Automatically minify js files for distribution

Makefile

@@ -1,5 +1,5 @@
 all:
-	npm run build
+	NODE_ENV=$(NODE_ENV) npm run build
 
 clean:
 	rm -rf dist/
@@ -9,7 +9,9 @@ install: all
 	mkdir -p /usr/share/cockpit/subscription-manager
 	cp -r dist/* /usr/share/cockpit/subscription-manager
 
-dist-gzip: all
+# when building a distribution tarball, call webpack with a 'production' environment
+dist-gzip: NODE_ENV=production
+dist-gzip: clean all
 	mkdir -p _install/usr/share/cockpit
 	cp -r dist/ _install/usr/share/cockpit/subscription-manager
 	mkdir -p _install/usr/share/metainfo/

webpack.config.js

@@ -1,6 +1,7 @@
 const path = require("path");
 const copy = require("copy-webpack-plugin");
 const fs = require("fs");
+const webpack = require("webpack");
 
 var externals = {
     "cockpit": "cockpit",
@@ -13,6 +14,9 @@ const distdir = builddir + path.sep + "dist";
 const section = process.env.ONLYDIR || null;
 const nodedir = path.resolve((process.env.SRCDIR || __dirname), "node_modules");
 
+/* A standard nodejs and webpack pattern */
+var production = process.env.NODE_ENV === 'production';
+
 var info = {
     entries: {
         "index": [
@@ -73,9 +77,27 @@ info.files.forEach(function(value) {
 info.files = files;
 
 var plugins = [
+    new webpack.DefinePlugin({
+        'process.env': {
+            'NODE_ENV': JSON.stringify(production ? 'production' : 'development')
+        }
+    }),
     new copy(info.files)
 ];
 
+/* Only minimize when in production mode */
+if (production) {
+    plugins.unshift(new webpack.optimize.UglifyJsPlugin({
+        beautify: true,
+        compress: {
+            warnings: false
+        },
+    }));
+
+    /* Rename output files when minimizing */
+    output.filename = "[name].min.js";
+}
+
 module.exports = {
     entry: info.entries,
     externals: externals,