Start with:
parcel src/index.html
And then parcel will take care of the rest (creating node_modules, package.json, yarn.lock, dist, etc.).
When built, it's 800kB of JS for development, 102kB in production mode (parcel build src/index.html). :(
Built using parcel 1.9.7, yarn 1.9.4, node 8.11.2.