-> v0.4.0

Serialize preloaded data for initial page and serve to client

.travis.yml

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

CHANGELOG.md

@@ -1,5 +1,17 @@
 # sapper changelog
 
+## 0.4.0
+
+* `%sapper.main%` has been replaced with `%sapper.scripts%` ([#86](https://github.com/sveltejs/sapper/issues/86))
+* Node 6 support ([#67](https://github.com/sveltejs/sapper/pull/67))
+* Explicitly load css-loader and style-loader ([#72](https://github.com/sveltejs/sapper/pull/72))
+* DELETE requests are handled with `del` exports ([#77](https://github.com/sveltejs/sapper/issues/77))
+* Send preloaded data for first route to client, where possible ([#3](https://github.com/sveltejs/sapper/issues/3))
+
+## 0.3.2
+
+* Expose `prefetch` function ([#61](https://github.com/sveltejs/sapper/pull/61))
+
 ## 0.3.1
 
 * Fix missing `runtime.js`

LICENSE

@@ -0,0 +1,9 @@
+Copyright (c) 2017 [these people](https://github.com/sveltejs/sapper/graphs/contributors).
+
+Permission is hereby granted by the authors of this software, to any person, to use the software for any purpose, free of charge, including the rights to run, read, copy, change, distribute and sell it, and including usage rights to any patents the authors may hold on it, subject to the following conditions:
+
+This license, or a link to its text, must be included with all copies of the software and any derivative works.
+
+Any modification to the software submitted to the authors may be incorporated into the software under the terms of this license.
+
+The software is provided "as is", without warranty of any kind, including but not limited to the warranties of title, fitness, merchantability and non-infringement. The authors have no obligation to provide support or updates for the software, and may not be held liable for any damages, claims or other liability arising from its use.

README.md

@@ -1,150 +1,37 @@
 # sapper
 
-Combat-ready apps, engineered by Svelte.
+[Military-grade progressive web apps, powered by Svelte.](https://sapper.svelte.technology)
-
-## This is not a thing yet
-
-If you visit this README in a few weeks, hopefully it will have blossomed into the app development framework we deserve. Right now, it's just a set of ideas.
-
----
-
-[Next.js](https://github.com/zeit/next.js/) introduced a beautiful idea — that you should be able to build your app as universal React components in a special `pages` directory, and the framework should take care of routing and rendering on both client and server. What if we did the same thing for Svelte?
-
-High-level goals:
-
-* Extreme ease of development
-* Code-splitting and HMR out of the box (probably via webpack)
-* Best-in-class performance
-* As little magic as possible. Anyone should be able to understand how everything fits together, and e.g. make changes to the webpack config
-* Links are just `<a>` tags, no special `<Link>` components
 
 
-## Design
+## What is Sapper?
 
-A Sapper app is just an Express app (conventionally, `server.js`) that uses the `sapper` middleware:
+Sapper is a framework for building high-performance universal web apps. [Read the guide](https://sapper.svelte.technology/guide) or the [introductory blog post](https://svelte.technology/blog/sapper-towards-the-ideal-web-app-framework) to learn more.
 
-```js
-const app = require('express')();
-const sapper = require('sapper');
 
-app.use(sapper());
+## Get started
 
-const { PORT = 3000 } = process.env;
+Clone the [starter project template](https://github.com/sveltejs/sapper-template) with [degit](https://github.com/rich-harris/degit)...
-app.listen(PORT, () => {
+
-  console.log(`listening on port ${PORT}`);
+```bash
-});
+npx degit sveltejs/sapper-template my-app
 ```
 
-The middleware serves pages that match files in the `routes` directory, and assets generated by webpack. In development mode, the middleware once activated watches `routes` to keep the app up-to-date.
+...then install dependencies and start the dev server...
 
-
+```bash
-## Routing
+cd my-app
-
+npm install
-Like Next, routes are defined by the project directory structure, but with some crucial differences:
+npm run dev
-
-* Files with an `.html` extension are treated as Svelte components. The `routes/about.html` (or `routes/about/index.html`) would create the `/about` route.
-* Files with a `.js` or `.mjs` extension are more generic route handlers. These files should export functions corresponding to the HTTP methods they support (example below).
-* Instead of route masking, we embed parameters in the filename. For example `post/[id].html` maps to `/post/:id`, and the component will be rendered with the appropriate parameter.
-* Nested routes (read [this article](https://joshduff.com/2015-06-why-you-need-a-state-router.md)) can be handled by creating a file that matches the subroute — for example, `routes/app/settings/[submenu].html` would match `/app/settings/profile` *and* `app/settings`, but in the latter case the `submenu` parameter would be `null`.
-
-An example of a generic route:
-
-```js
-// routes/api/post/[id].js
-export async function get(req, res) {
-  try {
-    const data = await getPostFromDatabase(req.params.id);
-    const json = JSON.stringify(data);
-
-    res.set({
-      'Content-Type': 'application/json',
-      'Content-Length': json.length
-    });
-
-    res.send(json);
-  } catch (err) {
-    res.status(500).send(err.message);
-  }
-}
 ```
 
-Or, if you omit the `res` argument, it can use the return value:
+...and navigate to [localhost:3000](http://localhost:3000). To build and run in production mode:
 
