Dockerfile

# Use official Node.js runtime as base image
FROM node:18-alpine

# Set working directory in container
WORKDIR /app

# Copy package.json and package-lock.json (if available)
COPY package*.json ./

# Install all dependencies (including devDependencies for build)
RUN npm ci

# Copy application source code
COPY . .

# Build TypeScript application
RUN npm run build

# Remove devDependencies to reduce image size
RUN npm prune --production

# Create non-root user for security
RUN addgroup -g 1001 -S nodejs
RUN adduser -S appserver -u 1001

# Change ownership of app directory
RUN chown -R appserver:nodejs /app
USER appserver

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD curl -f http://localhost:3000/health || exit 1

# Start the application
CMD ["node", "out/index.js"]