[BUG][Typescript] - Error information is deleted

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

When a request to an API encounters an error it will not have the information from the error because the library tries to parse it to the expected response. See the code below.

body = ObjectSerializer.deserialize(body, "UpdateSubmissionResponseContent");
if (response.statusCode && response.statusCode >= 200 && response.statusCode <= 299) {
    resolve({ response: response, body: body });
} else {
    reject(new HttpError(response, body, response.statusCode));
}

Ideally it should be something like:

if (response.statusCode && response.statusCode >= 200 && response.statusCode <= 299) {
    body = ObjectSerializer.deserialize(body, "UpdateSubmissionResponseContent");
    resolve({ response: response, body: body });
} else {
    reject(new HttpError(response, body, response.statusCode));
}

openapi-generator version

5.2.2

OpenAPI declaration file content or url

Not relevant

Generation Details

gradle swagger codegen

Steps to reproduce

1. Generate any API client
2. Make a request that gets a non 2xx response
3. Try to parse the error

Related issues/PRs

N/A

Suggest a fix

Move the deserialization of body to happen only on 2xx response

Start by locating the TypeScript client request flow that calls ObjectSerializer.deserialize with the expected response type. Reproduce a non-2xx response from a generated client and compare the error body before and after deserialization. Done means successful responses are still deserialized while HttpError receives the original error body.