Dockerfile.dev

#Dockerfile Container for just development
#Production container is just called Dockerfile

#Specify a base image, by using existing docker image 'alpine'
FROM node:alpine
#node:alpine is like an OS, as it comes with a lot of useful pre-installed programs for us to use as our base image

#USER node
#RUN mkdir -p /home/node/app
WORKDIR '/app'

#Install some dependencies
#we are using COPY to take the package.json file in our FRONTEND directory, as they are outside of our base container
COPY package.json .
RUN npm install 
#COPY the rest including index.js. So we did this because we don't want to copy everything at once if a change is made to index.js. This way, we separated our copies so the cache for package.json remains if it's not changed, and only index.js copy is executed. 
COPY . .

#Default command, this tells the image what to do when it starts as a container
CMD ["npm","run","start"]
#so if this new container we made is ever used, we're saying make the start up command "npm run start"

#so all we did here was create a new container by taking the node:alpine base, grabbing the json and js files we made within our FRONTEND directory to the container, adding npm install as part of the container programs along with a start up command, then saving the Image for if we ever want to use it