Simplest possible node.js dev environment?

docker-compose.yml

# https://medium.com/@francoisromain/getting-started-with-docker-for-local-node-js-development-192ceca18781
version: "3"

services:
  app:
    image: node:8
    volumes:
      - ./:/home/node/app
    working_dir: "/home/node/app"
    user: "node" # don't use the root user for security reasons
    ports:
      - "3000:3000"
    command: bash # Doesn't work for now. Need to figure out a command that leaves the process running
    # environment:
    #   - NODE_ENV=production

## Then log into the machine with:
# docker-compose up -d
# docker-compose exec app {npm install, bash ...}