[BUG] [typescript-fetch] refuses to invoke if body is nullable and required

[tomsontom]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• 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

If the body parameter is required: true and nullable: true the generated code throws an error if one passes null

openapi-generator version

7.22-SNAPSHOT

OpenAPI declaration file content or url

{
  "openapi": "3.0.1",
	"info": {
		"title": "RSD Test",
		"version": "1.0.0"
  },
  "paths": {
	"/sample": {
      "post": {
        "tags": [
          "BodyParameterTypes"
        ],
        "description": "",
        "parameters": [],
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "type": "boolean",
                "nullable": true
              }
            }
          },
          "required": true
        },
        "responses": {
          "200": {
            "description": "",
            "content": {
              "application/json": {
                "schema": {
                    "type": "boolean"
                }
              }
            }
          }
        }
      }
    } 
  }
}

Generation Details

docker run --rm \ 
-v $PWD:/local openapitools/openapi-generator-cli:latest generate \
-i /local/openapi.json \
-g typescript-fetch --additional-properties=importFileExtension=.js \
-o /local/src

Steps to reproduce

• run the generator
• inspect the generated source / try to run it and invoke the method with null and you get a RequiredError thrown

If you inspect the source code you see

async samplePostRequestOpts(requestParameters: SamplePostRequest): Promise<runtime.RequestOpts> {
        if (requestParameters['body'] == null) {
            throw new runtime.RequiredError(
                'body',
                'Required parameter "body" was null or undefined when calling samplePost().'
            );
        }
...

which is obviously wrong as body can be null according to the spec above.

Related issues/PRs

Not that I'm aware of

Suggest a fix

The generator needs to check if the value in body can be null and then although it is required omit generating the above code.