From 6a4dc1901c820fca01c7ada3a1637ba3b46c6034 Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Sun, 14 Jan 2018 13:45:01 -0500
Subject: [PATCH] Enforce prod mode, return a Promise so it can be used
 programmatically

---
 lib/build.js | 45 +++++++++++++++++++++++++--------------------
 1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/lib/build.js b/lib/build.js
index f51fa7f..445a0ce 100644
--- a/lib/build.js
+++ b/lib/build.js
@@ -1,3 +1,5 @@
+process.env.NODE_ENV = 'production';
+
 const fs = require('fs');
 const path = require('path');
 const mkdirp = require('mkdirp');
@@ -14,29 +16,32 @@ 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);
+	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`));
+			}
 		}
 
-		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, '  '));
 
-	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, '  '));
 
-		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);
+				generate_asset_cache(clientInfo, serverInfo);
+				fulfil();
+			});
 		});
 	});
-};
\ No newline at end of file
+};