-> v0.2.1

inject HMR import

.eslintrc.json

@@ -0,0 +1,39 @@
+{
+    "root": true,
+    "rules": {
+        "indent": [ 2, "tab", { "SwitchCase": 1 } ],
+        "semi": [ 2, "always" ],
+        "space-before-blocks": [ 2, "always" ],
+        "no-mixed-spaces-and-tabs": [ 2, "smart-tabs" ],
+        "no-cond-assign": 0,
+        "no-unused-vars": 2,
+        "object-shorthand":  [ 2, "always" ],
+        "no-const-assign": 2,
+        "no-class-assign": 2,
+        "no-this-before-super": 2,
+        "no-var": 2,
+        "no-unreachable": 2,
+        "valid-typeof": 2,
+        "quote-props": [ 2, "as-needed" ],
+        "one-var": [ 2, "never" ],
+        "prefer-arrow-callback": 2,
+        "prefer-const": [ 2, { "destructuring": "all" } ],
+        "arrow-spacing": 2,
+        "no-inner-declarations": 0
+    },
+    "env": {
+        "es6": true,
+        "browser": true,
+        "node": true,
+        "mocha": true
+    },
+    "extends": [
+        "eslint:recommended",
+        "plugin:import/errors",
+        "plugin:import/warnings"
+    ],
+    "parserOptions": {
+        "ecmaVersion": 6,
+        "sourceType": "module"
+    }
+}

CHANGELOG.md

@@ -0,0 +1,26 @@
+# sapper changelog
+
+## 0.2.1
+
+* Inject HMR logic in dev mode
+
+## 0.2.0
+
+* Separate `sapper build` from prod server ([#21](https://github.com/sveltejs/sapper/issues/21))
+
+## 0.1.3-5
+
+* Fix typo
+
+## 0.1.2
+
+* Use `atime.getTime()` and `mtime.getTime()` instead of `atimeMs` and `mtimeMs` ([#11](https://github.com/sveltejs/sapper/issues/11))
+* Make dest dir before anyone tries to write to it ([#18](https://github.com/sveltejs/sapper/pull/18))
+
+## 0.1.1
+
+* Expose resolved pathname to `sapper/runtime/app.js` as `__app__` inside main.js
+
+## 0.1.0
+
+* First public preview

cli/index.js

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+
+const cmd = process.argv[2];
+
+if (cmd === 'build') {
+	process.env.NODE_ENV = 'production';
+	require('../lib/build.js')();
+}

