How to return value from callback in Graphql resolve function?

How do I return the value from callback function and pass it to resolve function in Graphql?

Here's the dummy code to show the concept:

This function runs the sql query:

function runQuery(query, cb){
   ....
   var value = "Something";
   cb(null, value);
}

This takes the value from callback function pass it to resolve function in graphql:

function getTitle() {
   return runQuery("...", function(err, value){ 
             return value; 
          });
}

Graphql schema:

var SampleType = new GraphQLObjectType({
  name: 'Sample',
  fields: () => ({
    title: { type: GraphQLString },
  }),
});


query: new GraphQLObjectType({
    name: 'Query',
    fields: () => ({
      sample: {
        type: SampleType,
        resolve: () => getTitle(),
      },
    }),
  }),

You can make use of promises and async to accomplish this.

async function getTitle() {
  const queryResult = await runQuery("...");

  // ...
  // Do post-query stuff here that you currently have in your callback
  // ...

  return queryResult
}

async function runQuery() {
  const value = 'something';
  // ...
  return value;
}

Node fully supports async/await as of 7.10.0. Use TypeScript or Babel if you're in the browser or are locked into a lower version of node.