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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?
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Root fields & resolvers At the top level of every GraphQL server is a type that represents all of the possible entry points into the GraphQL API, it's often called the Root type or the Query type. In this example, our Query type provides a field called human which accepts the argument id .
A GraphQL query is used to read or fetch values while a mutation is used to write or post values. In either case, the operation is a simple string that a GraphQL server can parse and respond to with data in a specific format. The popular response format that is usually used for mobile and web applications is JSON.
GraphQL schema says that this object should return 4 properties: id , date , specialist , client .
ID : The ID scalar type represents a unique identifier, often used to refetch an object or as the key for a cache. The ID type is serialized in the same way as a String; however, defining it as an ID signifies that it is not intended to be human‐readable.
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!';
}
}
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
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