Dockerfile

# syntax = docker/dockerfile:1

# Adjust NODE_VERSION as desired
ARG NODE_VERSION=20.3.1
FROM node:${NODE_VERSION}-slim AS base

LABEL fly_launch_runtime="NodeJS"

# NodeJS app lives here
WORKDIR /app

# Set production environment
ENV NODE_ENV=production

# Throw-away build stage to reduce size of final image
FROM base AS build

# Install node modules
COPY --link package.json package-lock.json ./
RUN npm install --production=false

# Copy application code
COPY --link . .

# Remove development dependencies
RUN npm prune --production

# Final stage for app image
FROM base

# Copy built application
COPY --from=build /app /app

# Start the server by default, this can be overwritten at runtime
CMD [ "npm", "run", "start" ]