Dockerfile

# Multi-stage build for production
FROM node:18-alpine AS base

# Install dependencies only when needed
FROM base AS deps
WORKDIR /app

# Copy package files
COPY package.json package-lock.json ./

# Install dependencies
RUN npm ci --only=production && npm cache clean --force

# Development stage
FROM base AS development
WORKDIR /app

# Copy package files
COPY package.json package-lock.json ./

# Install all dependencies (including dev dependencies)
RUN npm ci

# Copy source code
COPY . .

# Expose port
EXPOSE 3000

# Start in development mode
CMD ["npm", "run", "dev"]

# Production stage
FROM base AS production
WORKDIR /app

# Set NODE_ENV
ENV NODE_ENV=production

# Copy dependencies from deps stage
COPY --from=deps /app/node_modules ./node_modules

# Copy source code
COPY . .

# Install wget for health checks
RUN apk add --no-cache wget

# Create non-root user
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001 && \
    chown -R nodejs:nodejs /app

# Switch to non-root user
USER nodejs

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/health || exit 1

# Start production server
CMD ["node", "src/index.js"]