From 7d721abb2ab8d7d4b566d777290abc8731bcd46c Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Sun, 21 Jan 2018 11:15:32 -0500
Subject: [PATCH] wip 2

---
 .gitignore                                    |   3 +
 cli.js                                        | 910 +-----------------
 middleware.js                                 | 452 +--------
 rollup.config.js                              |  40 +-
 src/cli/index.js                              |   3 +-
 src/{shared => core}/build.js                 |   0
 src/{shared => core}/export.js                |   0
 src/{shared => core}/generate_asset_cache.js  |   0
 src/{shared => core}/index.js                 |   5 +-
 src/{shared => core}/route_manager.js         |   0
 src/{shared => core}/templates.js             |   0
 src/{shared => core}/utils/compilers.js       |   0
 src/{shared => core}/utils/create_app.js      |   0
 src/{shared => core}/utils/create_routes.js   |   0
 .../utils => middleware}/create_watcher.js    |   5 +-
 src/middleware/index.js                       |   8 +-
 src/middleware/tmp.json                       | 154 ---
 test/unit/create_routes.test.js               |   2 +-
 18 files changed, 61 insertions(+), 1521 deletions(-)
 rename src/{shared => core}/build.js (100%)
 rename src/{shared => core}/export.js (100%)
 rename src/{shared => core}/generate_asset_cache.js (100%)
 rename src/{shared => core}/index.js (62%)
 rename src/{shared => core}/route_manager.js (100%)
 rename src/{shared => core}/templates.js (100%)
 rename src/{shared => core}/utils/compilers.js (100%)
 rename src/{shared => core}/utils/create_app.js (100%)
 rename src/{shared => core}/utils/create_routes.js (100%)
 rename src/{shared/utils => middleware}/create_watcher.js (91%)
 delete mode 100644 src/middleware/tmp.json

diff --git a/.gitignore b/.gitignore
index a063eeb..13773db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,6 @@ cypress/screenshots
 test/app/.sapper
 runtime.js
 yarn.lock
+cli.js
+middleware.js
+core.js
\ No newline at end of file
diff --git a/cli.js b/cli.js
index d5af45d..b89ccba 100644
--- a/cli.js
+++ b/cli.js
@@ -1,915 +1,13 @@
 #!/usr/bin/env node
 'use strict';
 