-```js
+```bash
-// routes/api/post/[id].js
+npm run build
-export async function get(req) {
+npm start
-  return await getPostFromDatabase(req.params.id);
-}
 ```
 
 
-## Client-side app
+## License
 
-Sapper will create (and in development mode, update) a barebones `main.js` file that dynamically imports individual routes and renders them — something like this:
+[LIL](LICENSE)
-
-```js
-window.addEventListener('click', event => {
-  let a = event.target;
-  while (a && a.nodeName !== 'A') a = a.parentNode;
-  if (!a) return;
-
-  if (navigate(new URL(a.href))) event.preventDefault();
-});
-
-const target = document.querySelector('#sapper');
-let component;
-
-function navigate(url) {
-  if (url.origin !== window.location.origin) return;
-
-  let match;
-  let params = {};
-  const query = {};
-
-  function render(mod) {
-    if (component) {
-      component.destroy();
-    } else {
-      target.innerHTML = '';
-    }
-
-    component = new mod.default({
-      target,
-      data: { query, params },
-      hydrate: !!component
-    });
-  }
-
-  if (url.pathname === '/about') {
-    import('/about/index.html').then(render);
-  } else if (url.pathname === '/') {
-    import('/index.js').then(render);
-  } else if (match = /^\/post\/([^\/]+)$/.exec(url.pathname)) {
-    params.id = match[1];
-    import('/post/[id].html').then(render);
-  } else if (match = /^\/([^\/]+)$/.exec(url.pathname)) {
-    params.wildcard = match[1];
-    import('/[wildcard].html').then(render);
-  }
-
-  return true;
-}
-
-navigate(window.location);
-```
-
-We're glossing over a lot of important stuff here — e.g. handling `popstate` — but you get the idea. Knowledge of all the possible routes means we can generate optimal code, much in the same way that statically analysing Svelte templates allows the compiler to generate optimal code.
-
-
-## Things to figure out
-
-* How to customise the overall page template
-* An equivalent of `getInitialProps`
-* Critical CSS
-* `store` integration
-* Route transitions
-* Equivalent of `next export`
-* A good story for realtime/GraphQL stuff
-* Service worker
-* Using `Link...rel=preload` headers to push main.js/[route].js plus styles
-* ...and lots of other things that haven't occurred to me yet.

lib/index.js

@@ -1,5 +1,6 @@
 const fs = require('fs');
 const path = require('path');
+const serialize = require('serialize-javascript');
 const route_manager = require('./route_manager.js');
 const templates = require('./templates.js');
 const create_app = require('./utils/create_app.js');
@@ -23,9 +24,11 @@ function connect_dev() {
 			heartbeat: 10 * 1000
 		}),
 
-		async (req, res, next) => {
+		(req, res, next) => {
-			asset_cache = await watcher.ready;
+			watcher.ready.then(cache => {
-			next();
+				asset_cache = cache;
+				next();
+			});
 		},
 
 		set_req_pathname,
@@ -125,76 +128,98 @@ function get_asset_handler(opts) {
 	};
 }
 
-function get_route_handler(fn) {
+const resolved = Promise.resolve();
-	return async function handle_route(req, res, next) {
-		const url = req.pathname;
 
-		const { client, server } = fn();
+function get_route_handler(fn) {
+	function handle_route(route, req, res, next, { client, server }) {
+		req.params = route.exec(req.pathname);
+
+		const mod = require(server.entry)[route.id];
+
+		if (route.type === 'page') {
+			// preload main.js and current route
+			// TODO detect other stuff we can preload? images, CSS, fonts?
+			res.set('Link', `<${client.main_file}>;rel="preload";as="script", <${client.routes[route.id]}>;rel="preload";as="script"`);
+
+			const data = { params: req.params, query: req.query };
+
+			if (mod.preload) {
+				const promise = Promise.resolve(mod.preload(req)).then(preloaded => {
+					const serialized = try_serialize(preloaded);
+					Object.assign(data, preloaded);
+
+					return { rendered: mod.render(data), serialized };
+				});
+
+				return templates.stream(res, 200, {
+					scripts: promise.then(({ serialized }) => {
+						const main = `<script src='${client.main_file}'></script>`;
+
+						if (serialized) {
+							return `<script>__SAPPER__ = { preloaded: ${serialized} };</script>${main}`;
+						}
+
+						return main;
+					}),
+					html: promise.then(({ rendered }) => rendered.html),
+					head: promise.then(({ rendered }) => `<noscript id='sapper-head-start'></noscript>${rendered.head}<noscript id='sapper-head-end'></noscript>`),
+					styles: promise.then(({ rendered }) => (rendered.css && rendered.css.code ? `<style>${rendered.css.code}</style>` : ''))
+				});
+			} else {
+				const { html, head, css } = mod.render(data);
+
+				const page = templates.render(200, {
+					scripts: `<script src='${client.main_file}'></script>`,
+					html,
+					head: `<noscript id='sapper-head-start'></noscript>${head}<noscript id='sapper-head-end'></noscript>`,
+					styles: (css && css.code ? `<style>${css.code}</style>` : '')
+				});
+
+				res.end(page);
+			}
+		}
+
+		else {
+			const method = req.method.toLowerCase();
+			// 'delete' cannot be exported from a module because it is a keyword,
+			// so check for 'del' instead
+			const method_export = method === 'delete' ? 'del' : method;
+			const handler = mod[method_export];
+			if (handler) {
+				handler(req, res, next);
+			} else {
+				// no matching handler for method — 404
+				next();
+			}
+		}
+	}
+
+	return function find_route(req, res, next) {
+		const url = req.pathname;
 
 		// whatever happens, we're going to serve some HTML
 		res.set({
 			'Content-Type': 'text/html'
 		});
 
-		try {
+		resolved
-			for (const route of route_manager.routes) {