connect.js

@@ -1,115 +0,0 @@
-require('svelte/ssr/register');
-const esm = require('@std/esm');
-const fs = require('fs');
-const path = require('path');
-const glob = require('glob');
-const rimraf = require('rimraf');
-const mkdirp = require('mkdirp');
-const create_routes = require('./lib/utils/create_routes.js');
-const templates = require('./lib/templates.js');
-const create_app = require('./lib/utils/create_app.js');
-const create_webpack_compiler = require('./lib/utils/create_webpack_compiler.js');
-const escape_html = require('escape-html');
-const { src, dest, dev } = require('./lib/config.js');
-
-const esmRequire = esm(module, {
-	esm: 'js'
-});
-
-module.exports = function connect(opts) {
-	mkdirp(dest);
-	rimraf.sync(path.join(dest, '**/*'));
-
-	let routes = create_routes(
-		glob.sync('**/*.+(html|js|mjs)', { cwd: src })
-	);
-
-	create_app(src, dest, routes, opts);
-
-	const webpack_compiler = create_webpack_compiler(
-		dest,
-		routes,
-		dev
-	);
-
-	return async function(req, res, next) {
-		const url = req.url.replace(/\?.+/, '');
-
-		if (url === '/service-worker.js' || url === '/index.html' || url.startsWith('/client/')) {
-			await webpack_compiler.ready;
-			res.set({
-				'Content-Type': url === '/index.html' ? 'text/html' : 'application/javascript'
-			});
-			fs.createReadStream(`${dest}${url}`).pipe(res);
-			return;
-		}
-
-		// whatever happens, we're going to serve some HTML
-		res.set({
-			'Content-Type': 'text/html'
-		});
-
-		try {
-			for (const route of routes) {
-				if (route.test(url)) {
-					await webpack_compiler.ready;
-
-					req.params = route.exec(url);
-
-					const chunk = webpack_compiler.chunks[route.id];
-					const mod = require(path.resolve(dest, 'server', chunk));
-
-					if (route.type === 'page') {
-						let data = { params: req.params, query: req.query };
-						if (mod.default.preload) data = Object.assign(data, await mod.default.preload(data));
-
-						const { html, head, css } = mod.default.render(data);
-
-						const page = templates.render(200, {
-							main: webpack_compiler.client_main,
-							html,
-							head: `<noscript id='sapper-head-start'></noscript>${head}<noscript id='sapper-head-end'></noscript>`,
-							styles: (css && css.code ? `<style>${css.code}</style>` : '')
-						});
-
-						res.status(200);
-						res.end(page);
-					}
-
-					else {
-						const handler = mod[req.method.toLowerCase()];
-						if (handler) {
-							if (handler.length === 2) {
-								handler(req, res);
-							} else {
-								const data = await handler(req);
-
-								// TODO headers, error handling
-								if (typeof data === 'string') {
-									res.end(data);
-								} else {
-									res.end(JSON.stringify(data));
-								}
-							}
-						}
-					}
-
-					return;
-				}
-			}
-
-			res.status(404).end(templates.render(404, {
-				title: 'Not found',
-				status: 404,
-				method: req.method,
-				url
-			}));
-		} catch(err) {
-			res.status(500).end(templates.render(500, {
-				title: err.name || 'Internal server error',
-				url,
-				error: escape_html(err.details || err.message || err || 'Unknown error')
-			}));
-		}
-	};
-};

lib/build.js

@@ -0,0 +1,38 @@
+const fs = require('fs');
+const path = require('path');
+const glob = require('glob');
+const { client, server } = require('./utils/compilers.js');
+const create_app = require('./utils/create_app.js');
+const generate_asset_cache = require('./utils/generate_asset_cache.js');
+const { dest } = require('./config.js');
+
+module.exports = () => {
+	// create main.js and server-routes.js
+	create_app();
+
+	function handleErrors(err, stats) {
+		if (err) {
+			console.error(err ? err.details || err.stack || err.message || err : 'Unknown error');
+			process.exit(1);
+		}
+
+		if (stats.hasErrors()) {
+			console.log(stats.toString({ colors: true }));
+			process.exit(1);
+		}
+	}
+
+	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);
+		});
+	});
+};

lib/config.js

@@ -1,4 +1,6 @@
 const path = require('path');
+const mkdirp = require('mkdirp');
+const rimraf = require('rimraf');
 
 exports.dev = process.env.NODE_ENV !== 'production';
 
@@ -9,4 +11,11 @@ exports.src = path.resolve(process.env.SAPPER_ROUTES || 'routes');
 exports.dest = path.resolve(
 	process.env.NOW ? '/tmp' :
 	process.env.SAPPER_DEST || '.sapper'
-);
+);
+
+if (exports.dev) {
+	mkdirp(exports.dest);
+	rimraf.sync(path.join(exports.dest, '**/*'));
+}
+
+exports.server_routes = path.resolve(exports.dest, 'server-routes.js');

