function del() {
+		fetch(`delete-test/42.json`, { method: 'DELETE' })
+			.then(r => r.json())
+			.then(data => {
+				window.deleted = data;
+			});
+	}
+</script>
+
+<button class="del" on:click={del}>delete</button>

test/apps/basics/src/routes/dirs/bar/[a].svelte

@@ -0,0 +1,3 @@
+<h1>A page</h1>
+
+<a href="dirs/foo/xyz">same segment</a>

test/apps/basics/src/routes/dirs/bar/index.svelte

@@ -0,0 +1 @@
+<h1>bar</h1>

test/apps/basics/src/routes/dirs/foo/[b].svelte

@@ -0,0 +1 @@
+<h1>B page</h1>

test/apps/basics/src/routes/dirs/foo/index.svelte

@@ -0,0 +1,2 @@
+<h1>foo</h1>
+<a href="dirs/bar">bar</a>

test/apps/basics/src/routes/echo-query/index.html

@@ -1 +0,0 @@
-<h1>{JSON.stringify(query)}</h1>

test/apps/basics/src/routes/echo-query/index.svelte

@@ -0,0 +1,5 @@
+<script>
+	import { page } from '@sapper/app';
+</script>
+
+<h1>{JSON.stringify($page.query)}</h1>

test/apps/basics/src/routes/middleware/index.js

@@ -0,0 +1,8 @@
+export function get(req, res, next) {
+	if (req.headers.accept === 'application/json') {
+		res.end('{"json":true}');
+		return;
+	}
+
+	next();
+}

test/apps/basics/src/routes/middleware/index.svelte

@@ -0,0 +1 @@
+<h1>HTML</h1>

test/apps/basics/src/routes/unsafe-replacement.html

@@ -1,9 +0,0 @@
-$&
-
-<script>
-	export default {
-		preload() {
-			return '$&';
-		}
-	};
-</script>

test/apps/basics/src/routes/unsafe-replacement.svelte

@@ -0,0 +1,7 @@
+<script context="module">
+	export function preload() {
+		return '$&';
+	}
+</script>
+
+$&

test/apps/basics/src/server.js

@@ -1,5 +1,5 @@
 import polka from 'polka';
-import * as sapper from '../__sapper__/server.js';
+import * as sapper from '@sapper/server';
 
 const { PORT } = process.env;
 

test/apps/basics/src/service-worker.js

@@ -1,10 +1,10 @@
-import { timestamp, files, shell, routes } from '../__sapper__/service-worker.js';
+import * as sapper from '@sapper/service-worker';
 
-const ASSETS = `cache${timestamp}`;
+const ASSETS = `cache${sapper.timestamp}`;
 
-// `shell` is an array of all the files generated by webpack,
+// `app.shell` is an array of all the files generated by webpack,
-// `files` is an array of everything in the `static` directory
+// `app.files` is an array of everything in the `static` directory
-const to_cache = shell.concat(ASSETS);
+const to_cache = sapper.shell.concat(sapper.files);
 const cached = new Set(to_cache);
 
 self.addEventListener('install', event => {
@@ -52,7 +52,6 @@ self.addEventListener('fetch', event => {
 	// 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;
 	}
@@ -65,7 +64,7 @@ self.addEventListener('fetch', event => {
 	// might prefer a cache-first approach to a network-first one.)
 	event.respondWith(
 		caches
-			.open(`offline${timestamp}`)
+			.open(`offline${sapper.timestamp}`)
 			.then(async cache => {
 				try {
 					const response = await fetch(event.request);

test/apps/basics/test.ts

@@ -8,6 +8,25 @@ import { wait } from '../../utils';
 declare let deleted: { id: number };
 declare let el: any;
 
+function get(url: string, opts?: any): Promise<{ headers: Record<string, string>, body: string }> {
+	return new Promise((fulfil, reject) => {
+		const req = http.get(url, opts || {}, res => {
+			res.on('error', reject);
+
+			let body = '';
+			res.on('data', chunk => body += chunk);
+			res.on('end', () => {
+				fulfil({
+					headers: res.headers as Record<string, string>,
+					body
+				});
+			});
+		});
+
+		req.on('error', reject);
+	});
+}
+
 describe('basics', function() {
 	this.timeout(10000);
 
@@ -20,19 +39,18 @@ describe('basics', function() {
 	let prefetchRoutes: () => Promise<void>;
 	let prefetch: (href: string) => Promise<void>;
 	let goto: (href: string) => Promise<void>;
+	let title: () => Promise<string>;
 