+			.then(() => {
-				if (route.test(url)) {
+				for (const route of route_manager.routes) {
-					req.params = route.exec(url);
+					if (route.test(url)) return handle_route(route, req, res, next, fn());
-
-					const mod = require(server.entry)[route.id];
-
-					if (route.type === 'page') {
-						// preload main.js and current route
-						// TODO detect other stuff we can preload? images, CSS, fonts?
-						res.set('Link', `<${client.main_file}>;rel="preload";as="script", <${client.routes[route.id]}>;rel="preload";as="script"`);
-
-						const data = { params: req.params, query: req.query };
-
-						if (mod.preload) {
-							const promise = Promise.resolve(mod.preload(req)).then(preloaded => {
-								Object.assign(data, preloaded);
-								return mod.render(data);
-							});
-
-							await templates.stream(res, 200, {
-								main: client.main_file,
-								html: promise.then(rendered => rendered.html),
-								head: promise.then(({ head }) => `<noscript id='sapper-head-start'></noscript>${head}<noscript id='sapper-head-end'></noscript>`),
-								styles: promise.then(({ css }) => (css && css.code ? `<style>${css.code}</style>` : ''))
-							});
-						} else {
-							const { html, head, css } = mod.render(data);
-
-							const page = templates.render(200, {
-								main: client.main_file,
-								html,
-								head: `<noscript id='sapper-head-start'></noscript>${head}<noscript id='sapper-head-end'></noscript>`,
-								styles: (css && css.code ? `<style>${css.code}</style>` : '')
-							});
-
-							res.end(page);
-						}
-					}
-
-					else {
-						const handler = mod[req.method.toLowerCase()];
-						if (handler) handler(req, res, next);
-					}
-
-					return;
 				}
-			}
 
-			next();
+				// no matching route — 404
-		} catch(err) {
+				next();
-			res.status(500);
+			})
-			res.end(templates.render(500, {
+			.catch(err => {
-				title: (err && err.name) || 'Internal server error',
+				res.status(500);
-				url,
+				res.end(templates.render(500, {
-				error: escape_html(err && (err.details || err.message || err) || 'Unknown error'),
+					title: (err && err.name) || 'Internal server error',
-				stack: err && err.stack.split('\n').slice(1).join('\n')
+					url,
-			}));
+					error: escape_html(err && (err.details || err.message || err) || 'Unknown error'),
-		}
+					stack: err && err.stack.split('\n').slice(1).join('\n')
+				}));
+			});
 	};
 }
 
@@ -207,7 +232,7 @@ function get_not_found_handler(fn) {
 			title: 'Not found',
 			status: 404,
 			method: req.method,
-			main: asset_cache.client.main_file,
+			scripts: `<script src='${asset_cache.client.main_file}'></script>`,
 			url: req.url
 		}));
 	};
@@ -236,3 +261,11 @@ function compose_handlers(handlers) {
 function read_json(file) {
 	return JSON.parse(fs.readFileSync(file, 'utf-8'));
 }
+
+function try_serialize(data) {
+	try {
+		return serialize(data);
+	} catch (err) {
+		return null;
+	}
+}

lib/templates.js

@@ -1,10 +1,22 @@
 const fs = require('fs');
 const glob = require('glob');
+const chalk = require('chalk');
 const chokidar = require('chokidar');
+const framer = require('code-frame');
+const { locate } = require('locate-character');
 const { dev } = require('./config.js');
 
 let templates;
 
+function error(e) {
+	if (e.title) console.error(chalk.bold.red(e.title));
+	if (e.body) console.error(chalk.red(e.body));
+	if (e.url) console.error(chalk.cyan(e.url));
+	if (e.frame) console.error(chalk.grey(e.frame));
+
+	process.exit(1);
+}
+
 function create_templates() {
 	templates = glob.sync('*.html', { cwd: 'templates' })
 		.map(file => {
@@ -12,7 +24,24 @@ function create_templates() {
 			const status = file.replace('.html', '').toLowerCase();
 
 			if (!/^[0-9x]{3}$/.test(status)) {
-				throw new Error(`Bad template — should be a valid status code like 404.html, or a wildcard like 2xx.html`);
+				error({
+					title: `templates/${file}`,
+					body: `Bad template — should be a valid status code like 404.html, or a wildcard like 2xx.html`
+				});
+			}
+
+			const index = template.indexOf('%sapper.main%');
+			if (index !== -1) {
+				// TODO remove this in a future version
+				const { line, column } = locate(template, index, { offsetLine: 1 });
+				const frame = framer(template, line, column);
+
+				error({
+					title: `templates/${file}`,
+					body: `<script src='%sapper.main%'> is unsupported — use %sapper.scripts% (without the <script> tag) instead`,
+					url: 'https://github.com/sveltejs/sapper/issues/86',
+					frame
+				});
 			}
 
 			const specificity = (
@@ -31,10 +60,14 @@ function create_templates() {
 						return key in data ? data[key] : '';
 					});
 				},
-				stream: async (res, data) => {
+				stream: (res, data) => {
 					let i = 0;
 
-					do {
+					function stream_inner() {
+						if (i >= template.length) {
+							return;
+						}
+
 						const start = template.indexOf('%sapper', i);
 
 						if (start === -1) {
@@ -53,9 +86,14 @@ function create_templates() {
 						const match = /sapper\.(\w+)/.exec(tag);
 						if (!match || !(match[1] in data)) throw new Error(`Bad template`); // TODO ditto
 
-						res.write(await data[match[1]]);
+						return Promise.resolve(data[match[1]]).then(datamatch => {
-						i = end + 1;
+							res.write(datamatch);
-					} while (i < template.length);
+							i = end + 1;
+							return stream_inner();
+						});
+					}
+
+					return Promise.resolve().then(stream_inner);
 				}
 			};
 		})

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "sapper",
-  "version": "0.2.10",
