anchor.diff:  
   # base path for React Router
   ARG basename
  -ENV REACT_APP_BASENAME $basename
  +ENV REACT_APP_BASENAME ${basename:-stockcenter}
   
   # Setup client keys for third party auth
   ARG client_keys
  
positive.code: # Use same node path
  ENV NODE_PATH src
  
  # install dependencies
  RUN npm install
  
  # build app
  RUN npm run build
  
  
  
  
negative.code: # It's a multi stage build https://docs.docker.com/develop/develop-images/multistage-build/#stop-at-a-specific-build-stage
  # The first one build single file js for the web app
  # The second one copies the file and server with a golang static web server
  FROM node:8.11.2-alpine
  LABEL maintainer "Siddhartha Basu <siddhartha-basu@northwestern.edu>"
  LABEL maintainer "Eric Hartline <eric.hartline@northwestern.edu>"
  