 	// hooks
 	before(async () => {
 		await build({ cwd: __dirname });
 
 		runner = new AppRunner(__dirname, '__sapper__/build/server/server.js');
-		({ base, page, start, prefetchRoutes, prefetch, goto } = await runner.start());
+		({ base, page, start, prefetchRoutes, prefetch, goto, title } = await runner.start());
 	});
 
 	after(() => runner.end());
 
-	const title = () => page.$eval('h1', node => node.textContent);
-
 	it('serves /', async () => {
 		await page.goto(base);
 
@@ -117,38 +135,25 @@ describe('basics', function() {
 		assert.equal(requests[1], `${base}/b.json`);
 	});
 
-
 	// TODO equivalent test for a webpack app
-	it('sets Content-Type, Link...modulepreload, and Cache-Control headers', () => {
+	it('sets Content-Type, Link...modulepreload, and Cache-Control headers', async () => {
-		return new Promise((fulfil, reject) => {
+		const { headers } = await get(base);
-			const req = http.get(base, res => {
-				try {
-					const { headers } = res;
 
-					assert.equal(
+		assert.equal(
-						headers['content-type'],
+			headers['content-type'],
-						'text/html'
+			'text/html'
-					);
+		);
 
-					assert.equal(
+		assert.equal(
-						headers['cache-control'],
+			headers['cache-control'],
-						'max-age=600'
+			'max-age=600'
-					);
+		);
 
-					// TODO preload more than just the entry point
+		// TODO preload more than just the entry point
-					const regex = /<\/client\/client\.\w+\.js>;rel="modulepreload"/;
+		const regex = /<\/client\/client\.\w+\.js>;rel="modulepreload"/;
-					const link = <string>headers['link'];
+		const link = <string>headers['link'];
 
-					assert.ok(regex.test(link), link);
+		assert.ok(regex.test(link), link);
-
-					fulfil();
-				} catch (err) {
-					reject(err);
-				}
-			});
-
-			req.on('error', reject);
-		});
 	});
 
 	it('calls a delete handler', async () => {
@@ -262,7 +267,43 @@ describe('basics', function() {
 		await page.goto(`${base}/unsafe-replacement`);
 		await start();
 
-		const html = await page.evaluate(() => document.body.innerHTML);
+		const html = String(await page.evaluate(() => document.body.innerHTML));
 		assert.equal(html.indexOf('%sapper'), -1);
 	});
+
+	it('navigates between routes with empty parts', async () => {
+		await page.goto(`${base}/dirs/foo`);
+		await start();
+
+		assert.equal(await title(), 'foo');
+
+		await page.click('[href="dirs/bar"]');
+		await wait(50);
+		assert.equal(await title(), 'bar');
+	});
+
+	it('navigates between dynamic routes with same segments', async () => {
+		await page.goto(`${base}/dirs/bar/xyz`);
+		await start();
+
+		assert.equal(await title(), 'A page');
+
+		await page.click('[href="dirs/foo/xyz"]');
+		await wait(50);
+		assert.equal(await title(), 'B page');
+	});
+  
+	it('runs server route handlers before page handlers, if they match', async () => {
+		const json = await get(`${base}/middleware`, {
+			headers: {
+				'Accept': 'application/json'
+			}
+		});
+
+		assert.equal(json.body, '{"json":true}');
+
+		const html = await get(`${base}/middleware`);
+
+		assert.ok(html.body.indexOf('<h1>HTML</h1>') !== -1);
+	});
 });

test/apps/credentials/rollup.config.js

@@ -22,10 +22,7 @@ export default {
 				emitCss: true
 			}),
 			resolve()
-		],
+		]
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	server: {
@@ -44,10 +41,7 @@ export default {
 				preferBuiltins: true
 			})
 		],
-		external: ['sirv', 'polka', 'cookie'],
+		external: ['sirv', 'polka', 'cookie']
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	serviceworker: {

test/apps/credentials/src/client.js

@@ -1,4 +1,4 @@
-import * as sapper from '../__sapper__/client.js';
+import * as sapper from '@sapper/app';
 
 window.start = () => sapper.start({
 	target: document.querySelector('#sapper')

test/apps/credentials/src/routes/credentials/index.html

@@ -1,11 +1,13 @@
-<h1>{message}</h1>
+<script context="module">
+	export function preload({ query }) {
+		return this.fetch(`credentials/test.json`, {
+			credentials: query.creds
+		}).then(r => r.json());
+	}
+</script>
 
