#################################################################
# Step 1: Initial build using the `yarn build` command          #
#################################################################
# Note: Make sure the right version of node your application    #
# requires is set here and in all other build steps.            #
#################################################################
FROM node:13 as build

# Prepare the build directory
RUN mkdir -p /opt/build;

WORKDIR /opt/build

# If your build step requires environment variables too, add them here

# Copy required files
# Note: I specify each file directly here to avoid copying over
# existing /dist folder or other dev files like .env
COPY ./src ./src
COPY [ "package.json", "yarn.lock", "tsconfig.json", "./" ]

RUN yarn install --no-progress && yarn build


#################################################################
# Step 2: Fetch production-only dependencies                    #
#################################################################
# Note: Make sure the right version of node your application    #
# requires is set here and in all other build steps.            #
#################################################################
FROM node:13 as dependencies

# Set environment to production
ENV NODE_ENV='production'

RUN mkdir -p /opt/build;

WORKDIR /opt/build

COPY --from=build [ "/opt/build/package.json", "/opt/build/yarn.lock", "./" ]

RUN yarn install --production=true --no-progress


#################################################################
# Step 3: Build done, create the deployable/runnable image step #
#################################################################
# Note: Make sure the right version of node your application    #
# requires is set here and in all other build steps.            #
#################################################################
FROM node:13-slim as release

# Set environment to production
ENV NODE_ENV='production'

# Prepare the app directory
RUN mkdir -p /opt/app;

WORKDIR /opt/app

# Add any and all environment variables your application needs here:
ENV JWT_SECRET= \
    PORT=80

# Copy dependencies and compiled application from previous steps
COPY --from=dependencies /opt/build/node_modules /opt/app/node_modules
COPY --from=build /opt/build/dist /opt/app/dist

WORKDIR /opt/app

# Run the application using node
ENTRYPOINT [ "node", "dist/index.js" ]

# Alternatively: Run your application using Forever (ensure this is installed as a dependency first)
# See: https://github.com/foreversd/forever
# ENTRYPOINT [ "./node_modules/.bin/forever", "./dist/index.js" ]