+  "version": "0.3.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2114,12 +2114,14 @@
       "dependencies": {
         "abbrev": {
           "version": "1.1.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.0.tgz",
+          "integrity": "sha1-0FVMIlZjbi9W58LlrRg/hZQo2B8=",
           "optional": true
         },
         "ajv": {
           "version": "4.11.8",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
+          "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
           "optional": true,
           "requires": {
             "co": "4.6.0",
@@ -2128,16 +2130,19 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
         },
         "aproba": {
           "version": "1.1.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.1.1.tgz",
+          "integrity": "sha1-ldNgDwdxCqDpKYxyatXs8urLq6s=",
           "optional": true
         },
         "are-we-there-yet": {
           "version": "1.1.4",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.4.tgz",
+          "integrity": "sha1-u13KOCu5TwXhUZQ3PRb9O6HKEQ0=",
           "optional": true,
           "requires": {
             "delegates": "1.0.0",
@@ -2146,36 +2151,43 @@
         },
         "asn1": {
           "version": "0.2.3",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
+          "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y=",
           "optional": true
         },
         "assert-plus": {
           "version": "0.2.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz",
+          "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ=",
           "optional": true
         },
         "asynckit": {
           "version": "0.4.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+          "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
           "optional": true
         },
         "aws-sign2": {
           "version": "0.6.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz",
+          "integrity": "sha1-FDQt0428yU0OW4fXY81jYSwOeU8=",
           "optional": true
         },
         "aws4": {
           "version": "1.6.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.6.0.tgz",
+          "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4=",
           "optional": true
         },
         "balanced-match": {
           "version": "0.4.2",
-          "bundled": true
+          "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-0.4.2.tgz",
+          "integrity": "sha1-yz8+PHMtwPAe5wtAPzAuYddwmDg="
         },
         "bcrypt-pbkdf": {
           "version": "1.0.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz",
+          "integrity": "sha1-Y7xdy2EzG5K8Bf1SiVPDNGKgb40=",
           "optional": true,
           "requires": {
             "tweetnacl": "0.14.5"
@@ -2183,21 +2195,24 @@
         },
         "block-stream": {
           "version": "0.0.9",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz",
+          "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
           "requires": {
             "inherits": "2.0.3"
           }
         },
         "boom": {
           "version": "2.10.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
+          "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
           "requires": {
             "hoek": "2.16.3"
           }
         },
         "brace-expansion": {
           "version": "1.1.7",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.7.tgz",
+          "integrity": "sha1-Pv/DxQ4ABTH7cg6v+A8K6O8jz1k=",
           "requires": {
             "balanced-match": "0.4.2",
             "concat-map": "0.0.1"
@@ -2205,51 +2220,61 @@
         },
         "buffer-shims": {
           "version": "1.0.0",
-          "bundled": true
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         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "bundled": true
+          "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+          "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
         },
         "performance-now": {
           "version": "0.2.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-0.2.0.tgz",
+          "integrity": "sha1-M+8wxcd9TqIcWlOGnZG1bY8lVeU=",
           "optional": true
         },
         "process-nextick-args": {
           "version": "1.0.7",
-          "bundled": true
+          "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
+          "integrity": "sha1-FQ4gt1ZZCtP5EJPyWk8q2L/zC6M="
         },
         "punycode": {
           "version": "1.4.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
           "optional": true
         },
         "qs": {
           "version": "6.4.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/qs/-/qs-6.4.0.tgz",
+          "integrity": "sha1-E+JtKK1rD/qpExLNO/cI7TUecjM=",
           "optional": true
         },
         "rc": {
           "version": "1.2.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.1.tgz",
+          "integrity": "sha1-LgPo5C7kULjLPc5lvhv4l04d/ZU=",
           "optional": true,
           "requires": {
             "deep-extend": "0.4.2",
@@ -2674,14 +2761,16 @@
           "dependencies": {
             "minimist": {
               "version": "1.2.0",
-              "bundled": true,
+              "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+              "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
               "optional": true
             }
           }
         },
         "readable-stream": {
           "version": "2.2.9",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.2.9.tgz",
+          "integrity": "sha1-z3jsb0ptHrQ9JkiMrJfwQudLf8g=",