-function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }
-
-var fs = require('fs');
-var path = require('path');
-var mkdirp = _interopDefault(require('mkdirp'));
-var rimraf = _interopDefault(require('rimraf'));
-var relative = _interopDefault(require('require-relative'));
-var glob = _interopDefault(require('glob'));
-var chalk = _interopDefault(require('chalk'));
-var framer = _interopDefault(require('code-frame'));
-var locateCharacter = require('locate-character');
-var sander = require('sander');
-var express = _interopDefault(require('express'));
-var cheerio = _interopDefault(require('cheerio'));
-var fetch = _interopDefault(require('node-fetch'));
-var URL = _interopDefault(require('url-parse'));
-var serialize = _interopDefault(require('serialize-javascript'));
-var escape_html = _interopDefault(require('escape-html'));
-
-const webpack = relative('webpack', process.cwd());
-
-const client = webpack(
-	require(path.resolve('webpack.client.config.js'))
-);
-
-const server = webpack(
-	require(path.resolve('webpack.server.config.js'))
-);
-
-var compilers = Object.freeze({
-	client: client,
-	server: server
-});
-
-function create_matchers(files) {
-	const routes = files
-		.map(file => {
-			if (/(^|\/|\\)_/.test(file)) return;
-
-			const parts = file.replace(/\.(html|js|mjs)$/, '').split('/'); // glob output is always posix-style
-			if (parts[parts.length - 1] === 'index') parts.pop();
-
-			const id = (
-				parts.join('_').replace(/[[\]]/g, '$').replace(/^\d/, '_$&').replace(/[^a-zA-Z0-9_$]/g, '_')
-			 ) || '_';
-
-			const dynamic = parts
-				.filter(part => part[0] === '[')
-				.map(part => part.slice(1, -1));
-
-			let pattern_string = '';
-			let i = parts.length;
-			let nested = true;
-			while (i--) {
-				const part = parts[i];
-				const dynamic = part[0] === '[';
-
-				if (dynamic) {
-					pattern_string = nested ? `(?:\\/([^/]+)${pattern_string})?` : `\\/([^/]+)${pattern_string}`;
-				} else {
-					nested = false;
-					pattern_string = `\\/${part}${pattern_string}`;
-				}
-			}
-
-			const pattern = new RegExp(`^${pattern_string}\\/?$`);
-
-			const test = url => pattern.test(url);
-
-			const exec = url => {
-				const match = pattern.exec(url);
-				if (!match) return;
-
-				const params = {};
-				dynamic.forEach((param, i) => {
-					params[param] = match[i + 1];
-				});
-
-				return params;
-			};
-
-			return {
-				id,
-				type: path.extname(file) === '.html' ? 'page' : 'route',
-				file,
-				pattern,
-				test,
-				exec,
-				parts,
-				dynamic
-			};
-		})
-		.filter(Boolean)
-		.sort((a, b) => {
-			let same = true;
-
-			for (let i = 0; true; i += 1) {
-				const a_part = a.parts[i];
-				const b_part = b.parts[i];
-
-				if (!a_part && !b_part) {
-					if (same) throw new Error(`The ${a.file} and ${b.file} routes clash`);
-					return 0;
-				}
-
-				if (!a_part) return -1;
-				if (!b_part) return 1;
-
-				const a_is_dynamic = a_part[0] === '[';
-				const b_is_dynamic = b_part[0] === '[';
-
-				if (a_is_dynamic === b_is_dynamic) {
-					if (!a_is_dynamic && a_part !== b_part) same = false;
-					continue;
-				}
-
-				return a_is_dynamic ? 1 : -1;
-			}
-		});
-
-	return routes;
-}
-
-const dev = process.env.NODE_ENV !== 'production';
-
-const templates = path.resolve(process.env.SAPPER_TEMPLATES || 'templates');
-
-const src = path.resolve(process.env.SAPPER_ROUTES || 'routes');
-
-const dest = path.resolve(process.env.SAPPER_DEST || '.sapper');
-
-if (dev) {
-	mkdirp.sync(dest);
-	rimraf.sync(path.join(dest, '**/*'));
-}
-
-const entry = {
-	client: path.resolve(templates, '.main.rendered.js'),
-	server: path.resolve(dest, 'server-entry.js')
-};
-
-const callbacks = [];
-
-function onchange(fn) {
-	callbacks.push(fn);
-}
-
-let routes;
-
-function update() {
-	routes = create_matchers(
-		glob.sync('**/*.+(html|js|mjs)', { cwd: src })
-	);
-
-	callbacks.forEach(fn => fn());
-}
-
-update();
-
-if (dev) {
-	const watcher = require('chokidar').watch(`${src}/**/*.+(html|js|mjs)`, {
-		ignoreInitial: true,
-		persistent: false
-	});
-
-	watcher.on('add', update);
-	watcher.on('change', update);
-	watcher.on('unlink', update);
-}
-
-
-var route_manager = Object.freeze({
-	onchange: onchange,
-	get routes () { return routes; }
-});
-
-function posixify(file) {
-	return file.replace(/[/\\]/g, '/');
-}
-
-function create_app() {
-	const { routes: routes$$1 } = route_manager;
-
-	function create_client_main() {
-		const template = fs.readFileSync('templates/main.js', 'utf-8');
-
-		const code = `[${
-			routes$$1
-				.filter(route => route.type === 'page')
-				.map(route => {
-					const params = route.dynamic.length === 0 ?
-						'{}' :
-						`{ ${route.dynamic.map((part, i) => `${part}: match[${i + 1}]`).join(', ') } }`;
-
-					const file = posixify(`${src}/${route.file}`);
-					return `{ pattern: ${route.pattern}, params: match => (${params}), load: () => import(/* webpackChunkName: "${route.id}" */ '${file}') }`
-				})
-				.join(', ')
-		}]`;
-
-		let main = template
-			.replace(/__app__/g, posixify(path.resolve(__dirname, '../../runtime/app.js')))
-			.replace(/__routes__/g, code)
-			.replace(/__dev__/g, String(dev));
-
-		if (dev) {
-			const hmr_client = posixify(require.resolve(`webpack-hot-middleware/client`));
-			main += `\n\nimport('${hmr_client}?path=/__webpack_hmr&timeout=20000'); if (module.hot) module.hot.accept();`;
-		}
-
-		fs.writeFileSync(entry.client, main);
-
-		// need to fudge the mtime, because webpack is soft in the head
-		const { atime, mtime } = fs.statSync(entry.client);
-		fs.utimesSync(entry.client, new Date(atime.getTime() - 999999), new Date(mtime.getTime() - 999999));
-	}
-
-	function create_server_routes() {
-		const imports = routes$$1
-			.map(route => {
-				const file = posixify(`${src}/${route.file}`);
-				return route.type === 'page' ?
-					`import ${route.id} from '${file}';` :
-					`import * as ${route.id} from '${file}';`;
-			})
-			.join('\n');
-
-		const exports = `export { ${routes$$1.map(route => route.id)} };`;
-
-		fs.writeFileSync(entry.server, `${imports}\n\n${exports}`);
-
-		const { atime, mtime } = fs.statSync(entry.server);
-		fs.utimesSync(entry.server, new Date(atime.getTime() - 999999), new Date(mtime.getTime() - 999999));
-	}
-
-	create_client_main();
-	create_server_routes();
-}
-
-if (dev) {
-	onchange(create_app);
-
-	const watcher = require('chokidar').watch(`templates/main.js`, {
-		ignoreInitial: true,
-		persistent: false
-	});
-
-	watcher.on('add', create_app);
-	watcher.on('change', create_app);
-	watcher.on('unlink', create_app);
-}
-
-let templates$1;
-
-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$1 = glob.sync('*.html', { cwd: 'templates' })
-		.map(file => {
-			const template = fs.readFileSync(`templates/${file}`, 'utf-8');
-			const status = file.replace('.html', '').toLowerCase();
-
-			if (!/^[0-9x]{3}$/.test(status)) {
-				error({
-					title: `templates/${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 } = locateCharacter.locate(template, index, { offsetLine: 1 });
-				const frame = framer(template, line, column);
-
-				error({
-					title: `templates/${file}`,
