Dockerfile

#
# Build Production Artifacts
# ==========================================
#
# this first step takes in the source files and build the artifacts
# (basicall all that need to be transpiled).
#
# We do install the NPM dependencies twice so to copy over to the
# production image only what is strictly needed to execute our app.
#
# NPM Install is the first step so to exploit Docker's cache mechanism
# and speed up the building process. We will re-install from NPM only
# if we touch the `package.json` file.
#
# Which doesn't happen so often.
# Hopefully.
#

FROM node:13.10-alpine AS builder

# NPM Install for building
WORKDIR /usr/src/app-build
ADD package.json /usr/src/app-build
ADD package-lock.json /usr/src/app-build
RUN npm install

# Copy source files:
WORKDIR /usr/src/app-build
ADD src /usr/src/app-build/src
ADD public /usr/src/app-build/public

# Build:
WORKDIR /usr/src/app-build
RUN npm run build

# Remove dev dependencies
RUN npm prune --production


#
# Runner Image
# ==========================================
#
# In this step we start over with a fresh image and copy only what is
# strictly necessary in order to run a production build.
#
# The idea is to keep this image as small as possible.
#

FROM node:13.10-alpine AS runner

# Copy project specific assets:
WORKDIR /usr/src/app
COPY --from=builder /usr/src/app-build/node_modules ./node_modules
COPY --from=builder /usr/src/app-build/build ./build
ADD ssr /usr/src/app/ssr

# Default environment configuration:
EXPOSE 8080
ENV NODE_ENV=production

WORKDIR /usr/src/app
CMD node ssr/index.js