How do I specify a graphql type that takes multiple types?

I want to create a graphql type that can return either an Array of Integers or String.

I've already tried using union in the form union CustomVal = [Int] | String, but this returns an error.

The schema declaration is:

union CustomValues = [Int] | String type Data { name: String slug: String selected: Boolean values: CustomValues } 

The error is:

node_modules/graphql/error/syntaxError.js:24 return new _GraphQLError.GraphQLError('Syntax Error: ' + description, undefined, source, [position]); Syntax Error: Expected Name, found [ GraphQL request (81:23) 80: 81: union CustomValues = [Int] | String 

Is this possible to do in graphql? If not, can you please suggest an alternative to do this.

I ask this as the union documentation says that Note that members of a union type need to be concrete object types; you can't create a union type out of interfaces or other unions.

Any solutions would be highly helpful.

1 Answer

Follow this , Graphql does not support scaler union types currently, you can do this

union IntOrString = IntBox | StringBox type IntBox { value: Int } type StringBox { value: String } 

or you can have your custom type, see this graphql, union scalar type?