-					body: `<script src='%sapper.main%'> is unsupported — use %sapper.scripts% (without the <script> tag) instead`,
-					url: 'https://github.com/sveltejs/sapper/issues/86',
-					frame
-				});
-			}
-
-			const specificity = (
-				(status[0] === 'x' ? 0 : 4) +
-				(status[1] === 'x' ? 0 : 2) +
-				(status[2] === 'x' ? 0 : 1)
-			);
-
-			const pattern = new RegExp(`^${status.split('').map(d => d === 'x' ? '\\d' : d).join('')}$`);
-
-			return {
-				test: status => pattern.test(status),
-				specificity,
-				render: data => {
-					return template.replace(/%sapper\.(\w+)%/g, (match, key) => {
-						return key in data ? data[key] : '';
-					});
-				},
-				stream: (res, data) => {
-					let i = 0;
-
-					function stream_inner() {
-						if (i >= template.length) {
-							return;
-						}
-
-						const start = template.indexOf('%sapper', i);
-
-						if (start === -1) {
-							res.end(template.slice(i));
-							return;
-						}
-
-						res.write(template.slice(i, start));
-
-						const end = template.indexOf('%', start + 1);
-						if (end === -1) {
-							throw new Error(`Bad template`); // TODO validate ahead of time
-						}
-
-						const tag = template.slice(start + 1, end);
-						const match = /sapper\.(\w+)/.exec(tag);
-						if (!match || !(match[1] in data)) throw new Error(`Bad template`); // TODO ditto
-
-						return Promise.resolve(data[match[1]]).then(datamatch => {
-							res.write(datamatch);
-							i = end + 1;
-							return stream_inner();
-						});
-					}
-
-					return Promise.resolve().then(stream_inner);
-				}
-			};
-		})
-		.sort((a, b) => b.specificity - a.specificity);
-}
-
-create_templates();
-
-if (dev) {
-	const watcher = require('chokidar').watch('templates/**.html', {
-		ignoreInitial: true,
-		persistent: false
-	});
-
-	watcher.on('add', create_templates);
-	watcher.on('change', create_templates);
-	watcher.on('unlink', create_templates);
-}
-
-function render(status, data) {
-	const template = templates$1.find(template => template.test(status));
-	if (template) return template.render(data);
-
-	return `Missing template for status code ${status}`;
-}
-
-function stream(res, status, data) {
-	const template = templates$1.find(template => template.test(status));
-	if (template) return template.stream(res, data);
-
-	return `Missing template for status code ${status}`;
-}
-
-function ensure_array(thing) {
-	return Array.isArray(thing) ? thing : [thing]; // omg webpack what the HELL are you doing
-}
-
-function generate_asset_cache(clientInfo, serverInfo) {
-	const main_file = `/client/${ensure_array(clientInfo.assetsByChunkName.main)[0]}`;
-
-	const chunk_files = clientInfo.assets.map(chunk => `/client/${chunk.name}`);
-
-	const service_worker = generate_service_worker(chunk_files);
-	const index = generate_index(main_file);
-
-	if (dev) {
-		fs.writeFileSync(path.join(dest, 'service-worker.js'), service_worker);
-		fs.writeFileSync(path.join(dest, 'index.html'), index);
-	}
-
-	return {
-		client: {
-			main_file,
-			chunk_files,
-
-			main: read(`${dest}${main_file}`),
-			chunks: chunk_files.reduce((lookup, file) => {
-				lookup[file] = read(`${dest}${file}`);
-				return lookup;
-			}, {}),
-
-			routes: routes.reduce((lookup, route) => {
-				lookup[route.id] = `/client/${ensure_array(clientInfo.assetsByChunkName[route.id])[0]}`;
-				return lookup;
-			}, {}),
-
-			index,
-			service_worker
-		},
-
-		server: {
-			entry: path.resolve(dest, 'server', serverInfo.assetsByChunkName.main)
-		},
-
-		service_worker
-	};
-}
-
-function generate_service_worker(chunk_files) {
-	const assets = glob.sync('**', { cwd: 'assets', nodir: true });
-
-	const route_code = `[${
-		routes
-			.filter(route => route.type === 'page')
-			.map(route => `{ pattern: ${route.pattern} }`)
-			.join(', ')
-	}]`;
-
-	return read('templates/service-worker.js')
-		.replace(/__timestamp__/g, Date.now())
-		.replace(/__assets__/g, JSON.stringify(assets))
-		.replace(/__shell__/g, JSON.stringify(chunk_files.concat('/index.html')))
-		.replace(/__routes__/g, route_code);
-}
-
-function generate_index(main_file) {
-	return render(200, {
-		styles: '',
-		head: '',
-		html: '<noscript>Please enable JavaScript!</noscript>',
-		main: main_file
-	});
-}
-
-function read(file) {
-	return fs.readFileSync(file, 'utf-8');
-}
-
-process.env.NODE_ENV = 'production';
-
-var build = () => {
-	mkdirp.sync(dest);
-	rimraf.sync(path.join(dest, '**/*'));
-
-	// create main.js and server-routes.js
-	create_app();
-
-	return new Promise((fulfil, reject) => {
-		function handleErrors(err, stats) {
-			if (err) {
-				reject(err);
-				process.exit(1);
-			}
-
-			if (stats.hasErrors()) {
-				console.error(stats.toString({ colors: true }));
-				reject(new Error(`Encountered errors while building app`));
-			}
-		}
-
-		client.run((err, clientStats) => {
-			handleErrors(err, clientStats);
-			const clientInfo = clientStats.toJson();
-			fs.writeFileSync(path.join(dest, 'stats.client.json'), JSON.stringify(clientInfo, null, '  '));
-
-			server.run((err, serverStats) => {
-				handleErrors(err, serverStats);
-				const serverInfo = serverStats.toJson();
-				fs.writeFileSync(path.join(dest, 'stats.server.json'), JSON.stringify(serverInfo, null, '  '));
-
-				generate_asset_cache(clientInfo, serverInfo);
-				fulfil();
-			});
-		});
-	});
-};
-
-function deferred() {
-	const d = {};
-
-	d.promise = new Promise((fulfil, reject) => {
-		d.fulfil = fulfil;
-		d.reject = reject;
-	});
-
-	return d;
-}
-
-function create_watcher() {
-	const deferreds = {
-		client: deferred(),
-		server: deferred()
-	};
-
-	const invalidate = () => Promise.all([
-		deferreds.client.promise,
-		deferreds.server.promise
-	]).then(([client_stats, server_stats]) => {
-		const client_info = client_stats.toJson();
-		fs.writeFileSync(path.join(dest, 'stats.client.json'), JSON.stringify(client_info, null, '  '));
-
-		const server_info = server_stats.toJson();
-		fs.writeFileSync(path.join(dest, 'stats.server.json'), JSON.stringify(server_info, null, '  '));
-
-		return generate_asset_cache(
-			client_stats.toJson(),
-			server_stats.toJson()
-		);
-	});
-
-	function watch_compiler(type) {
-		const compiler = compilers[type];
-
-		compiler.plugin('invalid', filename => {
-			console.log(chalk.cyan(`${type} bundle invalidated, file changed: ${chalk.bold(filename)}`));
-			deferreds[type] = deferred();
-			watcher.ready = invalidate();
-		});
-
-		compiler.plugin('failed', err => {
-			deferreds[type].reject(err);
-		});
-
-		return compiler.watch({}, (err, stats) => {
-			if (stats.hasErrors()) {
-				deferreds[type].reject(stats.toJson().errors[0]);
-			} else {
-				deferreds[type].fulfil(stats);
-			}
-		});
-	}
-
-	const watcher = {
-		ready: invalidate(),
-		client: watch_compiler('client'),
-		server: watch_compiler('server'),
-
-		close: () => {
-			watcher.client.close();
-			watcher.server.close();
-		}
-	};
-
-	return watcher;
-}
-
-function connect_dev() {
-	create_app();
-
-	const watcher = create_watcher();
-
-	let asset_cache;
-
-	const middleware = compose_handlers([
-		require('webpack-hot-middleware')(client, {
-			reload: true,
