graphqlSync breaks when upgrading to v16

[zachsa]

I am using graphqlSync to execute code against a schema on app startup. Upgrading from graphql@15 to graphql@16 (and no other changes) breaks my code.

import { makeExecutableSchema } from '@graphql-tools/schema'
import { graphqlSync, print } from 'graphql'
import { gql } from 'apollo-server-koa'

const schema = makeExecutableSchema({
  typeDefs: '...',
  resolvers: {...},
})

const query = print(
  gql`
      query {
        p: __type(name: "InputOne") {
          inputFields {
            name
            type {
              kind
            }
          }
        }
        m: __type(name: "InputTwo") {
          inputFields {
            name
            type {
              kind
            }
          }
        }
        a: __type(name: "InputThree") {
          inputFields {
            name
            type {
              kind
            }
          }
        }
      }
    `
)

console.log(schema) // Prints out a schema
console.log(query) // Prints out a query

const typeFields = graphqlSync( schema, query ).data

The above fails using graphql@16 with the following error:

/home/.../src/api/node_modules/graphql/type/schema.js:35
    throw new Error(
          ^

Error: Expected undefined to be a GraphQL schema.
    at assertSchema (/home/.../src/api/node_modules/graphql/type/schema.js:35:11)
    at validateSchema (/home/.../src/api/node_modules/graphql/type/validate.js:34:28)
    at graphqlImpl (/home/.../src/api/node_modules/graphql/graphql.js:52:64)
    at graphqlSync (/home/.../src/api/node_modules/graphql/graphql.js:31:18)
    at file:///home/.../src/graphql/schema/index.js:30:20
    at ModuleJob.run (node:internal/modules/esm/module_job:185:25)
    at async Promise.all (index 0)

[n1ru4l]

This is related to #2904

[zachsa]

Ah - thank you.

This works:

...

const typeFields = graphqlSync({ schema, source: query }).data