lib/index.js

@@ -0,0 +1,208 @@
+const fs = require('fs');
+const path = require('path');
+const glob = require('glob');
+const rimraf = require('rimraf');
+const mkdirp = require('mkdirp');
+const webpack = require('webpack');
+const route_manager = require('./route_manager.js');
+const templates = require('./templates.js');
+const create_app = require('./utils/create_app.js');
+const create_watcher = require('./utils/create_watcher.js');
+const compilers = require('./utils/compilers.js');
+const generate_asset_cache = require('./utils/generate_asset_cache.js');
+const escape_html = require('escape-html');
+const { src, dest, dev } = require('./config.js');
+
+function connect_dev() {
+	// create main.js and server-routes.js
+	// TODO update on changes
+	create_app();
+
+	const watcher = create_watcher();
+
+	let asset_cache;
+
+	return compose_handlers([
+		require('webpack-hot-middleware')(compilers.client, {
+			reload: true,
+			path: '/__webpack_hmr',
+			heartbeat: 10 * 1000
+		}),
+
+		async (req, res, next) => {
+			asset_cache = await watcher.ready;
+			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),
+
+		not_found
+	]);
+}
+
+function connect_prod() {
+	const asset_cache = generate_asset_cache(
+		read_json(path.join(dest, 'stats.client.json')),
+		read_json(path.join(dest, 'stats.server.json'))
+	);
+
+	return 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),
+
+		not_found
+	]);
+}
+
+module.exports = 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.set({
+			'Content-Type': opts.type,
+			'Cache-Control': opts.cache
+		});
+		res.end(opts.fn(req.pathname));
+	};
+}
+
+function get_route_handler(fn) {
+	return async function handle_route(req, res, next) {
+		const url = req.pathname;
+
+		const { client, server } = fn();
+
+		// whatever happens, we're going to serve some HTML
+		res.set({
+			'Content-Type': 'text/html'
+		});
+
+		try {
+			for (const route of route_manager.routes) {
+				if (route.test(url)) {
+					req.params = route.exec(url);
+
+					const mod = require(server.entry)[route.id];
+
+					if (route.type === 'page') {
+						let data = { params: req.params, query: req.query };
+						if (mod.preload) data = Object.assign(data, await mod.preload(data));
+
+						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.status(200);
+						res.end(page);
+					}
+
+					else {
+						const handler = mod[req.method.toLowerCase()];
+						if (handler) handler(req, res, next);
+					}
+
+					return;
+				}
+			}
+
+			next();
+		} catch(err) {
+			res.status(500).end(templates.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 not_found(req, res) {
+	res.status(404).end(templates.render(404, {
+		title: 'Not found',
+		status: 404,
+		method: req.method,
+		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(file) {
+	return JSON.parse(fs.readFileSync(file, 'utf-8'));
+}

lib/utils/compilers.js

@@ -0,0 +1,11 @@
+const path = require('path');
+const relative = require('require-relative');
+const webpack = relative('webpack', process.cwd());
+
+exports.client = webpack(
+	require(path.resolve('webpack.client.config.js'))
+);
+
+exports.server = webpack(
+	require(path.resolve('webpack.server.config.js'))
+);

lib/utils/create_app.js

@@ -1,26 +1,64 @@
 const fs = require('fs');
 const path = require('path');
+const route_manager = require('../route_manager.js');
+const { src, dest, server_routes, dev } = require('../config.js');
 
-const template = fs.readFileSync(path.resolve(__dirname, '../../templates/main.js'), 'utf-8');
+module.exports = function create_app() {
+	const { routes } = route_manager;
+
+	function create_client_main() {
+		const template = fs.readFileSync('templates/main.js', 'utf-8');
+
+		const code = `[${
+			routes
+				.filter(route => route.type === 'page')
+				.map(route => {
+					const params = route.dynamic.length === 0 ?
+						'{}' :
+						`{ ${route.dynamic.map((part, i) => `${part}: match[${i + 1}]`).join(', ') } }`;
+
+					return `{ pattern: ${route.pattern}, params: match => (${params}), load: () => import(/* webpackChunkName: "${route.id}" */ '${src}/${route.file}') }`
+				})
+				.join(', ')
+		}]`;
+
+		let main = template
+			.replace(/__app__/g, path.resolve(__dirname, '../../runtime/app.js'))
+			.replace(/__routes__/g, code)
+			.replace(/__dev__/g, String(dev));
+
+		if (dev) {
+			const hmr_client = require.resolve(`webpack-hot-middleware/client`);
+			main += `\n\nimport('${hmr_client}?path=/__webpack_hmr&timeout=20000'); if (module.hot) module.hot.accept();`
+		}
+
+		const file = path.resolve(dest, 'main.js');
+
+		fs.writeFileSync(file, main);
+
+		// need to fudge the mtime, because webpack is soft in the head
+		const { atime, mtime } = fs.statSync(file);
+		fs.utimesSync(file, new Date(atime.getTime() - 999999), new Date(mtime.getTime() - 999999));
+	}
+
+	function create_server_routes() {
+		const imports = routes
+			.map(route => {
+				return route.type === 'page' ?
+					`import ${route.id} from '${src}/${route.file}';` :
+					`import * as ${route.id} from '${src}/${route.file}';`;
+			})
+			.join('\n');
+
+		const exports = `export { ${routes.map(route => route.id)} };`;
+
+		fs.writeFileSync(server_routes, `${imports}\n\n${exports}`);
+
+		const { atime, mtime } = fs.statSync(server_routes);
+		fs.utimesSync(server_routes, new Date(atime.getTime() - 999999), new Date(mtime.getTime() - 999999));
+	}
 