-			path: '/__webpack_hmr',
-			heartbeat: 10 * 1000
-		}),
-
-		(req, res, next) => {
-			watcher.ready.then(cache => {
-				asset_cache = cache;
-				next();
-			});
-		},
-
-		set_req_pathname,
-
-		get_asset_handler({
-			filter: pathname => pathname === '/index.html',
-			type: 'text/html',
-			cache: 'max-age=600',
-			fn: () => asset_cache.client.index
-		}),
-
-		get_asset_handler({
-			filter: pathname => pathname === '/service-worker.js',
-			type: 'application/javascript',
-			cache: 'max-age=600',
-			fn: () => asset_cache.client.service_worker
-		}),
-
-		get_asset_handler({
-			filter: pathname => pathname.startsWith('/client/'),
-			type: 'application/javascript',
-			cache: 'max-age=31536000',
-			fn: pathname => asset_cache.client.chunks[pathname]
-		}),
-
-		get_route_handler(() => asset_cache),
-
-		get_not_found_handler(() => asset_cache)
-	]);
-
-	middleware.close = () => {
-		watcher.close();
-		// TODO shut down chokidar
-	};
-
-	return middleware;
-}
-
-function connect_prod() {
-	const asset_cache = generate_asset_cache(
-		read_json$1(path.join(dest, 'stats.client.json')),
-		read_json$1(path.join(dest, 'stats.server.json'))
-	);
-
-	const middleware = compose_handlers([
-		set_req_pathname,
-
-		get_asset_handler({
-			filter: pathname => pathname === '/index.html',
-			type: 'text/html',
-			cache: 'max-age=600',
-			fn: () => asset_cache.client.index
-		}),
-
-		get_asset_handler({
-			filter: pathname => pathname === '/service-worker.js',
-			type: 'application/javascript',
-			cache: 'max-age=600',
-			fn: () => asset_cache.client.service_worker
-		}),
-
-		get_asset_handler({
-			filter: pathname => pathname.startsWith('/client/'),
-			type: 'application/javascript',
-			cache: 'max-age=31536000',
-			fn: pathname => asset_cache.client.chunks[pathname]
-		}),
-
-		get_route_handler(() => asset_cache),
-
-		get_not_found_handler(() => asset_cache)
-	]);
-
-	// here for API consistency between dev, and prod, but
-	// doesn't actually need to do anything
-	middleware.close = () => {};
-
-	return middleware;
-}
-
-var middleware = dev ? connect_dev : connect_prod;
-
-function set_req_pathname(req, res, next) {
-	req.pathname = req.url.replace(/\?.+/, '');
-	next();
-}
-
-function get_asset_handler(opts) {
-	return (req, res, next) => {
-		if (!opts.filter(req.pathname)) return next();
-
-		res.setHeader('Content-Type', opts.type);
-		res.setHeader('Cache-Control', opts.cache);
-
-		res.end(opts.fn(req.pathname));
-	};
-}
-
-const resolved = Promise.resolve();
-
-function get_route_handler(fn) {
-	function handle_route(route, req, res, next, { client: client$$1, server: server$$1 }) {
-		req.params = route.exec(req.pathname);
-
-		const mod = require(server$$1.entry)[route.id];
-
-		if (route.type === 'page') {
-			// preload main.js and current route
-			// TODO detect other stuff we can preload? images, CSS, fonts?
-			res.setHeader('Link', `<${client$$1.main_file}>;rel="preload";as="script", <${client$$1.routes[route.id]}>;rel="preload";as="script"`);
-
-			const data = { params: req.params, query: req.query };
-
-			if (mod.preload) {
-				const promise = Promise.resolve(mod.preload(req)).then(preloaded => {
-					const serialized = try_serialize(preloaded);
-					Object.assign(data, preloaded);
-
-					return { rendered: mod.render(data), serialized };
-				});
-
-				return stream(res, 200, {
-					scripts: promise.then(({ serialized }) => {
-						const main = `<script src='${client$$1.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 = render(200, {
-					scripts: `<script src='${client$$1.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.setHeader('Content-Type', 'text/html');
-
-		resolved
-			.then(() => {
-				for (const route of routes) {
-					if (route.test(url)) return handle_route(route, req, res, next, fn());
-				}
-
-				// no matching route — 404
-				next();
-			})
-			.catch(err => {
-				res.statusCode = 500;
-				res.end(render(500, {
-					title: (err && err.name) || 'Internal server error',
-					url,
-					error: escape_html(err && (err.details || err.message || err) || 'Unknown error'),
-					stack: err && err.stack.split('\n').slice(1).join('\n')
-				}));
-			});
-	};
-}
-
-function get_not_found_handler(fn) {
-	return function handle_not_found(req, res) {
-		const asset_cache = fn();
-
-		res.statusCode = 404;
-		res.end(render(404, {
-			title: 'Not found',
-			status: 404,
-			method: req.method,
-			scripts: `<script src='${asset_cache.client.main_file}'></script>`,
-			url: req.url
-		}));
-	};
-}
-
-function compose_handlers(handlers) {
-	return (req, res, next) => {
-		let i = 0;
-		function go() {
-			const handler = handlers[i];
-
-			if (handler) {
-				handler(req, res, () => {
-					i += 1;
-					go();
-				});
-			} else {
-				next();
-			}
-		}
-
-		go();
-	};
-}
-
-function read_json$1(file) {
-	return JSON.parse(fs.readFileSync(file, 'utf-8'));
-}
-
-function try_serialize(data) {
-	try {
-		return serialize(data);
-	} catch (err) {
-		return null;
-	}
-}
-
-const { PORT = 3000, OUTPUT_DIR = 'dist' } = process.env;
-
-const origin = `http://localhost:${PORT}`;
-
-const app = express();
-
-function read_json(file) {
-	return JSON.parse(sander.readFileSync(file, { encoding: 'utf-8' }));
-}
-
-function exporter() {
-	// Prep output directory
-	sander.rimrafSync(OUTPUT_DIR);
-
-	const { service_worker } = generate_asset_cache(
-		read_json(path.join(dest, 'stats.client.json')),
-		read_json(path.join(dest, 'stats.server.json'))
-	);
-
-	sander.copydirSync('assets').to(OUTPUT_DIR);
-	sander.copydirSync(dest, 'client').to(OUTPUT_DIR, 'client');
-	sander.writeFileSync(OUTPUT_DIR, 'service-worker.js', service_worker);
-
-	// Intercept server route fetches
-	function save(res) {
-		res = res.clone();
-
-		return res.text().then(body => {
-			const { pathname } = new URL(res.url);
-			let dest$$1 = OUTPUT_DIR + pathname;
-
-			const type = res.headers.get('Content-Type');
-			if (type.startsWith('text/html')) dest$$1 += '/index.html';
-
-			sander.writeFileSync(dest$$1, body);
-
-			return body;
-		});
-	}
-
-	global.fetch = (url, opts) => {
-		if (url[0] === '/') {
-			url = `http://localhost:${PORT}${url}`;
-
-			return fetch(url, opts)
-				.then(r => {
-					save(r);
-					return r;
-				});
-		}
-
-		return fetch(url, opts);
-	};
-
-	app.use(middleware());
-	const server = app.listen(PORT);
-
-	const seen = new Set();
-
-	function handle(url) {
-		if (url.origin !== origin) return;
-
-		if (seen.has(url.pathname)) return;
-		seen.add(url.pathname);
-
-		return fetch(url.href)
-			.then(r => {
-				save(r);
-				return r.text();
-			})
-			.then(body => {
-				const $ = cheerio.load(body);
-				const hrefs = [];
-
-				$('a[href]').each((i, $a) => {
-					hrefs.push($a.attribs.href);
-				});
-
-				return hrefs.reduce((promise, href) => {
-					return promise.then(() => handle(new URL(href, url.href)));
-				}, Promise.resolve());
-			})
-			.catch(err => {
-				console.error(`Error rendering ${url.pathname}: ${err.message}`);
-			});
-	}
-
-	return handle(new URL(origin)) // TODO all static routes
-		.then(() => server.close());
-}
+var core_js = require('./core.js');
 
