Update server to support asset change detection

Also did a refactoring on the server to match eslint config.

Author: JosefBredereck

packages/core/src/lib/server.js

@@ -36,6 +36,30 @@ const server = patternlab => {
             patternlab.config.paths.public.root
           )
         );
+        defaults.assets = [
+          path.resolve(
+            path.join(
+              process.cwd(),
+              patternlab.config.paths.source.js,
+              '**',
+              '*.js' // prevent preprocessors like typescript from reloading
+            )
+          ),
+          path.resolve(
+            path.join(process.cwd(), patternlab.config.paths.source.images)
+          ),
+          path.resolve(
+            path.join(process.cwd(), patternlab.config.paths.source.fonts)
+          ),
+          path.resolve(
+            path.join(
+              process.cwd(),
+              patternlab.config.paths.source.css,
+              '**',
+              '*.css' // prevent preprocessors from reloading
+            )
+          ),
+        ];
 
         // allow for overrides should they exist inside patternlab-config.json
         const liveServerConfig = Object.assign(