Apollo GraphQL Error: Query root type must be provided

Question

I have an Angular/Apollo GraphQL implementation generating typescript code based on GraphQl endpoint which is surfacing a schema. I can hit the endpoint via Postman with a query and results are returned. However, when I run "graphql-codegen --config codegen.yml" via npm I get this error:

"Error: Query root type must be provided"

The server side is .Net Core implementation using GraphQL ASPNetCore. I have 4 different queries defined and each one works via graphiql.

Any ideas on why query root type is now being returned as null?

Answer 1

GraphQL must have at least one @Query() to be considered valid. So maybe only need add any Query to your Resolver code will be helpful. Ex:

export class FooResolver {

  @Query(() => String)
  sayHello(): string {
    return 'Hello World!';
  }
}

Answer 2

This error throws when your schema stiching/definitions are incorrect. Please check the check your root schema definitions

https://www.advancedgraphql.com/content/schema-stitching