feat(fetch): include error types in data type of fetch response

[soartec-lab]

Status

READY

Description

fix #1588
The data type of the fetch response now includes the error type.

Context

When you have multiple response types schema like a below:

paths:
  /pets:
    get:
      summary: List all pets
      operationId: listPets
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Pets'
        '400':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BadRequest'

Before

So far, orval has only generated success type:

export type listPetsResponse = {
  data: Pets;
  status: number;
  headers: Headers;
};

After

From now on, it will generate a union that includes the error type

export type listPetsResponse = {
  data: Pets | BadRequest;
  status: number;
  headers: Headers;
};

Related PRs

none

Todos

• Tests
• Documentation
• Changelog Entry (unreleased)

Steps to Test or Reproduce

you can check by sample apps