Snippet.

dockerfile13 lines

H A R S H H A A

1 hour ago

Docker multi-stage: drop build layers without losing npm cache mounts

Shaves ~600MB off Node images while keeping npm install fast in CI.

#docker
#ci

Source.

dockerfile

# syntax=docker/dockerfile:1.7
FROM node:22-alpine AS deps
WORKDIR /app
# Cache mount survives layer invalidation — package.json churn no longer re-downloads the world
RUN --mount=type=cache,target=/root/.npm     npm ci --omit=dev

FROM node:22-alpine AS runtime
WORKDIR /app
ENV NODE_ENV=production
COPY --from=deps /app/node_modules ./node_modules
COPY . .
USER node
CMD ["node", "server.js"]

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