ARG PORT=3000
ENV PORT=$PORT
# Use the official lightweight Node.js 12 image.
# https://hub.docker.com/_/node
FROM node:12-alpine
# Create and change to the app directory.
WORKDIR /usr/src/app
# Copy application dependency manifests to the container image.
# A wildcard is used to ensure both package.json AND package-lock.json are copied.
# Copying this separately prevents re-running npm install on every code change.
COPY / ./
# Install dependencies.
RUN npm install
# Compile to production
RUN npm run build
EXPOSE ${PORT}
# Run the web service on container startup.
CMD [ "npm", "start" ]