[BUG] [typescript-angular] [5.4.0] - Wrong default response type 'blob' instead of JSON (OpenAPI model schema)

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?

OpenAPI-Generator-maven-plugin

Description

Generating a typescript-angular client with OpenAPI-Generator-maven-plugin 5.4.0
has wrong default response type 'blob' instead of the OpenAPI model schema.

-        let responseType_: 'text' | 'json' = 'json';
-        if(localVarHttpHeaderAcceptSelected && localVarHttpHeaderAcceptSelected.startsWith('text')) {
-            responseType_ = 'text';
+        let responseType_: 'text' | 'json' | 'blob' = 'json';
+        if (localVarHttpHeaderAcceptSelected) {
+            if (localVarHttpHeaderAcceptSelected.startsWith('text')) {
+                responseType_ = 'text';
+            } else if (this.configuration.isJsonMime(localVarHttpHeaderAcceptSelected)) {
+                responseType_ = 'json';
+            } else {
+                responseType_ = 'blob';
+            }
        }

Printing the response gives:

Blob
size: 161
type: "application/json"
[[Prototype]]: Blob
arrayBuffer: ƒ arrayBuffer()
size: (...)
slice: ƒ slice()
stream: ƒ stream()
text: ƒ text()
type: (...)
constructor: ƒ Blob()
Symbol(Symbol.toStringTag): "Blob"
get size: ƒ size()
get type: ƒ type()
[[Prototype]]: Object

instead of the actual object defined in the schemas.

openapi-generator version

5.4.0

OpenAPI declaration file content or url

responses:
        "200":
          description: OK
          content:
            */*:

instead of

responses:
        "200":
          description: OK
          content:
            application/json:

Generation Details

This is my pom.xml plugin config:

			<plugin>
				<groupId>org.openapitools</groupId>
				<artifactId>openapi-generator-maven-plugin</artifactId>
				<version>5.4.0</version>
				<executions>
					<execution>
						<id>angular</id>
						<goals>
							<goal>generate</goal>
						</goals>
						<configuration>
							<skip>false</skip>
							<skipIfSpecIsUnchanged>false</skipIfSpecIsUnchanged>
							<inputSpec>${project.basedir}/src/main/resources/api/API.yaml</inputSpec>
							<output>${project.basedir}/src/main/resources/api-client/ng-client</output>
							<generatorName>typescript-angular</generatorName>
							<configOptions>
								<npmName>@project/api-client</npmName>
								<npmVersion>1.0.0</npmVersion>
								<ngVersion>12.2.15</ngVersion>
								<apiModulePrefix>Project</apiModulePrefix>
							</configOptions>
						</configuration>
					</execution>
				</executions>
			</plugin>

Steps to reproduce

Related issues/PRs

Suggest a fix

The fix required the setting of this external application property, of SpringDoc, for generating the OpenApi yaml:

springdoc:
  default-produces-media-type: application/json

to override the default, which is

springdoc:
  default-produces-media-type: */*

Maybe the generated client should continue to default to JSON as the default httpHeaderAccepts even if the response content is */*.

Otherwise, this behaviour needs to be documented.

Start with the generated typescript-angular client’s responseType_ handling and the OpenAPI response content shown in the report, using the Maven plugin configuration to reproduce it. Compare behavior for / and application/json; done means JSON model responses are handled as intended, or the required behavior is clearly documented, with a regression check added if the project’s test entry point is found.