 const cmd = process.argv[2];
 const start = Date.now();
 
 if (cmd === 'build') {
-	build()
+	core_js.build()
 		.then(() => {
 			const elapsed = Date.now() - start;
 			console.error(`built in ${elapsed}ms`); // TODO beautify this, e.g. 'built in 4.7 seconds'
@@ -920,8 +18,8 @@ if (cmd === 'build') {
 } else if (cmd === 'export') {
 	const start = Date.now();
 
-	build()
-		.then(() => exporter())
+	core_js.build()
+		.then(() => core_js.export())
 		.then(() => {
 			const elapsed = Date.now() - start;
 			console.error(`extracted in ${elapsed}ms`); // TODO beautify this, e.g. 'built in 4.7 seconds'
diff --git a/middleware.js b/middleware.js
index c23539e..4ef5712 100644
--- a/middleware.js
+++ b/middleware.js
@@ -6,106 +6,14 @@ var fs = require('fs');
 var path = require('path');
 var serialize = _interopDefault(require('serialize-javascript'));
 var escape_html = _interopDefault(require('escape-html'));
-var glob = _interopDefault(require('glob'));
+var core_js = require('./core.js');
+var chalk = _interopDefault(require('chalk'));
 var mkdirp = _interopDefault(require('mkdirp'));
 var rimraf = _interopDefault(require('rimraf'));
-var chalk = _interopDefault(require('chalk'));
-var framer = _interopDefault(require('code-frame'));
-var locateCharacter = require('locate-character');
-var relative = _interopDefault(require('require-relative'));
-
-function create_matchers(files) {
-	const routes = files
-		.map(file => {
-			if (/(^|\/|\\)_/.test(file)) return;
-
-			const parts = file.replace(/\.(html|js|mjs)$/, '').split('/'); // glob output is always posix-style
-			if (parts[parts.length - 1] === 'index') parts.pop();
-
-			const id = (
-				parts.join('_').replace(/[[\]]/g, '$').replace(/^\d/, '_$&').replace(/[^a-zA-Z0-9_$]/g, '_')
-			 ) || '_';
-
-			const dynamic = parts
-				.filter(part => part[0] === '[')
-				.map(part => part.slice(1, -1));
-
-			let pattern_string = '';
-			let i = parts.length;
-			let nested = true;
-			while (i--) {
-				const part = parts[i];
-				const dynamic = part[0] === '[';
-
-				if (dynamic) {
-					pattern_string = nested ? `(?:\\/([^/]+)${pattern_string})?` : `\\/([^/]+)${pattern_string}`;
-				} else {
-					nested = false;
-					pattern_string = `\\/${part}${pattern_string}`;
-				}
-			}
-
-			const pattern = new RegExp(`^${pattern_string}\\/?$`);
-
-			const test = url => pattern.test(url);
-
-			const exec = url => {
-				const match = pattern.exec(url);
-				if (!match) return;
-
-				const params = {};
-				dynamic.forEach((param, i) => {
-					params[param] = match[i + 1];
-				});
-
-				return params;
-			};
-
-			return {
-				id,
-				type: path.extname(file) === '.html' ? 'page' : 'route',
-				file,
-				pattern,
-				test,
-				exec,
-				parts,
-				dynamic
-			};
-		})
-		.filter(Boolean)
-		.sort((a, b) => {
-			let same = true;
-
-			for (let i = 0; true; i += 1) {
-				const a_part = a.parts[i];
-				const b_part = b.parts[i];
-
-				if (!a_part && !b_part) {
-					if (same) throw new Error(`The ${a.file} and ${b.file} routes clash`);
-					return 0;
-				}
-
-				if (!a_part) return -1;
-				if (!b_part) return 1;
-
-				const a_is_dynamic = a_part[0] === '[';
-				const b_is_dynamic = b_part[0] === '[';
-
-				if (a_is_dynamic === b_is_dynamic) {
-					if (!a_is_dynamic && a_part !== b_part) same = false;
-					continue;
-				}
-
-				return a_is_dynamic ? 1 : -1;
-			}
-		});
-
-	return routes;
-}
 
 const dev = process.env.NODE_ENV !== 'production';
 
-const templates = path.resolve(process.env.SAPPER_TEMPLATES || 'templates');
+const templates$1 = path.resolve(process.env.SAPPER_TEMPLATES || 'templates');
 
 const src = path.resolve(process.env.SAPPER_ROUTES || 'routes');
 
@@ -117,332 +25,10 @@ if (dev) {
 }
 
 const entry = {
-	client: path.resolve(templates, '.main.rendered.js'),
+	client: path.resolve(templates$1, '.main.rendered.js'),
 	server: path.resolve(dest, 'server-entry.js')
 };
 