           "requires": {
             "buffer-shims": "1.0.0",
             "core-util-is": "1.0.2",
@@ -2694,7 +2783,8 @@
         },
         "request": {
           "version": "2.81.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/request/-/request-2.81.0.tgz",
+          "integrity": "sha1-xpKJRqDgbF+Nb4qTM0af/aRimKA=",
           "optional": true,
           "requires": {
             "aws-sign2": "0.6.0",
@@ -2723,40 +2813,47 @@
         },
         "rimraf": {
           "version": "2.6.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.1.tgz",
+          "integrity": "sha1-wjOOxkPfeht/5cVPqG9XQopV8z0=",
           "requires": {
             "glob": "7.1.2"
           }
         },
         "safe-buffer": {
           "version": "5.0.1",
-          "bundled": true
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.0.1.tgz",
+          "integrity": "sha1-0mPKVGls2KMGtcplUekt5XkY++c="
         },
         "semver": {
           "version": "5.3.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.3.0.tgz",
+          "integrity": "sha1-myzl094C0XxgEq0yaqa00M9U+U8=",
           "optional": true
         },
         "set-blocking": {
           "version": "2.0.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+          "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
           "optional": true
         },
         "signal-exit": {
           "version": "3.0.2",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
+          "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
           "optional": true
         },
         "sntp": {
           "version": "1.0.9",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/sntp/-/sntp-1.0.9.tgz",
+          "integrity": "sha1-ZUEYTMkK7qbG57NeJlkIJEPGYZg=",
           "requires": {
             "hoek": "2.16.3"
           }
         },
         "sshpk": {
           "version": "1.13.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.13.0.tgz",
+          "integrity": "sha1-/yo+T9BEl1Vf7Zezmg/YL6+zozw=",
           "optional": true,
           "requires": {
             "asn1": "0.2.3",
@@ -2772,14 +2869,16 @@
           "dependencies": {
             "assert-plus": {
               "version": "1.0.0",
-              "bundled": true,
+              "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+              "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
               "optional": true
             }
           }
         },
         "string-width": {
           "version": "1.0.2",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "requires": {
             "code-point-at": "1.1.0",
             "is-fullwidth-code-point": "1.0.0",
@@ -2788,31 +2887,36 @@
         },
         "string_decoder": {
           "version": "1.0.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.1.tgz",
+          "integrity": "sha1-YuIA8DmVWmgQ2N8KM//A8BNmLZg=",
           "requires": {
             "safe-buffer": "5.0.1"
           }
         },
         "stringstream": {
           "version": "0.0.5",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz",
+          "integrity": "sha1-TkhM1N5aC7vuGORjB3EKioFiGHg=",
           "optional": true
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "requires": {
             "ansi-regex": "2.1.1"
           }
         },
         "strip-json-comments": {
           "version": "2.0.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+          "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
           "optional": true
         },
         "tar": {
           "version": "2.2.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.1.tgz",
+          "integrity": "sha1-jk0qJWwOIYXGsYrWlK7JaLg8sdE=",
           "requires": {
             "block-stream": "0.0.9",
             "fstream": "1.0.11",
@@ -2821,7 +2925,8 @@
         },
         "tar-pack": {
           "version": "3.4.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/tar-pack/-/tar-pack-3.4.0.tgz",
+          "integrity": "sha1-I74tf2cagzk3bL2wuP4/3r8xeYQ=",
           "optional": true,
           "requires": {
             "debug": "2.6.8",
@@ -2836,7 +2941,8 @@
         },
         "tough-cookie": {
           "version": "2.3.2",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.2.tgz",
+          "integrity": "sha1-8IH3bkyFcg5sN6X6ztc3FQ2EByo=",
           "optional": true,
           "requires": {
             "punycode": "1.4.1"
@@ -2844,7 +2950,8 @@
         },
         "tunnel-agent": {
           "version": "0.6.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+          "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
           "optional": true,
           "requires": {
             "safe-buffer": "5.0.1"
@@ -2852,26 +2959,31 @@
         },
         "tweetnacl": {
           "version": "0.14.5",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+          "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
           "optional": true
         },
         "uid-number": {
           "version": "0.0.6",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/uid-number/-/uid-number-0.0.6.tgz",
+          "integrity": "sha1-DqEOgDXo61uOREnwbaHHMGY7qoE=",
           "optional": true
         },
         "util-deprecate": {
           "version": "1.0.2",
-          "bundled": true
+          "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+          "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
         },
         "uuid": {
           "version": "3.0.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.0.1.tgz",
+          "integrity": "sha1-ZUS7ot/ajBzxfmKaOjBeK7H+5sE=",
