From 7f98d50e1543a0fd631c5c5e51f791dcee5237a2 Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Sat, 10 Mar 2018 10:09:18 -0500
Subject: [PATCH] treat PORT=xxxx the same as --port xxxx

---
 src/cli/index.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/cli/index.ts b/src/cli/index.ts
index 20ab237..de5b1f1 100755
--- a/src/cli/index.ts
+++ b/src/cli/index.ts
@@ -17,7 +17,9 @@ const prog = sade('sapper').version(pkg.version);
 prog.command('dev')
 	.describe('Start a development server')
 	.option('-p, --port', 'Specify a port')
-	.action(async ({ port }: { port: number }) => {
+	.action(async (opts: { port: number }) => {
+		let port = opts.port || +process.env.PORT;
+
 		if (port) {
 			if (!await ports.check(port)) {
 				console.log(chalk.bold.red(`> Port ${port} is unavailable`));
@@ -53,7 +55,9 @@ prog.command('build [dest]')
 prog.command('start [dir]')
 	.describe('Start your app')
 	.option('-p, --port', 'Specify a port')
-	.action(async (dir = 'build', { port }: { port: number }) => {
+	.action(async (dir = 'build', opts: { port: number }) => {
+		let port = opts.port || +process.env.PORT;
+
 		const resolved = path.resolve(dir);
 		const server = path.resolve(dir, 'server.js');