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Dockerfile
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Dockerfile
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# syntax=docker/dockerfile:1
# Comments are provided throughout this file to help you get started.
# If you need more help, visit the Dockerfile reference guide at
# https://docs.docker.com/go/dockerfile-reference/
ARG NODE_VERSION=20
################################################################################
# Use node image for base image for all stages.
FROM node:${NODE_VERSION}-alpine as base
# Set working directory for all build stages.
WORKDIR /usr/src/app
################################################################################
# Create a stage for installing dependecies.
FROM base as deps
# Download dependencies as a separate step to take advantage of Docker's caching.
# Leverage a cache mount to /root/.yarn to speed up subsequent builds.
# Leverage bind mounts to package.json and yarn.lock to avoid having to copy them
# into this layer.
RUN --mount=type=bind,source=package.json,target=package.json \
--mount=type=bind,source=yarn.lock,target=yarn.lock \
--mount=type=cache,target=/root/.yarn \
yarn install --frozen-lockfile
################################################################################
# Create a stage for building the application.
FROM deps as build
# Copy the rest of the source files into the image.
COPY . .
# Run the build script.
RUN yarn run build
################################################################################
# Create a new stage to run the application with minimal runtime dependencies
# where the necessary files are copied from the build stage.
FROM base as final
# Use production node environment by default.
ENV NODE_ENV production
# Run the application as a non-root user.
USER node
# Copy the built application from the build stage into the image.
COPY --from=build /usr/src/app/.output ./.output
# Expose the port that the application listens on.
EXPOSE 3000
# Run the application.
CMD node .output/server/index.mjs