-const callbacks = [];
-
-function onchange(fn) {
-	callbacks.push(fn);
-}
-
-let routes;
-
-function update() {
-	routes = create_matchers(
-		glob.sync('**/*.+(html|js|mjs)', { cwd: src })
-	);
-
-	callbacks.forEach(fn => fn());
-}
-
-update();
-
-if (dev) {
-	const watcher = require('chokidar').watch(`${src}/**/*.+(html|js|mjs)`, {
-		ignoreInitial: true,
-		persistent: false
-	});
-
-	watcher.on('add', update);
-	watcher.on('change', update);
-	watcher.on('unlink', update);
-}
-
-
-var route_manager = Object.freeze({
-	onchange: onchange,
-	get routes () { return routes; }
-});
-
-let templates$1;
-
-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$1 = glob.sync('*.html', { cwd: 'templates' })
-		.map(file => {
-			const template = fs.readFileSync(`templates/${file}`, 'utf-8');
-			const status = file.replace('.html', '').toLowerCase();
-
-			if (!/^[0-9x]{3}$/.test(status)) {
-				error({
-					title: `templates/${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 } = locateCharacter.locate(template, index, { offsetLine: 1 });
-				const frame = framer(template, line, column);
-
-				error({
-					title: `templates/${file}`,
-					body: `<script src='%sapper.main%'> is unsupported — use %sapper.scripts% (without the <script> tag) instead`,
-					url: 'https://github.com/sveltejs/sapper/issues/86',
-					frame
-				});
-			}
-
-			const specificity = (
-				(status[0] === 'x' ? 0 : 4) +
-				(status[1] === 'x' ? 0 : 2) +
-				(status[2] === 'x' ? 0 : 1)
-			);
-
-			const pattern = new RegExp(`^${status.split('').map(d => d === 'x' ? '\\d' : d).join('')}$`);
-
-			return {
-				test: status => pattern.test(status),
-				specificity,
-				render: data => {
-					return template.replace(/%sapper\.(\w+)%/g, (match, key) => {
-						return key in data ? data[key] : '';
-					});
-				},
-				stream: (res, data) => {
-					let i = 0;
-
-					function stream_inner() {
-						if (i >= template.length) {
-							return;
-						}
-
-						const start = template.indexOf('%sapper', i);
-
-						if (start === -1) {
-							res.end(template.slice(i));
-							return;
-						}
-
-						res.write(template.slice(i, start));
-
-						const end = template.indexOf('%', start + 1);
-						if (end === -1) {
-							throw new Error(`Bad template`); // TODO validate ahead of time
-						}
-
-						const tag = template.slice(start + 1, end);
-						const match = /sapper\.(\w+)/.exec(tag);
-						if (!match || !(match[1] in data)) throw new Error(`Bad template`); // TODO ditto
-
-						return Promise.resolve(data[match[1]]).then(datamatch => {
-							res.write(datamatch);
-							i = end + 1;
-							return stream_inner();
-						});
-					}
-
-					return Promise.resolve().then(stream_inner);
-				}
-			};
-		})
-		.sort((a, b) => b.specificity - a.specificity);
-}
-
-create_templates();
-
-if (dev) {
-	const watcher = require('chokidar').watch('templates/**.html', {
-		ignoreInitial: true,
-		persistent: false
-	});
-
-	watcher.on('add', create_templates);
-	watcher.on('change', create_templates);
-	watcher.on('unlink', create_templates);
-}
-
-function render(status, data) {
-	const template = templates$1.find(template => template.test(status));
-	if (template) return template.render(data);
-
-	return `Missing template for status code ${status}`;
-}
-
-function stream(res, status, data) {
-	const template = templates$1.find(template => template.test(status));
-	if (template) return template.stream(res, data);
-
-	return `Missing template for status code ${status}`;
-}
-
-function posixify(file) {
-	return file.replace(/[/\\]/g, '/');
-}
-
-function create_app() {
-	const { routes: routes$$1 } = route_manager;
-
-	function create_client_main() {
-		const template = fs.readFileSync('templates/main.js', 'utf-8');
-
-		const code = `[${
-			routes$$1
-				.filter(route => route.type === 'page')
-				.map(route => {
-					const params = route.dynamic.length === 0 ?
-						'{}' :
-						`{ ${route.dynamic.map((part, i) => `${part}: match[${i + 1}]`).join(', ') } }`;
-
-					const file = posixify(`${src}/${route.file}`);
-					return `{ pattern: ${route.pattern}, params: match => (${params}), load: () => import(/* webpackChunkName: "${route.id}" */ '${file}') }`
-				})
-				.join(', ')
-		}]`;
-
-		let main = template
-			.replace(/__app__/g, posixify(path.resolve(__dirname, '../../runtime/app.js')))
-			.replace(/__routes__/g, code)
-			.replace(/__dev__/g, String(dev));
-
-		if (dev) {
-			const hmr_client = posixify(require.resolve(`webpack-hot-middleware/client`));
-			main += `\n\nimport('${hmr_client}?path=/__webpack_hmr&timeout=20000'); if (module.hot) module.hot.accept();`;
-		}
-
-		fs.writeFileSync(entry.client, main);
-
-		// need to fudge the mtime, because webpack is soft in the head
-		const { atime, mtime } = fs.statSync(entry.client);
-		fs.utimesSync(entry.client, new Date(atime.getTime() - 999999), new Date(mtime.getTime() - 999999));
-	}
-
-	function create_server_routes() {
-		const imports = routes$$1
-			.map(route => {
-				const file = posixify(`${src}/${route.file}`);
-				return route.type === 'page' ?
-					`import ${route.id} from '${file}';` :
-					`import * as ${route.id} from '${file}';`;
-			})
-			.join('\n');
-
-		const exports = `export { ${routes$$1.map(route => route.id)} };`;
-
-		fs.writeFileSync(entry.server, `${imports}\n\n${exports}`);
-
-		const { atime, mtime } = fs.statSync(entry.server);
-		fs.utimesSync(entry.server, new Date(atime.getTime() - 999999), new Date(mtime.getTime() - 999999));
-	}
-
-	create_client_main();
-	create_server_routes();
-}
-
-if (dev) {
-	onchange(create_app);
-
-	const watcher = require('chokidar').watch(`templates/main.js`, {
-		ignoreInitial: true,
-		persistent: false
-	});
-
-	watcher.on('add', create_app);
-	watcher.on('change', create_app);
-	watcher.on('unlink', create_app);
-}
-
-const webpack = relative('webpack', process.cwd());
-
-const client = webpack(
-	require(path.resolve('webpack.client.config.js'))
-);
-
-const server = webpack(
-	require(path.resolve('webpack.server.config.js'))
-);
-
-var compilers = Object.freeze({
-	client: client,
-	server: server
-});
-
-function ensure_array(thing) {
-	return Array.isArray(thing) ? thing : [thing]; // omg webpack what the HELL are you doing
-}
-
-function generate_asset_cache(clientInfo, serverInfo) {
-	const main_file = `/client/${ensure_array(clientInfo.assetsByChunkName.main)[0]}`;
-
-	const chunk_files = clientInfo.assets.map(chunk => `/client/${chunk.name}`);
-
-	const service_worker = generate_service_worker(chunk_files);
-	const index = generate_index(main_file);
-
-	if (dev) {
-		fs.writeFileSync(path.join(dest, 'service-worker.js'), service_worker);
-		fs.writeFileSync(path.join(dest, 'index.html'), index);
-	}
-
-	return {
-		client: {
-			main_file,
-			chunk_files,
-
-			main: read(`${dest}${main_file}`),
-			chunks: chunk_files.reduce((lookup, file) => {
-				lookup[file] = read(`${dest}${file}`);
-				return lookup;
-			}, {}),
-
-			routes: routes.reduce((lookup, route) => {
-				lookup[route.id] = `/client/${ensure_array(clientInfo.assetsByChunkName[route.id])[0]}`;
-				return lookup;
-			}, {}),
-
-			index,
-			service_worker
-		},
-
-		server: {
-			entry: path.resolve(dest, 'server', serverInfo.assetsByChunkName.main)
-		},
-
-		service_worker
-	};
-}
-
-function generate_service_worker(chunk_files) {
-	const assets = glob.sync('**', { cwd: 'assets', nodir: true });
-
-	const route_code = `[${
-		routes
-			.filter(route => route.type === 'page')
-			.map(route => `{ pattern: ${route.pattern} }`)
-			.join(', ')
-	}]`;
-
-	return read('templates/service-worker.js')
-		.replace(/__timestamp__/g, Date.now())
-		.replace(/__assets__/g, JSON.stringify(assets))
-		.replace(/__shell__/g, JSON.stringify(chunk_files.concat('/index.html')))
-		.replace(/__routes__/g, route_code);
-}
-
-function generate_index(main_file) {
-	return render(200, {
-		styles: '',
-		head: '',
-		html: '<noscript>Please enable JavaScript!</noscript>',
-		main: main_file
-	});
-}
-
-function read(file) {
-	return fs.readFileSync(file, 'utf-8');
-}
-
 function deferred() {
 	const d = {};
 
