[Swift] Obsoleted PromiseKit generated

Description

Swift 5 Codegen generates an obsoleted Code with the "PromiseKit" option enabled in the "responseAs" field inside generate-config.json

Version

I used "swagger-codegen-cli-2.4.10" with "-l swift 5" option.
XCode 11.2

Issue examples

After Pods installation, Xcode returns a few errors in Pod library (inside Pods/PromiseKit/UIKit) like this:

/UIKit.UIViewAnimationOptions:3:18: 'UIViewAnimationOptions' was obsoleted in Swift 4.2

(Works):

public class func promise(animateWithDuration duration: TimeInterval, delay: TimeInterval = 0, options: UIView.AnimationOptions = [], animations: @escaping () -> Void) -> Promise<Bool> {
        return PromiseKit.wrap { animate(withDuration: duration, delay: delay, options: options, animations: animations, completion: $0) }
    }

(Returns error):

public class func promise(animateWithDuration duration: TimeInterval, delay: TimeInterval = 0, options: UIViewAnimationOptions = [], animations: @escaping () -> Void) -> Promise<Bool> {
        return PromiseKit.wrap { animate(withDuration: duration, delay: delay, options: options, animations: animations, completion: $0) }
    }

(Screenshot):

Command line used for generation

java -jar swagger-cli/swagger-codegen-cli-2.4.10.jar generate -l swift5 -o SomeLibrary/ -i swagger.json -c generate-config.json

generate-config.json content:

{
 "projectName": "SomeLibrary",
 "podDescription": "Implements SomeLibrary using PromiseKit",
 "podSummary": "SomeLibrary",
 "podHomepage": "SomeLibraryHomepage.com",
 "podAuthors": "Sergey Shoshin",
 "podVersion": "1.1.0",
 "responseAs": "PromiseKit"
}

Steps to reproduce

• Add PromiseKit option to responseAs
• Generate Library
• Make "Pod install"
• Open XCode project & build

Related issues/PRs

• Swift 5 Support: #9386
• PromiseKit Update: #9229
• PromiseKit Update: #8481

Possible reason

It generates .podspec file with obsoleted PromiseKit, I think that this is the reason and suggest to update it to the latest PromiseKit 6 (at least for Swift 5).

From:

s.dependency 'PromiseKit/CorePromise', '~> 4.4.0'
s.dependency 'Alamofire', '~> 4.9.0'

To:

s.dependency 'PromiseKit', '~> 6.8'
s.dependency 'Alamofire', '~> 4.9.0'

But then need to change fulfill & reject part a little.

(Issue):

Value of tuple type '(promise: Promise<Response>, resolver: Resolver<Response>)' has no member 'fulfill'
Value of tuple type '(promise: Promise<Response>, resolver: Resolver<Response>)' has no member 'reject'

(Screenshot):

To fix it need just add the ".resolver" field.

From:
deferred.reject(error)
To:
deferred.resolver.reject(error)

Like that:

By the way, PromisKit has the Guideline for moving: https://mxcl.dev/PromiseKit/news/2018/02/PromiseKit-6.0-Released/

Start with the supplied generate-config.json and the Swift 5 output from the provided swagger-codegen command, especially the generated .podspec and PromiseKit calls. Compare the PromiseKit dependency and resolver usage with the reported Swift 5 errors; done means a generated library installs and builds in Xcode without obsolete API or fulfill/reject errors.