clarify dependencies in dev and non-dev environments

Dockerfile

@@ -17,26 +17,21 @@ RUN mkdir -p /data/db
 RUN apt-get install nodejs -y
 RUN apt-get install nodejs-legacy -y
 RUN apt-get install npm -y
-RUN npm install -g nodemon
 
-# install typescript
+# for development: auto-restart on changes in backend (nodejs), auto-recompile on changes in frontend (ts->js)
+RUN npm install -g nodemon
 RUN npm install -g typescript
-# install pug
-RUN npm install -g pug
-
-# install jshare for sharing node.js variables with client javascript
-RUN npm install -g jshare
 
 # Create app directory
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
-
 # Install app dependencies
 ADD package.json /usr/src/app/
 RUN npm install
 
 # Bundle app source
+# file changes in . only lead to a rebuild which triggers only these remaining commands
 ADD . /usr/src/app
 
 EXPOSE 8080

docker-compose.yml

@@ -8,6 +8,4 @@ services:
       - .:/usr/src/app
     ports:
       - "8080:8080"
-      - "5858:5858"
-
-# as gratefully discovered here: https://github.com/docker/labs/blob/master/developer-tools/nodejs-debugging/VSCode-README.md
+      - "5858:5858"

package.json

@@ -8,12 +8,11 @@
   	"main": "course-planner.js",
 	"scripts": {
 		"prestart": "mongod --port 27017 --dbpath='/data/db' &",
-		"start": "mongoimport --db db --collection data --file data.json && nodemon -L /usr/src/app/",
+		"start": "mongoimport --db db --collection data --file data.json && node /usr/src/app/",
 		"poststop": "mongod stop"
 	},
-	"devDependencies": {
+	"dependencies": {
 		"express": "~4.14.0",
-		"nodemon": "~1.11.0",
 		"mongoose": "~4.9.2",
 		"typescript": "~2.2.2",
 		"pug": "~2.0.0-beta11",