Dockerfile.yjs

# Lightweight container for the Hocuspocus/Yjs WebSocket server.
# This is the only backend service that didn't already have a Dockerfile —
# langgraph-api uses Dockerfile.agent, the rest are off-the-shelf images.
FROM node:20-alpine

WORKDIR /app

# Only the deps Hocuspocus needs at runtime — pulling the full project
# `package.json` would drag in next, react, prisma, etc., so we install a
# minimal set explicitly. Pin to the ranges already in package.json.
RUN apk add --no-cache --virtual .build-deps tini \
    && npm init -y >/dev/null \
    && npm pkg set type=module \
    && npm install --omit=dev --no-audit --no-fund \
       @hocuspocus/server@^3.4.3 \
       yjs@^13.6.27

COPY yjs-server.js ./yjs-server.js

ENV NODE_ENV=production
ENV YJS_PORT=1234
EXPOSE 1234

# tini reaps zombies and forwards SIGTERM properly so K8s rolling restarts
# actually trigger the graceful shutdown handler in yjs-server.js.
ENTRYPOINT ["/sbin/tini", "--"]
CMD ["node", "yjs-server.js"]