@@ -470,14 +56,14 @@ function create_watcher() {
 		const server_info = server_stats.toJson();
 		fs.writeFileSync(path.join(dest, 'stats.server.json'), JSON.stringify(server_info, null, '  '));
 
-		return generate_asset_cache(
+		return core_js.generate_asset_cache(
 			client_stats.toJson(),
 			server_stats.toJson()
 		);
 	});
 
 	function watch_compiler(type) {
-		const compiler = compilers[type];
+		const compiler = core_js.compilers[type];
 
 		compiler.plugin('invalid', filename => {
 			console.log(chalk.cyan(`${type} bundle invalidated, file changed: ${chalk.bold(filename)}`));
@@ -513,14 +99,14 @@ function create_watcher() {
 }
 
 function connect_dev() {
-	create_app();
+	core_js.create_app();
 
 	const watcher = create_watcher();
 
 	let asset_cache;
 
 	const middleware = compose_handlers([
-		require('webpack-hot-middleware')(client, {
+		require('webpack-hot-middleware')(core_js.compilers.client, {
 			reload: true,
 			path: '/__webpack_hmr',
 			heartbeat: 10 * 1000
@@ -570,7 +156,7 @@ function connect_dev() {
 }
 
 function connect_prod() {
-	const asset_cache = generate_asset_cache(
+	const asset_cache = core_js.generate_asset_cache(
 		read_json(path.join(dest, 'stats.client.json')),
 		read_json(path.join(dest, 'stats.server.json'))
 	);
@@ -632,15 +218,15 @@ function get_asset_handler(opts) {
 const resolved = Promise.resolve();
 
 function get_route_handler(fn) {
-	function handle_route(route, req, res, next, { client: client$$1, server: server$$1 }) {
+	function handle_route(route, req, res, next, { client, server }) {
 		req.params = route.exec(req.pathname);
 
-		const mod = require(server$$1.entry)[route.id];
+		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.setHeader('Link', `<${client$$1.main_file}>;rel="preload";as="script", <${client$$1.routes[route.id]}>;rel="preload";as="script"`);
+			res.setHeader('Link', `<${client.main_file}>;rel="preload";as="script", <${client.routes[route.id]}>;rel="preload";as="script"`);
 
 			const data = { params: req.params, query: req.query };
 
@@ -652,9 +238,9 @@ function get_route_handler(fn) {
 					return { rendered: mod.render(data), serialized };
 				});
 
-				return stream(res, 200, {
+				return core_js.templates.stream(res, 200, {
 					scripts: promise.then(({ serialized }) => {
-						const main = `<script src='${client$$1.main_file}'></script>`;
+						const main = `<script src='${client.main_file}'></script>`;
 
 						if (serialized) {
 							return `<script>__SAPPER__ = { preloaded: ${serialized} };</script>${main}`;
@@ -669,8 +255,8 @@ function get_route_handler(fn) {
 			} else {
 				const { html, head, css } = mod.render(data);
 
-				const page = render(200, {
-					scripts: `<script src='${client$$1.main_file}'></script>`,
+				const page = core_js.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>` : '')
@@ -703,7 +289,7 @@ function get_route_handler(fn) {
 
 		resolved
 			.then(() => {
-				for (const route of routes) {
+				for (const route of core_js.route_manager.routes) {
 					if (route.test(url)) return handle_route(route, req, res, next, fn());
 				}
 
@@ -712,7 +298,7 @@ function get_route_handler(fn) {
 			})
 			.catch(err => {
 				res.statusCode = 500;
-				res.end(render(500, {
+				res.end(core_js.templates.render(500, {
 					title: (err && err.name) || 'Internal server error',
 					url,
 					error: escape_html(err && (err.details || err.message || err) || 'Unknown error'),
@@ -727,7 +313,7 @@ function get_not_found_handler(fn) {
 		const asset_cache = fn();
 
 		res.statusCode = 404;
-		res.end(render(404, {
+		res.end(core_js.templates.render(404, {
 			title: 'Not found',
 			status: 404,
 			method: req.method,
diff --git a/rollup.config.js b/rollup.config.js
index 8074091..c8fae3b 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -3,9 +3,14 @@ import pkg from './package.json';
 
 const external = [].concat(
 	Object.keys(pkg.dependencies),
-	Object.keys(process.binding('natives'))
+	Object.keys(process.binding('natives')),
+	'sapper'
 );
 
+const paths = {
+	'sapper/core.js': './core.js'
+};
+
 export default [
 	// cli.js
 	{
@@ -16,6 +21,7 @@ export default [
 			banner: '#!/usr/bin/env node'
 		},
 		external,
+		paths,
 		plugins: [
 			typescript({
 				typescript: require('typescript')
@@ -24,20 +30,21 @@ export default [
 	},
 
 	// core.js
-	// {
-	// 	input: 'src/core/index.js',
-	// 	output: {
-	// 		file: 'core.js',
-	// 		format: 'cjs',
-	// 		banner: '#!/usr/bin/env node'
-	// 	},
-	// 	external,
-	// 	plugins: [
-	// 		typescript({
-	// 			typescript: require('typescript')
-	// 		})
-	// 	]
-	// },
+	{
+		input: 'src/core/index.js',
+		output: {
+			file: 'core.js',
+			format: 'cjs',
+			banner: '#!/usr/bin/env node'
+		},
+		external,
+		paths,
+		plugins: [
+			typescript({
+				typescript: require('typescript')
+			})
+		]
+	},
 
 	// middleware.js
 	{
@@ -47,6 +54,7 @@ export default [
 			format: 'cjs'
 		},
 		external,
+		paths,
 		plugins: [
 			typescript({
 				typescript: require('typescript')
@@ -62,6 +70,7 @@ export default [
 			format: 'es'
 		},
 		external,
+		paths,
 		plugins: [
 			typescript({
 				typescript: require('typescript')
@@ -77,6 +86,7 @@ export default [
 			format: 'cjs'
 		},
 		external,
+		paths,
 		plugins: [
 			typescript({
 				typescript: require('typescript')
diff --git a/src/cli/index.js b/src/cli/index.js
index 1999207..64478c4 100755
--- a/src/cli/index.js
+++ b/src/cli/index.js
@@ -1,5 +1,4 @@
-import build from '../shared/build.js';
-import exporter from '../shared/export.js';
+import { build, export as exporter } from 'sapper/core.js';
 
 const cmd = process.argv[2];
 const start = Date.now();
diff --git a/src/shared/build.js b/src/core/build.js
similarity index 100%
rename from src/shared/build.js
rename to src/core/build.js
diff --git a/src/shared/export.js b/src/core/export.js
similarity index 100%
rename from src/shared/export.js
rename to src/core/export.js
diff --git a/src/shared/generate_asset_cache.js b/src/core/generate_asset_cache.js
similarity index 100%
rename from src/shared/generate_asset_cache.js
rename to src/core/generate_asset_cache.js
diff --git a/src/shared/index.js b/src/core/index.js
similarity index 62%
rename from src/shared/index.js
rename to src/core/index.js
index 98c7757..ced82f2 100644
--- a/src/shared/index.js
+++ b/src/core/index.js
@@ -1,7 +1,10 @@
 import * as route_manager from './route_manager.js';
 import * as templates from './templates.js';
+import * as compilers from './utils/compilers.js';
 
