Are you supposed to npm install graphcool, graphcool-cli and graphcool-framework?

no, pick

graphcool-framework

for the framework, and

graphcool

for the 1.0 developer preview 🙂

Thanks 🙂 Also is it any difference when writing resolvers in JS or TS?

No, they are completely the same, using TS you only gives you type-safeness and better suggestions in VSCode 😄