[typescript-angular] Incorrect serialization/deserialization for reserved words

Description

If your Swagger model has a reserved word, the typescript-angular generator will prefix it with an underscore. However, it appears that the client will not map the escaped version to the over-the-wire version when a service call is made.

In our specific example, we have a field in the JSON called class. The generated class has a property called _class, which is always undefined, because the class JSON property is not used to populate it.

Swagger-codegen version

2.3.0

Swagger declaration file content or url

Test:
  type: object
  properties:
    class:
      type: string
  required:
    - class

Produces:

export default class Test {
  _class: string;
}

Command line used for generation

java -jar /opt/swagger-codegen-cli/swagger-codegen-cli.jar generate -i ./swagger.yaml -l typescript-angular -o ./test-package --additional-properties ngVersion=5.0.0,npmName=test-package

Related issues/PRs

It is very similar to this Scala issue:
https://github.com/swagger-api/swagger-codegen/issues/6393

Suggest a fix/enhancement

I think we need to track what JSON property corresponds to what class property. When the client receives the JSON, it needs to populate the object correctly based on that map.

Reproduce the issue with the provided Swagger YAML and the typescript-angular generation command, then inspect the generated client's serialization and deserialization behavior. Trace how the JSON property class should correspond to the generated _class property; done means requests and responses preserve that mapping.