 export { default as build } from './build.js';
 export { default as export } from './export.js';
 export { default as generate_asset_cache } from './generate_asset_cache.js';
-export { route_manager, templates };
\ No newline at end of file
+export { default as create_app } from './utils/create_app.js';
+
+export { compilers, route_manager, templates };
\ No newline at end of file
diff --git a/src/shared/route_manager.js b/src/core/route_manager.js
similarity index 100%
rename from src/shared/route_manager.js
rename to src/core/route_manager.js
diff --git a/src/shared/templates.js b/src/core/templates.js
similarity index 100%
rename from src/shared/templates.js
rename to src/core/templates.js
diff --git a/src/shared/utils/compilers.js b/src/core/utils/compilers.js
similarity index 100%
rename from src/shared/utils/compilers.js
rename to src/core/utils/compilers.js
diff --git a/src/shared/utils/create_app.js b/src/core/utils/create_app.js
similarity index 100%
rename from src/shared/utils/create_app.js
rename to src/core/utils/create_app.js
diff --git a/src/shared/utils/create_routes.js b/src/core/utils/create_routes.js
similarity index 100%
rename from src/shared/utils/create_routes.js
rename to src/core/utils/create_routes.js
diff --git a/src/shared/utils/create_watcher.js b/src/middleware/create_watcher.js
similarity index 91%
rename from src/shared/utils/create_watcher.js
rename to src/middleware/create_watcher.js
index c0f3c34..6ae8f08 100644
--- a/src/shared/utils/create_watcher.js
+++ b/src/middleware/create_watcher.js
@@ -1,9 +1,8 @@
 import * as fs from 'fs';
 import * as path from 'path';
 import chalk from 'chalk';
-import * as compilers from './compilers.js';
-import generate_asset_cache from '../../shared/generate_asset_cache.js';
-import { dest } from '../../config.js';
+import { compilers, generate_asset_cache } from 'sapper/core.js';
+import { dest } from '../config.js';
 
 function deferred() {
 	const d = {};
diff --git a/src/middleware/index.js b/src/middleware/index.js
index 87b24b6..89bb113 100644
--- a/src/middleware/index.js
+++ b/src/middleware/index.js
@@ -2,12 +2,8 @@ import * as fs from 'fs';
 import * as path from 'path';
 import serialize from 'serialize-javascript';
 import escape_html from 'escape-html';
-import * as route_manager from '../shared/route_manager.js';
-import * as templates from '../shared/templates.js';
-import create_app from '../shared/utils/create_app.js';
-import create_watcher from '../shared/utils/create_watcher.js';
-import * as compilers from '../shared/utils/compilers.js';
-import generate_asset_cache from '../shared/generate_asset_cache.js';
+import { route_manager, templates, create_app, compilers, generate_asset_cache } from 'sapper/core.js';
+import create_watcher from './create_watcher.js';
 import { dest, dev } from '../config.js';
 
 function connect_dev() {
diff --git a/src/middleware/tmp.json b/src/middleware/tmp.json
deleted file mode 100644
index 1f3ea02..0000000
--- a/src/middleware/tmp.json
+++ /dev/null
@@ -1,154 +0,0 @@
-[
-    {
-      "x": 1979,
-      "y": 7.19
-    },
-    {
-      "x": 1980,
-      "y": 7.83
-    },
-    {
-      "x": 1981,
-      "y": 7.24
-    },
-    {
-      "x": 1982,
-      "y": 7.44
-    },
-    {
-      "x": 1983,
-      "y": 7.51
-    },
-    {
-      "x": 1984,
-      "y": 7.1
-    },
-    {
-      "x": 1985,
-      "y": 6.91
-    },
-    {
-      "x": 1986,
-      "y": 7.53
-    },
-    {
-      "x": 1987,
-      "y": 7.47
-    },
-    {
-      "x": 1988,
-      "y": 7.48
-    },
-    {
-      "x": 1989,
-      "y": 7.03
-    },
-    {
-      "x": 1990,
-      "y": 6.23
-    },
-    {
-      "x": 1991,
-      "y": 6.54
-    },
-    {
-      "x": 1992,
-      "y": 7.54
-    },
-    {
-      "x": 1993,
-      "y": 6.5
-    },
-    {
-      "x": 1994,
-      "y": 7.18
-    },
-    {
-      "x": 1995,
-      "y": 6.12
-    },
-    {
-      "x": 1996,
-      "y": 7.87
-    },
-    {
-      "x": 1997,
-      "y": 6.73
-    },
-    {
-      "x": 1998,
-      "y": 6.55
-    },
-    {
-      "x": 1999,
-      "y": 6.23
-    },
-    {
-      "x": 2000,
-      "y": 6.31
-    },
-    {
-      "x": 2001,
-      "y": 6.74
-    },
-    {
-      "x": 2002,
-      "y": 5.95
-    },
-    {
-      "x": 2003,
-      "y": 6.13
-    },
-    {
-      "x": 2004,
-      "y": 6.04
-    },
-    {
-      "x": 2005,
-      "y": 5.56
-    },
-    {
-      "x": 2006,
-      "y": 5.91
-    },
-    {
-      "x": 2007,
-      "y": 4.29
-    },
-    {
-      "x": 2008,
-      "y": 4.72
-    },
-    {
-      "x": 2009,
-      "y": 5.38
-    },
-    {
-      "x": 2010,
-      "y": 4.92
-    },
-    {
-      "x": 2011,
-      "y": 4.61
-    },
-    {
-      "x": 2012,
-      "y": 3.62
-    },
-    {
-      "x": 2013,
-      "y": 5.35
-    },
-    {
-      "x": 2014,
-      "y": 5.28
-    },
-    {
-      "x": 2015,
-      "y": 4.63
-    },
-    {
-      "x": 2016,
-      "y": 4.72
-    }
-  ]
\ No newline at end of file
diff --git a/test/unit/create_routes.test.js b/test/unit/create_routes.test.js
index cbc4856..8c2b291 100644
--- a/test/unit/create_routes.test.js
+++ b/test/unit/create_routes.test.js
@@ -1,6 +1,6 @@
 import * as assert from 'assert';
 
-import create_routes from '../../src/shared/utils/create_routes.js';
+import create_routes from '../../src/core/utils/create_routes.js';
 
 describe('create_routes', () => {
 	it('sorts routes correctly', () => {