           "optional": true
         },
         "verror": {
           "version": "1.3.6",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/verror/-/verror-1.3.6.tgz",
+          "integrity": "sha1-z/XfEpRtKX0rqu+qJoniW+AcAFw=",
           "optional": true,
           "requires": {
             "extsprintf": "1.0.2"
@@ -2879,7 +2991,8 @@
         },
         "wide-align": {
           "version": "1.1.2",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.2.tgz",
+          "integrity": "sha512-ijDLlyQ7s6x1JgCLur53osjm/UXUYD9+0PbYKrBsYisYXzCxN+HC3mYDNy/dWdmf3AwqwU3CXwDCvsNgGK1S0w==",
           "optional": true,
           "requires": {
             "string-width": "1.0.2"
@@ -2887,7 +3000,8 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true
+          "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+          "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
         }
       }
     },

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sapper",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "Military-grade apps, engineered by Svelte",
   "main": "lib/index.js",
   "bin": {
@@ -19,11 +19,14 @@
   "dependencies": {
     "chalk": "^2.3.0",
     "chokidar": "^1.7.0",
+    "code-frame": "^5.0.0",
     "escape-html": "^1.0.3",
+    "locate-character": "^2.0.5",
     "mkdirp": "^0.5.1",
     "relative": "^3.0.2",
     "require-relative": "^0.8.7",
     "rimraf": "^2.6.2",
+    "serialize-javascript": "^1.4.0",
     "webpack": "^3.10.0",
     "webpack-hot-middleware": "^2.21.0"
   },

src/runtime/index.ts

@@ -68,10 +68,16 @@ function render(Component: ComponentConstructor, data: any, scroll: ScrollPositi
 	}
 }
 
-function prepare_route(Component, data) {
+function prepare_route(Component: ComponentConstructor, data: RouteData) {
-	return Promise.resolve(
+	if (!Component.preload) {
-		Component.preload ? Component.preload(data) : {}
+		return { Component, data };
-	).then(preloaded => {
+	}
+
+	if (!component && window.__SAPPER__ && window.__SAPPER__.preloaded) {
+		return { Component, data: Object.assign(data, window.__SAPPER__.preloaded) };
+	}
+
+	return Promise.resolve(Component.preload(data)).then(preloaded => {
 		Object.assign(data, preloaded)
 		return { Component, data };
 	});
@@ -164,20 +170,24 @@ let prefetching: {
 	promise: Promise<{ Component: ComponentConstructor, data: any }>;
 } = null;
 
-function prefetch(event: MouseEvent | TouchEvent) {
+export function prefetch(href: string) {
-	const a: HTMLAnchorElement = <HTMLAnchorElement>findAnchor(<Node>event.target);
+	const selected = select_route(new URL(href));
-	if (!a || a.rel !== 'prefetch') return;
-
-	const selected = select_route(new URL(a.href));
 
 	if (selected) {
 		prefetching = {
-			href: a.href,
+			href,
 			promise: selected.route.load().then(mod => prepare_route(mod.default, selected.data))
 		};
 	}
 }
 
+function handle_touchstart_mouseover(event: MouseEvent | TouchEvent) {
+	const a: HTMLAnchorElement = <HTMLAnchorElement>findAnchor(<Node>event.target);
+	if (!a || a.rel !== 'prefetch') return;
+
+	prefetch(a.href);
+}
+
 let inited: boolean;
 
 export function init(_target: Node, _routes: Route[]) {
@@ -189,8 +199,8 @@ export function init(_target: Node, _routes: Route[]) {
 		window.addEventListener('popstate', handle_popstate);
 
 		// prefetch
-		window.addEventListener('touchstart', prefetch);
+		window.addEventListener('touchstart', handle_touchstart_mouseover);
-		window.addEventListener('mouseover', prefetch);
+		window.addEventListener('mouseover', handle_touchstart_mouseover);
 
 		inited = true;
 	}

test/app/package-lock.json

@@ -2722,9 +2722,9 @@
       "integrity": "sha1-5WqpTEyAVaFkBKBnS3jyFffI4ZQ="
     },
     "marked": {
-      "version": "0.3.7",
+      "version": "0.3.9",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-0.3.7.tgz",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-0.3.9.tgz",
-      "integrity": "sha512-zBEP4qO1YQp5aXHt8S5wTiOv9i2X74V/LQL0zhUNvVaklt6Ywa6lChxIvS+ibYlCGgADwKwZFhjC3+XfpsvQvQ=="
+      "integrity": "sha512-nW5u0dxpXxHfkHzzrveY45gCbi+R4PaO4WRZYqZNl+vB0hVGeqlFn0aOg1c8AKL63TrNFn9Bm2UP4AdiZ9TPLw=="
     },
     "math-expression-evaluator": {
       "version": "1.2.17",

test/app/package.json

@@ -15,7 +15,7 @@
     "express": "^4.16.2",
     "extract-text-webpack-plugin": "^3.0.2",
     "glob": "^7.1.2",
-    "marked": "^0.3.7",
+    "marked": "^0.3.9",
     "node-fetch": "^1.7.3",
     "npm-run-all": "^4.1.2",
     "serve-static": "^1.13.1",

test/app/routes/about.html

@@ -7,12 +7,13 @@
 
 	<p>This is the 'about' page. There's not much here.</p>
 
-	<button on:click='goto("/blog/what-is-sapper")'>What is Sapper?</button>
+	<button class='goto' on:click='goto("/blog/what-is-sapper")'>What is Sapper?</button>
+	<button class='prefetch' on:click='goto("/blog/why-the-name")'>Why the name?</button>
 </Layout>
 
 <script>
 	import Layout from './_components/Layout.html';
-	import { goto } from '../../../runtime.js';
+	import { goto, prefetch } from '../../../runtime.js';
 
 	export default {
 		components: {
@@ -20,7 +21,8 @@
 		},
 
 		methods: {
-			goto
+			goto,
+			prefetch
 		}
 	};
 </script>

test/app/routes/api/delete/[id].js

@@ -0,0 +1,9 @@
+export function del(req, res) {
+	res.set({
+		'Content-Type': 'application/json'
+	});
+
+	res.end(JSON.stringify({
+		id: req.params.id
+	}));
+}

test/app/routes/delete-test.html

@@ -0,0 +1,15 @@
+<button class='del' on:click='del()'>delete</button>
+
+<script>
+	export default {
+		methods: {
+			del() {
+				fetch(`/api/delete/42`, { method: 'DELETE' })