-module.exports = function create_app(src, dest, routes, options) {
 	// TODO in dev mode, watch files
-
-	const code = routes
-		.filter(route => route.type === 'page')
-		.map(route => {
-			const params = route.dynamic.length === 0 ?
-				'{}' :
-				`{ ${route.dynamic.map((part, i) => `${part}: match[${i + 1}]`).join(', ') } }`;
-
-			return `{ pattern: ${route.pattern}, params: match => (${params}), load: () => import('${src}/${route.file}') }`
-		})
-		.join(',\n\t');
-
-	const main = template
-		.replace('__app__', path.resolve(__dirname, '../../runtime/app.js'))
-		.replace('__selector__', options.selector || 'main')
-		.replace('__routes__', code);
-
-	fs.writeFileSync(path.join(dest, 'main.js'), main);
+	create_client_main();
+	create_server_routes();
 };

lib/utils/create_routes.js

@@ -8,7 +8,9 @@ module.exports = function create_matchers(files) {
 			const parts = file.replace(/\.(html|js|mjs)$/, '').split(path.sep);
 			if (parts[parts.length - 1] === 'index') parts.pop();
 
-			const id = parts.join('_').replace(/[[\]]/g, '$') || '_';
+			const id = (
+				parts.join('_').replace(/[[\]]/g, '$').replace(/^\d/, '_$&').replace(/[^a-zA-Z0-9_$]/g, '_')
+			 ) || '_';
 
 			const dynamic = parts
 				.filter(part => part[0] === '[')

lib/utils/create_watcher.js

@@ -0,0 +1,63 @@
+const path = require('path');
+const chalk = require('chalk');
+const compilers = require('./compilers.js');
+const generate_asset_cache = require('./generate_asset_cache.js');
+
+function deferred() {
+	const d = {};
+
+	d.promise = new Promise((fulfil, reject) => {
+		d.fulfil = fulfil;
+		d.reject = reject;
+	});
+
+	return d;
+}
+
+module.exports = function create_watcher() {
+	const deferreds = {
+		client: deferred(),
+		server: deferred()
+	};
+
+	const invalidate = () => Promise.all([
+		deferreds.client.promise,
+		deferreds.server.promise
+	]).then(([client_stats, server_stats]) => {
+		return generate_asset_cache(
+			client_stats.toJson(),
+			server_stats.toJson()
+		);
+	});
+
+	watcher = {
+		ready: invalidate()
+	};
+
+	function watch_compiler(type) {
+		const compiler = compilers[type];
+
+		compiler.plugin('invalid', filename => {
+			console.log(chalk.red(`${type} bundle invalidated, file changed: ${chalk.bold(filename)}`));
+			deferreds[type] = deferred();
+			watcher.ready = invalidate();
+		});
+
+		compiler.plugin('failed', err => {
+			deferreds[type].reject(err);
+		});
+
+		compiler.watch({}, (err, stats) => {
+			if (stats.hasErrors()) {
+				deferreds[type].reject(stats.toJson().errors[0]);
+			} else {
+				deferreds[type].fulfil(stats);
+			}
+		});
+	}
+
+	watch_compiler('client');
+	watch_compiler('server');
+
+	return watcher;
+};

