How to use a class instance as my query root (rootValue from graphql-js)

[captbaritone]

I have a server which currently uses a class instance for each type. This includes Query. All of my top level fields are methods of my query class. As I look to adopt Yoga, I'm unclear where I would construct my query root object.

Here's a minimal example showing what I'm trying to migrate:

var { graphql, buildSchema } = require("graphql")

// Construct a schema, using GraphQL schema language
var schema = buildSchema(`
  type Query {
    hello: String
  }
`)

// The rootValue provides a resolver function for each API endpoint
class Query {
  hello() {
    return "Hello world!"
  }
}

// Run the GraphQL query '{ hello }' and print out the response
graphql({
  schema,
  source: "{ hello }",
  rootValue: new Query(),
}).then(response => {
  console.log(JSON.stringify(response, null, 2))
})