+					.then(r => r.json())
+					.then(data => {
+						window.deleted = data;
+					});
+			}
+		}
+	};
+</script>

test/app/routes/show-url.html

@@ -3,7 +3,7 @@
 <script>
 	export default {
 		preload({ url }) {
-			return { url };
+			if (url) return { url };
 		}
 	};
 </script>

test/app/templates/2xx.html

@@ -32,6 +32,6 @@
 	<!-- Sapper creates a <script> tag containing `templates/main.js`
 	     and anything else it needs to hydrate the app and
 	     initialise the router -->
-	<script src='%sapper.main%'></script>
+	%sapper.scripts%
 </body>
 </html>

test/common/test.js

@@ -9,6 +9,12 @@ const fetch = require('node-fetch');
 run('production');
 run('development');
 
+Nightmare.action('page', {
+	title(done) {
+		this.evaluate_now(() => document.querySelector('h1').textContent, done);
+	}
+});
+
 function run(env) {
 	describe(`env=${env}`, function () {
 		this.timeout(20000);
@@ -62,52 +68,60 @@ function run(env) {
 			});
 		}
 
-		before(async () => {
+		before(() => {
 			process.chdir(path.resolve(__dirname, '../app'));
 
 			process.env.NODE_ENV = env;
 
+			let exec_promise = Promise.resolve();
+			let sapper;
+
 			if (env === 'production') {
 				const cli = path.resolve(__dirname, '../../cli/index.js');
-				await exec(`${cli} build`);
+				exec_promise = exec(`${cli} build`);
 			}
 
-			const resolved = require.resolve('../..');
+			return exec_promise.then(() => {
-			delete require.cache[resolved];
+				const resolved = require.resolve('../..');
-			const sapper = require(resolved);
+				delete require.cache[resolved];
+				sapper = require(resolved);
 
-			PORT = await getPort();
+				return getPort();
-			base = `http://localhost:${PORT}`;
+			}).then(port => {
+				PORT = port;
+				base = `http://localhost:${PORT}`;
 
-			global.fetch = (url, opts) => {
+				global.fetch = (url, opts) => {
-				if (url[0] === '/') url = `${base}${url}`;
+					if (url[0] === '/') url = `${base}${url}`;
-				return fetch(url, opts);
+					return fetch(url, opts);
-			};
+				};
 
-			let captured;
+				let captured;
-			capture = async fn => {
+				capture = fn => {
-				const result = captured = [];
+					const result = captured = [];
-				await fn();
+					return fn().then(() => {
-				captured = null;
+						captured = null;
-				return result;
+						return result;
-			};
+					});
+				};
 
-			const app = express();
+				const app = express();
 
-			app.use(serve('assets'));
+				app.use(serve('assets'));
 
-			app.use((req, res, next) => {
+				app.use((req, res, next) => {
-				if (captured) captured.push(req);
+					if (captured) captured.push(req);
-				next();
+					next();
-			});
+				});
 
-			middleware = sapper();
+				middleware = sapper();
-			app.use(middleware);
+				app.use(middleware);
 
-			return new Promise((fulfil, reject) => {
+				return new Promise((fulfil, reject) => {
-				server = app.listen(PORT, err => {
+					server = app.listen(PORT, err => {
-					if (err) reject(err);
+						if (err) reject(err);
-					else fulfil();
+						else fulfil();
+					});
 				});
 			});
 		});
@@ -137,159 +151,165 @@ function run(env) {
 				});
 			});
 
-			afterEach(async () => {
+			afterEach(() => {
-				await nightmare.end();
+				return nightmare.end();
 			});
 
-			it('serves /', async () => {
+			it('serves /', () => {
-				const title = await nightmare
+				return nightmare.goto(base).page.title().then(title => {
-					.goto(base)
+					assert.equal(title, 'Great success!');
-					.evaluate(() => document.querySelector('h1').textContent);
-
-				assert.equal(title, 'Great success!');
-			});
-
-			it('serves static route', async () => {
-				const title = await nightmare
-					.goto(`${base}/about`)
-					.evaluate(() => document.querySelector('h1').textContent);
-
-				assert.equal(title, 'About this site');
-			});
-
-			it('serves dynamic route', async () => {
-				const title = await nightmare
-					.goto(`${base}/blog/what-is-sapper`)
-					.evaluate(() => document.querySelector('h1').textContent);
-
-				assert.equal(title, 'What is Sapper?');
-			});
-
-			it('navigates to a new page without reloading', async () => {
-				await nightmare.goto(base).wait(() => window.READY).wait(100);
-
-				const requests = await capture(async () => {
-					await nightmare.click('a[href="/about"]');
 				});
-
-				assert.equal(
-					await nightmare.path(),
-					'/about'
-				);
-
-				assert.equal(
-					await nightmare.evaluate(() => document.title),
-					'About'
-				);
-
-				assert.deepEqual(requests.map(r => r.url), []);
 			});
 
-			it('navigates programmatically', async () => {
+			it('serves static route', () => {
-				await nightmare
+				return nightmare.goto(`${base}/about`).page.title().then(title => {
+					assert.equal(title, 'About this site');
+				});
+			});
+
+			it('serves dynamic route', () => {
+				return nightmare.goto(`${base}/blog/what-is-sapper`).page.title().then(title => {
+					assert.equal(title, 'What is Sapper?');
+				});
+			});
+
+			it('navigates to a new page without reloading', () => {
+				return nightmare.goto(base).wait(() => window.READY).wait(200)
+					.then(() => {
+						return capture(() => nightmare.click('a[href="/about"]'));
+					})
+					.then(requests => {
+						assert.deepEqual(requests.map(r => r.url), []);
+						return nightmare.path();
+					})
+					.then(path => {
+						assert.equal(path, '/about');
+						return nightmare.title();
+					})
+					.then(title => {
+						assert.equal(title, 'About');
+					});
+			});
+
+			it('navigates programmatically', () => {
+				return nightmare