lib/utils/create_webpack_compiler.js

@@ -1,100 +0,0 @@
-const fs = require('fs');
-const path = require('path');
-const glob = require('glob');
-const webpack = require('webpack');
-const templates = require('../templates.js');
-
-module.exports = function create_webpack_compiler(dest, routes, dev) {
-	const compiler = {};
-
-	const client = webpack(
-		require(path.resolve('webpack.client.config.js'))
-	);
-
-	const server = webpack(
-		require(path.resolve('webpack.server.config.js'))
-	);
-
-	if (false) { // TODO watch in dev
-		// TODO how can we invalidate compiler.client_main when watcher restarts?
-		compiler.client_main = new Promise((fulfil, reject) => {
-			client.watch({}, (err, stats) => {
-				if (err || stats.hasErrors()) {
-					// TODO handle errors
-				}
-
-				const filename = stats.toJson().assetsByChunkName.main;
-				fulfil(`/client/${filename}`);
-			});
-		});
-
-		// TODO server
-	} else {
-		compiler.ready = Promise.all([
-			new Promise((fulfil, reject) => {
-				client.run((err, stats) => {
-					console.log(stats.toString({ colors: true }));
-
-					const info = stats.toJson();
-
-					if (err || stats.hasErrors()) {
-						reject(err || info.errors[0]);
-					}
-
-					compiler.client_main = `/client/${info.assetsByChunkName.main}`;
-					compiler.assets = info.assets.map(asset => `/client/${asset.name}`);
-
-					fulfil();
-				});
-			}),
-
-			new Promise((fulfil, reject) => {
-				server.run((err, stats) => {
-					console.log(stats.toString({ colors: true }));
-
-					const info = stats.toJson();
-
-					if (err || stats.hasErrors()) {
-						reject(err || info.errors[0]);
-					}
-
-					compiler.chunks = info.assetsByChunkName;
-
-					fulfil();
-				});
-			})
-		]).then(() => {
-			const assets = glob.sync('**', { cwd: 'assets' });
-
-			const route_code = `[${
-				routes
-					.filter(route => route.type === 'page')
-					.map(route => `{ pattern: ${route.pattern} }`)
-					.join(', ')
-			}]`;
-
-			const service_worker = fs.readFileSync('templates/service-worker.js', 'utf-8')
-				.replace('__timestamp__', Date.now())
-				.replace('__assets__', JSON.stringify(assets))
-				.replace('__shell__', JSON.stringify(compiler.assets.concat('/index.html')))
-				.replace('__routes__', route_code);
-
-			fs.writeFileSync(path.resolve(dest, 'service-worker.js'), service_worker);
-
-			const shell = templates.render(200, {
-				styles: '',
-				head: '',
-				html: '',
-				main: compiler.client_main
-			});
-
-			fs.writeFileSync(path.resolve(dest, 'index.html'), shell);
-		});
-
-		compiler.get_chunk = async id => {
-			return path.resolve(dest, 'server', compiler.chunks[id]);
-		};
-	}
-
-	return compiler;
-};

