Support watching for changing code

Closes #93

Makefile

@@ -66,6 +66,9 @@ dist/po.%.js: po/%.po $(NODE_MODULES_TEST)
 $(WEBPACK_TEST): $(NODE_MODULES_TEST) $(shell find src/ -type f) package.json webpack.config.js $(patsubst %,dist/po.%.js,$(LINGUAS))
 	NODE_ENV=$(NODE_ENV) npm run build
 
+watch:
+	NODE_ENV=$(NODE_ENV) npm run watch
+
 clean:
 	rm -rf dist/
 	[ ! -e cockpit-$(PACKAGE_NAME).spec.in ] || rm -f cockpit-$(PACKAGE_NAME).spec

README.md

@@ -33,6 +33,16 @@ ln -s `pwd`/dist ~/.local/share/cockpit/starter-kit
 After changing the code and running `make` again, reload the Cockpit page in
 your browser.
 
+You can also use
+[watch mode](https://webpack.js.org/guides/development/#using-watch-mode) to
+automatically update the webpack on every code change with
+
+    $ npm run watch
+
+or
+
+    $ make watch
+
 # Running eslint
 
 Cockpit Starter Kit uses [ESLint](https://eslint.org/) to automatically check

package.json

@@ -7,6 +7,7 @@
   "author": "",
   "license": "LGPL-2.1",
   "scripts": {
+    "watch": "webpack --watch",
     "build": "webpack",
     "eslint": "eslint --ext .jsx --ext .es6 src/",
     "eslint:fix": "eslint --fix --ext .jsx --ext .es6 src/"