 					.goto(`${base}/about`)
 					.wait(() => window.READY)
-					.click('button')
+					.click('.goto')
 					.wait(() => window.location.pathname === '/blog/what-is-sapper')
-					.wait(100);
+					.wait(100)
-
+					.title()
-				assert.equal(
+					.then(title => {
-					await nightmare.evaluate(() => document.title),
+						assert.equal(title, 'What is Sapper?');
-					'What is Sapper?'
+					});
-				);
 			});
 
-			it('scrolls to active deeplink', async () => {
+			it('prefetches programmatically', () => {
-				const scrollY = await nightmare
+				return nightmare
+					.goto(`${base}/about`)
+					.wait(() => window.READY)
+					.then(() => {
+						return capture(() => {
+							return nightmare
+								.click('.prefetch')
+								.wait(100);
+						});
+					})
+					.then(requests => {
+						assert.ok(!!requests.find(r => r.url === '/api/blog/why-the-name'));
+					});
+			});
+
+			it('scrolls to active deeplink', () => {
+				return nightmare
 					.goto(`${base}/blog/a-very-long-post#four`)
 					.wait(() => window.READY)
 					.wait(100)
-					.evaluate(() => window.scrollY);
+					.evaluate(() => window.scrollY)
-
+					.then(scrollY => {
-				assert.ok(scrollY > 0, scrollY);
+						assert.ok(scrollY > 0, scrollY);
+					});
 			});
 
-			it('reuses prefetch promise', async () => {
+			it('reuses prefetch promise', () => {
-				await nightmare
+				return nightmare
 					.goto(`${base}/blog`)
 					.wait(() => window.READY)
-					.wait(200);
+					.wait(200)
+					.then(() => {
+						return capture(() => {
+							return nightmare
+								.mouseover('[href="/blog/what-is-sapper"]')
+								.wait(200);
+						});
+					})
+					.then(mouseover_requests => {
+						assert.deepEqual(mouseover_requests.map(r => r.url), [
+							'/api/blog/what-is-sapper'
+						]);
 
-				const mouseover_requests = (await capture(async () => {
+						return capture(() => {
-					await nightmare
+							return nightmare
-						.mouseover('[href="/blog/what-is-sapper"]')
+								.click('[href="/blog/what-is-sapper"]')
-						.wait(200);
+								.wait(200);
-				})).map(r => r.url);
+						});
-
+					})
-				assert.deepEqual(mouseover_requests, [
+					.then(click_requests => {
-					'/api/blog/what-is-sapper'
+						assert.deepEqual(click_requests.map(r => r.url), []);
-				]);
+					});
-
-				const click_requests = (await capture(async () => {
-					await nightmare
-						.click('[href="/blog/what-is-sapper"]')
-						.wait(200);
-				})).map(r => r.url);
-
-				assert.deepEqual(click_requests, []);
 			});
 
-			it('cancels navigation if subsequent navigation occurs during preload', async () => {
+			it('cancels navigation if subsequent navigation occurs during preload', () => {
-				await nightmare
+				return nightmare
 					.goto(base)
 					.wait(() => window.READY)
 					.click('a[href="/slow-preload"]')
 					.wait(100)
 					.click('a[href="/about"]')
-					.wait(100);
+					.wait(100)
-
+					.then(() => nightmare.path())
-				assert.equal(
+					.then(path => {
-					await nightmare.path(),
+						assert.equal(path, '/about');
-					'/about'
+						return nightmare.title();
-				);
+					})
-
+					.then(title => {
-				assert.equal(
+						assert.equal(title, 'About');
-					await nightmare.evaluate(() => document.querySelector('h1').textContent),
+						return nightmare.evaluate(() => window.fulfil({})).wait(100);
-					'About this site'
+					})
-				);
+					.then(() => nightmare.path())
-
+					.then(path => {
-				await nightmare
+						assert.equal(path, '/about');
-					.evaluate(() => window.fulfil({}))
+						return nightmare.title();
-					.wait(100);
+					})
-
+					.then(title => {
-				assert.equal(
+						assert.equal(title, 'About');
-					await nightmare.path(),
+					});
-					'/about'
-				);
-
-				assert.equal(
-					await nightmare.evaluate(() => document.querySelector('h1').textContent),
-					'About this site'
-				);
 			});
 
-			it('passes entire request object to preload', async () => {
+			it('passes entire request object to preload', () => {
-				const html = await nightmare
+				return nightmare
 					.goto(`${base}/show-url`)
-					.evaluate(() => document.querySelector('p').innerHTML);
+					.wait(() => window.READY)
-
+					.evaluate(() => document.querySelector('p').innerHTML)
-				assert.equal(html, `URL is /show-url`);
+					.end().then(html => {
+						assert.equal(html, `URL is /show-url`);
+					});
 			});
 		});
 
 		describe('headers', () => {
-			it('sets Content-Type and Link...preload headers', async () => {
+			it('sets Content-Type and Link...preload headers', () => {
-				const { headers } = await get('/');
+				return get('/').then(({ headers }) => {
+					assert.equal(
+						headers['Content-Type'],
+						'text/html'
+					);
 
-				assert.equal(
+					assert.ok(
-					headers['Content-Type'],
+						/<\/client\/main.\w+\.js>;rel="preload";as="script", <\/client\/_.\d+.\w+.js>;rel="preload";as="script"/.test(headers['Link']),
-					'text/html'
+						headers['Link']
-				);
+					);
-
+				});
-				assert.ok(
-					/<\/client\/main.\w+\.js>;rel="preload";as="script", <\/client\/_.\d+.\w+.js>;rel="preload";as="script"/.test(headers['Link']),
-					headers['Link']
-				);
 			});
 		});
 	});

webpack/config.js

@@ -6,7 +6,12 @@ module.exports = {
 	client: {
 		entry: () => {
 			return {
-				main: entry.client
+				main: [
+					entry.client,
+					// workaround for https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/456
+					'style-loader/lib/addStyles',
+					'css-loader/lib/css-base'
+				]
 			};
 		},