Don't swallow all errors in graphql function

There seems to be no way to get errors out of graphql function and one only gets error title, which can be the dreaded undefined is not a function deep inside schema or resolve. Would be nice if there’d be a flag to let errors pass through from graphql function, when they are not validation errors. I’d be willing to implement it if this change makes sense.

Thanks!

[luchillo17]

Using formatError as well, is there a way to pass the same error handler when using in testing? (in tests you most of the time query directly using the graphql object to execute the query with the schema.

import {
  graphql,
} from 'graphql';
...
let resp = (await graphql(Schema, query, {}, context));

[tristanz]

This seems to be fixed here: https://github.com/graphql/express-graphql/pull/45/files

  graphiql: true,
  formatError: (error) => ({
    message: error.message,
    details: config.isProduction ? null : error.stack
  })