no-substitute-to-SOLID.ts

interface GitProvider {
  download(): Code
}

class ProviderBase {
  endpoint: string
}

class GitHubProvider extends ProviderBase implements GitProvider {
  download() {}
}

class GitLabProvider extends ProviderBase implements GitProvider {
  download() {}
}


class CodeUser {
  constructor(private git: GitProvider) {
  }
  
  useCode() {
    const code = this.git.download()
  }
}