 <script>
-	export default {
+	export let message;
-		preload({ query }) {
-			return this.fetch(`credentials/test.json`, {
-				credentials: query.creds
-			}).then(r => r.json());
-		}
-	};
 </script>
+
+<h1>{message}</h1>

test/apps/credentials/src/server.js

@@ -1,5 +1,5 @@
 import polka from 'polka';
-import * as sapper from '../__sapper__/server.js';
+import * as sapper from '@sapper/server';
 
 const { PORT } = process.env;
 

test/apps/credentials/src/service-worker.js

@@ -1,10 +1,10 @@
-import { timestamp, files, shell, routes } from '../__sapper__/service-worker.js';
+import * as sapper from '@sapper/service-worker';
 
-const ASSETS = `cache${timestamp}`;
+const ASSETS = `cache${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 = shell.concat(ASSETS);
+const to_cache = sapper.shell.concat(sapper.files);
 const cached = new Set(to_cache);
 
 self.addEventListener('install', event => {
@@ -65,7 +65,7 @@ self.addEventListener('fetch', event => {
 	// might prefer a cache-first approach to a network-first one.)
 	event.respondWith(
 		caches
-			.open(`offline${timestamp}`)
+			.open(`offline${sapper.timestamp}`)
 			.then(async cache => {
 				try {
 					const response = await fetch(event.request);

test/apps/css/rollup.config.js

@@ -22,10 +22,7 @@ export default {
 				emitCss: true
 			}),
 			resolve()
-		],
+		]
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	server: {
@@ -44,10 +41,7 @@ export default {
 				preferBuiltins: true
 			})
 		],
-		external: ['sirv', 'polka'],
+		external: ['sirv', 'polka']
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	serviceworker: {

test/apps/css/src/client.js

@@ -1,4 +1,4 @@
-import * as sapper from '../__sapper__/client.js';
+import * as sapper from '@sapper/app';
 
 window.start = () => sapper.start({
 	target: document.querySelector('#sapper')

test/apps/css/src/routes/bar.html

@@ -1,11 +0,0 @@
-<svelte:component this={Title}/>
-
-<script>
-	export default {
-		oncreate() {
-			import('./_components/Title.html').then(({ default: Title }) => {
-				this.set({ Title });
-			});
-		}
-	};
-</script>

test/apps/css/src/routes/bar.svelte

@@ -0,0 +1,13 @@
+<script>
+	import { onMount } from 'svelte';
+
+	export let Title;
+
+	onMount(() => {
+		import('./_components/Title.svelte').then(mod => {
+			Title = mod.default;
+		});
+	});
+</script>
+
+<svelte:component this={Title}/>

test/apps/css/src/server.js

@@ -1,5 +1,5 @@
 import polka from 'polka';
-import * as sapper from '../__sapper__/server.js';
+import * as sapper from '@sapper/server';
 
 const { PORT } = process.env;
 

test/apps/css/src/service-worker.js

@@ -1,10 +1,10 @@
-import { timestamp, files, shell, routes } from '../__sapper__/service-worker.js';
+import * as sapper from '@sapper/service-worker';
 
-const ASSETS = `cache${timestamp}`;
+const ASSETS = `cache${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 = shell.concat(ASSETS);
+const to_cache = sapper.shell.concat(sapper.files);
 const cached = new Set(to_cache);
 
 self.addEventListener('install', event => {
@@ -65,7 +65,7 @@ self.addEventListener('fetch', event => {
 	// might prefer a cache-first approach to a network-first one.)
 	event.respondWith(
 		caches
-			.open(`offline${timestamp}`)
+			.open(`offline${sapper.timestamp}`)
 			.then(async cache => {
 				try {
 					const response = await fetch(event.request);

test/apps/encoding/rollup.config.js

@@ -22,10 +22,7 @@ export default {
 				emitCss: true
 			}),
 			resolve()
-		],
+		]
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	server: {
@@ -44,10 +41,7 @@ export default {
 				preferBuiltins: true
 			})
 		],
-		external: ['sirv', 'polka'],
+		external: ['sirv', 'polka']
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	serviceworker: {

test/apps/encoding/src/client.js

@@ -1,4 +1,4 @@
-import * as sapper from '../__sapper__/client.js';
+import * as sapper from '@sapper/app';
 
 window.start = () => sapper.start({
 	target: document.querySelector('#sapper')

test/apps/encoding/src/routes/echo/page/[slug].html

@@ -1,11 +1,14 @@
-<h1>{slug} {JSON.stringify(query)}</h1>
+<script context="module">
+	export function preload({ params }) {
+		return {
+			slug: params.slug
+		};
+	}
+</script>
 
