Is it possible to use inheritance with GraphQL input types?

No, GraphQL does not support inheritance with input types. Unlike object types in GraphQL, where you can define inheritance using interfaces or type extensions, input types do not support inheritance.

In GraphQL, input types are used specifically for passing input data to mutations and queries. They are meant to be simple, flat data structures without any complex relationships or inheritance.

For example, consider the following GraphQL schema:

type User {
  id: ID!
  name: String!
  email: String!
}

input CreateUserInput {
  name: String!
  email: String!
}

type Mutation {
  createUser(input: CreateUserInput!): User
}

In this example, we have a “User” object type and a “CreateUserInput” input type. The “CreateUserInput” input type defines the fields necessary to create a new user.

While it may be tempting to try and reuse the fields from the “User” object type for the “CreateUserInput” input type, GraphQL does not support inheritance for input types. Instead, you should define the fields explicitly within the input type.

If you have common input fields that you want to reuse in multiple input types, you can create separate input types and include them in other input types as needed. This approach allows you to keep the input types independent and simple while still achieving some level of code reuse.

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