lazy-load stuff

src/cli/build.ts

@@ -6,7 +6,7 @@ import rimraf from 'rimraf';
 import { create_compilers, create_app, create_routes, create_serviceworker } from '../core'
 import { src, dest, dev } from '../config';
 
-export default async function build() {
+export async function build() {
 	const output = dest();
 
 	mkdirp.sync(output);

src/cli/dev.ts

@@ -70,9 +70,20 @@ function create_hot_update_server(port: number, interval = 10000) {
 	return { send };
 }
 
-export default async function dev(port: number) {
+export async function dev(opts: { port: number }) {
 	process.env.NODE_ENV = 'development';
 
+	let port = opts.port || +process.env.PORT;
+
+	if (port) {
+		if (!await ports.check(port)) {
+			console.log(clorox.bold.red(`> Port ${port} is unavailable`));
+			return;
+		}
+	} else {
+		port = await ports.find(3000);
+	}
+
 	const dir = dest();
 	rimraf.sync(dir);
 	mkdirp.sync(dir);

src/cli/export.ts

@@ -10,7 +10,7 @@ import { dest } from '../config';
 
 const app = polka();
 
-export default async function exporter(export_dir: string) {
+export async function exporter(export_dir: string) {
 	const build_dir = dest();
 
 	// Prep output directory

src/cli/start.ts

@@ -0,0 +1,35 @@
+import * as fs from 'fs';
+import * as path from 'path';
+import * as child_process from 'child_process';
+import * as clorox from 'clorox';
+import * as ports from 'port-authority';
+
+export async function start(dir: string, opts: { port: number }) {
+	let port = opts.port || +process.env.PORT;
+
+	const resolved = path.resolve(dir);
+	const server = path.resolve(dir, 'server.js');
+
+	if (!fs.existsSync(server)) {
+		console.log(clorox.bold.red(`> ${dir}/server.js does not exist — type ${clorox.bold.cyan(dir === 'build' ? `npx sapper build` : `npx sapper build ${dir}`)} to create it`));
+		return;
+	}
+
+	if (port) {
+		if (!await ports.check(port)) {
+			console.log(clorox.bold.red(`> Port ${port} is unavailable`));
+			return;
+		}
+	} else {
+		port = await ports.find(3000);
+	}
+
+	child_process.fork(server, [], {
+		cwd: process.cwd(),
+		env: Object.assign({
+			NODE_ENV: 'production',
+			PORT: port,
+			SAPPER_DEST: dir
+		}, process.env)
+	});
+}