 <script>
-	export default {
+	import { page } from '@sapper/app';
-		preload({ params }) {
+	export let slug;
-			return {
-				slug: params.slug
-			};
-		}
-	};
 </script>
+
+<h1>{slug} {JSON.stringify($page.query)}</h1>

test/apps/encoding/src/routes/fünke.html

@@ -1,11 +1,13 @@
-<h1>{phrase}</h1>
+<script context="module">
+	export function preload() {
+		return this.fetch('fünke.json').then(r => r.json()).then(phrase => {
+			return { phrase };
+		});
+	}
+</script>
 
 <script>
-	export default {
+	export let phrase;
-		preload() {
-			return this.fetch('fünke.json').then(r => r.json()).then(phrase => {
-				return { phrase };
-			});
-		}
-	};
 </script>
+
+<h1>{phrase}</h1>

test/apps/encoding/src/server.js

@@ -1,5 +1,5 @@
 import polka from 'polka';
-import * as sapper from '../__sapper__/server.js';
+import * as sapper from '@sapper/server';
 
 const { PORT } = process.env;
 

test/apps/encoding/src/service-worker.js

@@ -1,10 +1,10 @@
-import { timestamp, files, shell, routes } from '../__sapper__/service-worker.js';
+import * as sapper from '@sapper/service-worker';
 
-const ASSETS = `cache${timestamp}`;
+const ASSETS = `cache${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 = shell.concat(ASSETS);
+const to_cache = sapper.shell.concat(sapper.files);
 const cached = new Set(to_cache);
 
 self.addEventListener('install', event => {
@@ -65,7 +65,7 @@ self.addEventListener('fetch', event => {
 	// might prefer a cache-first approach to a network-first one.)
 	event.respondWith(
 		caches
-			.open(`offline${timestamp}`)
+			.open(`offline${sapper.timestamp}`)
 			.then(async cache => {
 				try {
 					const response = await fetch(event.request);

test/apps/errors/rollup.config.js

@@ -22,10 +22,7 @@ export default {
 				emitCss: true
 			}),
 			resolve()
-		],
+		]
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	server: {
@@ -44,10 +41,7 @@ export default {
 				preferBuiltins: true
 			})
 		],
-		external: ['sirv', 'polka'],
+		external: ['sirv', 'polka']
-
-		// temporary, pending Rollup 1.0
-		experimentalCodeSplitting: true
 	},
 
 	serviceworker: {

test/apps/errors/src/client.js

@@ -1,4 +1,4 @@
-import * as sapper from '../__sapper__/client.js';
+import * as sapper from '@sapper/app';
 
 window.start = () => sapper.start({
 	target: document.querySelector('#sapper')

test/apps/errors/src/routes/_error.svelte

@@ -0,0 +1,17 @@
+<script>
+	import { onMount, onDestroy } from 'svelte';
+
+	export let status, error = {};
+
+	let mounted = false;
+
+	onMount(() => {
+		mounted = 'success';
+	})
+</script>
+
+<h1>{status}</h1>
+
+<h2>{mounted}</h2>
+
+<p>{error.message}</p>

test/apps/errors/src/routes/blog/[slug].html

@@ -1,19 +1,21 @@
-<h1>{post.title}</h1>
+<script context="module">
+	export function preload({ params }) {
+		const { slug } = params;
+
+		return this.fetch(`blog/${slug}.json`).then(r => {
+			return r.json().then(data => {
+				if (r.status !== 200) {
+					this.error(r.status, data);
+				}
+
+				return data;
+			});
+		});
+	}
+</script>
 
 <script>
-	export default {
+	export let post;
-		preload({ params }) {
-			const { slug } = params;
-
-			return this.fetch(`blog/${slug}.json`).then(r => {
-				return r.json().then(data => {
-					if (r.status !== 200) {
-						this.error(r.status, data);
-					}
-
-					return data;
-				});
-			});
-		}
-	};
 </script>
+
+<h1>{post.title}</h1>

test/apps/errors/src/routes/enhance-your-calm.html

@@ -1,7 +0,0 @@
-<script>
-	export default {
-		preload() {
-			this.error(420, 'Enhance your calm');
-		}
-	};
-</script>

test/apps/errors/src/routes/enhance-your-calm.svelte

@@ -0,0 +1,5 @@
+<script context="module">
+	export function preload() {
+		this.error(420, 'Enhance your calm');
+	}
+</script>