lib/utils/generate_asset_cache.js

@@ -0,0 +1,67 @@
+const fs = require('fs');
+const path = require('path');
+const glob = require('glob');
+const templates = require('../templates.js');
+const route_manager = require('../route_manager.js');
+const { dest } = require('../config.js');
+
+module.exports = function generate_asset_cache(clientInfo, serverInfo) {
+	const main_file = `/client/${clientInfo.assetsByChunkName.main}`;
+	const chunk_files = clientInfo.assets.map(chunk => `/client/${chunk.name}`);
+
+	const service_worker = generate_service_worker(chunk_files);
+	const index = generate_index(main_file);
+
+	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;
+			}, {}),
+
+			index,
+			service_worker
+		},
+
+		server: {
+			entry: path.resolve(dest, 'server', serverInfo.assetsByChunkName.server_routes)
+		}
+	};
+};
+
+function generate_service_worker(chunk_files) {
+	const assets = glob.sync('**', { cwd: 'assets', nodir: true });
+
+	const route_code = `[${
+		route_manager.routes
+			.filter(route => route.type === 'page')
+			.map(route => `{ pattern: ${route.pattern} }`)
+			.join(', ')
+	}]`;
+
+	return read('templates/service-worker.js')
+		.replace('__timestamp__', Date.now())
+		.replace('__assets__', JSON.stringify(assets))
+		.replace('__shell__', JSON.stringify(chunk_files.concat('/index.html')))
+		.replace('__routes__', route_code);
+}
+
+function generate_index(main_file) {
+	return templates.render(200, {
+		styles: '',
+		head: '',
+		html: '<noscript>Please enable JavaScript!</noscript>',
+		main: main_file
+	});
+}
+
+function read(file) {
+	return fs.readFileSync(file, 'utf-8');
+}

package.json

@@ -1,24 +1,27 @@
 {
   "name": "sapper",
-  "version": "0.0.14",
-  "description": "Combat-ready apps, engineered by Svelte",
-  "main": "connect.js",
+  "version": "0.2.1",
+  "description": "Military-grade apps, engineered by Svelte",
+  "main": "lib/index.js",
+  "bin": {
+    "sapper": "cli/index.js"
+  },
   "directories": {
     "test": "test"
   },
   "dependencies": {
-    "@std/esm": "^0.18.0",
+    "chalk": "^2.3.0",
     "escape-html": "^1.0.3",
     "mkdirp": "^0.5.1",
+    "relative": "^3.0.2",
+    "require-relative": "^0.8.7",
     "rimraf": "^2.6.2",
-    "webpack": "^3.10.0"
+    "webpack": "^3.10.0",
+    "webpack-hot-middleware": "^2.21.0"
   },
   "devDependencies": {
-    "mocha": "^4.0.1",
-    "svelte": "^1.47.1"
-  },
-  "peerDependencies": {
-    "svelte": "^1.47.1"
+    "eslint": "^4.13.1",
+    "mocha": "^4.0.1"
   },
   "scripts": {
     "test": "mocha --opts mocha.opts"
@@ -36,8 +39,5 @@
   "bugs": {
     "url": "https://github.com/sveltejs/sapper/issues"
   },
-  "homepage": "https://github.com/sveltejs/sapper#readme",
-  "@std/esm": {
-    "esm": "js"
-  }
+  "homepage": "https://github.com/sveltejs/sapper#readme"
 }

runtime/app.js

@@ -2,103 +2,191 @@ const detach = node => {
 	node.parentNode.removeChild(node);
 };
 
-let component;
+export let component;
+let target;
+let routes;
 
-const app = {
-	init(target, routes) {
-		function select_route(url) {
-			if (url.origin !== window.location.origin) return null;
+const scroll_history = {};
+let uid = 1;
+let cid;
 
-			for (const route of routes) {
-				const match = route.pattern.exec(url.pathname);
-				if (match) {
-					const params = route.params(match);
+if ('scrollRestoration' in history) {
+	history.scrollRestoration = 'manual'
+}
 
-					const query = {};
-					for (const [key, value] of url.searchParams) query[key] = value || true;
+function select_route(url) {
+	if (url.origin !== window.location.origin) return null;
 
