adding flag to disable service worker

Author: prateekbh

README.md

@@ -104,7 +104,8 @@ $ preact build
   --src             Entry file (index.js).                        [default: "src"]
   --dest            Directory root for output.                    [default: "build"]
   --production, -p  Create a minified production build.           [default: true]
-  --no-prerender    Disable pre-render of static app content.     
+  --no-prerender    Disable pre-render of static app content.
+  --service-worker  Add a service worker to application.          [default: true]
   --prerenderUrls   Path to pre-render routes configuration.      [default "prerender-urls.json"]
   --template        Path to template file.
   --clean           Clear output directory before building.       [default: true]
@@ -133,16 +134,16 @@ $ preact serve
 
 ### Templates
 
-### Full: 
+### Full:
 
 - Preact Router Included
 - Dynamic routes
 
 <a href="https://build-gqqxvrjtbx.now.sh/" target="_blank">Demo</a>
 
-### Simple: 
+### Simple:
 
-- Github API 
+- Github API
 <a href="https://build-xsepqcgvue.now.sh/" target="_blank">Demo</a>
 
 ### Empty

src/commands/build.js

@@ -31,6 +31,10 @@ export default asyncCommand({
 			description: 'Path to pre-render routes configuration.',
 			default: 'prerender-urls.json'
 		},
+		'service-worker': {
+			description: 'Add a service worker to the application.',
+			default: true
+		},
 		clean: {
 			description: 'Clear output directory before building.',
 			default: true

src/lib/entry.js

@@ -4,7 +4,7 @@ if (process.env.NODE_ENV==='development') {
 	// enable preact devtools
 	require('preact/devtools');
 }
-else if ('serviceWorker' in navigator && location.protocol === 'https:') {
+else if (process.env.ADD_SW && 'serviceWorker' in navigator && location.protocol === 'https:') {
 	navigator.serviceWorker.register('/sw.js');
 }
 

src/lib/webpack/webpack-client-config.js

@@ -199,7 +199,12 @@ const production = config => addPlugins([
 			/push-manifest\.json$/,
 			/.DS_Store/
 		]
-	})
+	}),
+	new webpack.DefinePlugin({
+		'process.env': {
+			'ADD_SW': config['service-worker']
+		}
+	}),
 ]);
 
 const htmlPlugin = (config, src) => {