Getting error deploying to Vercel : `Error: "Query" defined in resolvers, but not in schema`

I’m trying to deploy a slightly modified version of the Next.js official graphql-let example and I’m getting this error Error: "Query" defined in resolvers, but not in schema.

So I’ve looked into lib/schema.ts and when adding some logs:

import { join } from 'path'
import { makeExecutableSchema } from '@graphql-tools/schema'
import { loadFilesSync } from '@graphql-tools/load-files'
import { mergeTypeDefs } from '@graphql-tools/merge'
import graphQLLetConfig from '../../.graphql-let.yml'
import resolvers from './resolvers'

const loadedFiles = loadFilesSync(join(process.cwd(), graphQLLetConfig.schema))
const typeDefs = mergeTypeDefs(loadedFiles)

console.log(`Loaded files:`);
console.log(loadedFiles);
console.log(`Graphql-let config schema`);
console.log(graphQLLetConfig.schema);
console.log(`Path ${process.cwd()}`);
console.log(`Join: ${join(process.cwd(), graphQLLetConfig.schema)}`)

export const schema = makeExecutableSchema({
  typeDefs,
  resolvers,
})

I’m getting this:

Loaded files:
[]
Graphql-let config schema
**/*.graphqls
Path /var/task
Join: /var/task/**/*.graphqls

Loaded files seems to be empty. An issue was opened last year https://github.com/piglovesyou/graphql-let/issues/214 regarding this error with SSR config but I’m running a Static config.

[marklawlor]

loadFileSync requires the files to be present on the Vercel filesystem at runtime. By default Vercel will only include the built files. You need to update your Vercel configuration to tell it to include these files.

The other option is not to use loadFileSync and instead use Webpack to load the files at build time. This way they are included in the built output

import { join } from 'path'
import { makeExecutableSchema } from '@graphql-tools/schema'
import { loadFilesSync } from '@graphql-tools/load-files'
import { mergeTypeDefs } from '@graphql-tools/merge'
import graphQLLetConfig from '../../.graphql-let.yml'
import resolvers from './resolvers'

import schema1 from "./schema1.graphqls"
import schema2 from "./schema2.graphqls"

const typeDefs = mergeTypeDefs([
  schema1,
  schema2
])

export const schema = makeExecutableSchema({
  typeDefs,
  resolvers,
})

[marklawlor]

I would create a new issue for that and include a reproduce-able demo.