-					return { route, data: { params, query } };
-				}
-			}
+	for (const route of routes) {
+		const match = route.pattern.exec(url.pathname);
+		if (match) {
+			const params = route.params(match);
+
+			const query = {};
+			for (const [key, value] of url.searchParams) query[key] = value || true;
+
+			return { route, data: { params, query } };
 		}
-
-		function render(Component, data) {
-			Promise.resolve(
-				Component.preload ? Component.preload(data) : {}
-			).then(preloaded => {
-				if (component) {
-					component.destroy();
-				} else {
-					// first load — remove SSR'd <head> contents
-					const start = document.querySelector('#sapper-head-start');
-					let end = document.querySelector('#sapper-head-end');
-
-					if (start && end) {
-						while (start.nextSibling !== end) detach(start.nextSibling);
-						detach(start);
-						detach(end);
-					}
-
-					// preload additional routes
-					routes.reduce((promise, route) => promise.then(route.load), Promise.resolve());
-				}
-
-				component = new Component({
-					target,
-					data: Object.assign(data, preloaded),
-					hydrate: !!component
-				});
-			});
-		}
-
-		function navigate(url) {
-			const selected = select_route(url);
-			if (selected) {
-				selected.route.load().then(mod => {
-					render(mod.default, selected.data);
-				});
-
-				return true;
-			}
-		}
-
-		function findAnchor(node) {
-			while (node && node.nodeName !== 'A') node = node.parentNode;
-			return node;
-		}
-
-		window.addEventListener('click', event => {
-			const a = findAnchor(event.target);
-			if (!a) return;
-
-			if (navigate(new URL(a.href))) {
-				event.preventDefault();
-				history.pushState({}, '', a.href);
-			}
-		});
-
-		function preload(event) {
-			const a = findAnchor(event.target);
-			if (!a || a.rel !== 'prefetch') return;
-
-			const selected = select_route(new URL(a.href));
-
-			if (selected) {
-				selected.route.load().then(mod => {
-					if (mod.default.preload) mod.default.preload(selected.data);
-				});
-			}
-		}
-
-		window.addEventListener('touchstart', preload);
-		window.addEventListener('mouseover', preload);
-
-		window.addEventListener('popstate', event => {
-			navigate(new URL(window.location));
-		});
-
-		navigate(new URL(window.location));
 	}
-};
+}
 
-export default app;
+function render(Component, data, scroll) {
+	Promise.resolve(
+		Component.preload ? Component.preload(data) : {}
+	).then(preloaded => {
+		if (component) {
+			component.destroy();
+		} else {
+			// first load — remove SSR'd <head> contents
+			const start = document.querySelector('#sapper-head-start');
+			let end = document.querySelector('#sapper-head-end');
+
+			if (start && end) {
+				while (start.nextSibling !== end) detach(start.nextSibling);
+				detach(start);
+				detach(end);
+			}
+
+			// preload additional routes
+			routes.reduce((promise, route) => promise.then(route.load), Promise.resolve());
+		}
+
+		component = new Component({
+			target,
+			data: Object.assign(data, preloaded),
+			hydrate: !!component
+		});
+
+		if (scroll) {
+			window.scrollTo(scroll.x, scroll.y);
+		}
+	});
+}
+
+function navigate(url, id) {
+	const selected = select_route(url);
+	if (selected) {
+		if (id) {
+			// popstate or initial navigation
+			cid = id;
+		} else {
+			// clicked on a link. preserve scroll state
+			scroll_history[cid] = scroll_state();
+
+			id = cid = ++uid;
+			scroll_history[cid] = { x: 0, y: 0 };
+
+			history.pushState({ id }, '', url.href);
+		}
+
+		selected.route.load().then(mod => {
+			render(mod.default, selected.data, scroll_history[id]);
+		});
+
+		cid = id;
+		return true;
+	}
+}
+
+function handle_click(event) {
+	// Adapted from https://github.com/visionmedia/page.js
+	// MIT license https://github.com/visionmedia/page.js#license
+	if (which(event) !== 1) return;
+	if (event.metaKey || event.ctrlKey || event.shiftKey) return;
+	if (event.defaultPrevented) return;
+
+	const a = findAnchor(event.target);
+	if (!a) return;
+
+	// check if link is inside an svg
+	// in this case, both href and target are always inside an object
+	const svg = typeof a.href === 'object' && a.href.constructor.name === 'SVGAnimatedString';
+	const href = svg ? a.href.baseVal : a.href;
+
+	if (href === window.location.href) {
+		event.preventDefault();
+		return;
+	}
+
+	// Ignore if tag has
+	// 1. 'download' attribute
+	// 2. rel='external' attribute
+	if (a.hasAttribute('download') || a.getAttribute('rel') === 'external') return;
+
+	// Ignore if <a> has a target
+	if (svg ? a.target.baseVal : a.target) return;
+
+	const url = new URL(href);
+
+	// Don't handle hash changes
+	if (url.pathname === window.location.pathname && url.search === window.location.search) return;
+
+	if (navigate(url, null)) {
+		event.preventDefault();
+	}
+}
+
+function handle_popstate(event) {
+	scroll_history[cid] = scroll_state();
+
+	if (event.state) {
+		navigate(new URL(window.location), event.state.id);
+	} else {
+		// hashchange
+		cid = ++uid;
+		history.replaceState({ id: cid }, '', window.location.href);
+	}
+}
+
+function prefetch(event) {
+	const a = findAnchor(event.target);
+	if (!a || a.rel !== 'prefetch') return;
+
+	const selected = select_route(new URL(a.href));
+
+	if (selected) {
+		selected.route.load().then(mod => {
+			if (mod.default.preload) mod.default.preload(selected.data);
+		});
+	}
+}
+
+function findAnchor(node) {
+	while (node && node.nodeName.toUpperCase() !== 'A') node = node.parentNode; // SVG <a> elements have a lowercase name
+	return node;
+}
+
+let inited;
+
+export function init(_target, _routes) {
+	target = _target;
+	routes = _routes;
+
+	if (!inited) { // this check makes HMR possible
+		window.addEventListener('click', handle_click);
+		window.addEventListener('popstate', handle_popstate);
+
+		// prefetch
+		window.addEventListener('touchstart', prefetch);
+		window.addEventListener('mouseover', prefetch);
+
+		inited = true;
+	}
+
+	const scroll = scroll_history[uid] = scroll_state();
+
+	history.replaceState({ id: uid }, '', window.location.href);
+	navigate(new URL(window.location), uid);
+}
+
+function which(event) {
+	event = event || window.event;
+	return event.which === null ? event.button : event.which;
+}
+
+function scroll_state() {
+	return {
+		x: window.scrollX,
+		y: window.scrollY
+	};
+}

