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"typescript-operations@2.2.1" + "avoidOptionals: true" generating "| undefined"

See original GitHub issue

Describe the bug Starting in typescript-operations@2.2.1, avoidOptionals: true is appending | undefined; The | undefined should not be present with avoidOptionals: true.

This was not happening in typescript-operations@2.2.0. In 2.2.0, the package correctly generates x | null.

To Reproduce Steps to reproduce the behavior:

Live example https://codesandbox.io/s/icy-browser-u7p8q?file=/codegen.yml:180-201

My GraphQL schema:

type Query {
    user(id: ID!): User!
}

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

My GraphQL operations:

query user {
    user(id: 1) {
        id
        username
        email
    }
}

My codegen.yml config file:

schema: schema.graphql
documents: document.graphql
generates:
  types.ts:
    config:
      avoidOptionals: true
    plugins:
      - typescript
      - typescript-operations

Expected behavior

Maybe types generate x | null, not x | null | undefined. Environment: