Dockerfile

# ─── Stage 1: Install dependencies ────────────────────────────
FROM node:22-alpine AS deps
WORKDIR /app
COPY package*.json ./
RUN npm ci --ignore-scripts

# ─── Stage 2: Build TypeScript ────────────────────────────────
FROM node:22-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY tsconfig.json ./
COPY package*.json ./
COPY src/ src/
RUN npm run build

# ─── Stage 3: Production ─────────────────────────────────────
FROM node:22-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV PORT=8080

# Production deps only (smaller image)
COPY package*.json ./
RUN npm ci --omit=dev --ignore-scripts && npm cache clean --force

COPY --from=builder /app/dist ./dist
COPY --from=builder /app/package.json ./

USER node

EXPOSE 8080

# Health check for Docker / orchestrators
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
  CMD wget -qO- http://localhost:8080/health || exit 1

CMD ["node", "dist/src/index.js"]