templates/main.js

@@ -1,5 +0,0 @@
-import app from '__app__';
-
-app.init(document.querySelector('__selector__'), [
-	__routes__
-]);

test/unit/create_routes.test.js

@@ -1,7 +1,7 @@
 const path = require('path');
 const assert = require('assert');
 
-const create_matchers = require('./create_matchers.js');
+const create_matchers = require('../../lib/utils/create_routes.js');
 
 describe('create_matchers', () => {
 	it('sorts routes correctly', () => {

webpack/config.js

@@ -1,6 +1,6 @@
 const path = require('path');
 const route_manager = require('../lib/route_manager.js');
-const { src, dest, dev } = require('../lib/config.js');
+const { src, dest, dev, server_routes } = require('../lib/config.js');
 
 module.exports = {
 	dev,
@@ -16,7 +16,7 @@ module.exports = {
 			return {
 				path: `${dest}/client`,
 				filename: '[name].[hash].js',
-				chunkFilename: '[name].[id].js',
+				chunkFilename: '[name].[id].[hash].js',
 				publicPath: '/client/'
 			};
 		}
@@ -24,18 +24,16 @@ module.exports = {
 
 	server: {
 		entry: () => {
-			const entries = {};
-			route_manager.routes.forEach(route => {
-				entries[route.id] = path.resolve(src, route.file);
-			});
-			return entries;
+			return {
+				server_routes
+			}
 		},
 
 		output: () => {
 			return {
 				path: `${dest}/server`,
 				filename: '[name].[hash].js',
-				chunkFilename: '[name].[id].js',
+				chunkFilename: '[name].[id].[hash].js',
 				libraryTarget: 'commonjs2'
 			};
 		}

webpack/hmr.js

@@ -0,0 +1 @@
+import 'webpack-hot-middleware/client?path=/__webpack_hmr&timeout=20000';