Impossible to create Dart client with Github spec

Created by: chemaxa

Description

Hi. I am tried to use OpenApitools and https://editor.swagger.io/ online generators for build dart github api client, but no one of them cant build working code.

openapi-generator version

5.0.0-beta2

OpenAPI declaration file content or url

https://github.com/github/rest-api-description/tree/main/descriptions/api.github.com

Command line used for generation

I tried using online generator on https://editor.swagger.io/, just put URL on github json spec file and select DART in dropdown menu.

After that i also try to use openapi tools generator and download jar and used command from https://github.com/OpenAPITools/openapi-generator/wiki/API-client-generator-HOWTO

java -jar .\openapi-generator-cli-5.0.0-beta2.jar generate -i .\openapi.json -g dart -o .\dart-client

Where openapi.json file i getting from https://github.com/github/rest-api-description/tree/main/descriptions/api.github.com

Steps to reproduce

Just try to build client from github swagger.json, and open code editor, after analyze is finished dart compiler will show all issues with generated code.