[BUG] [JAVASCRIPT] Response type File no work

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• 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?
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Description

I am trying to download an xlsx file, generating the client api for a vuejs v2 project, but the autogenerated response type is not processed by the generated client api class

openapi-generator version

I have updated to the latest version of "@openapitools/openapi-generator-cli": "^2.5.2",

OpenAPI declaration file content or url

{
  "/custom-forecast/{hotelId}/excel":{
     "get":{
        "tags":[
           "Custom Forecast"
        ],
        "operationId":"getCustomForecastByHotelId",
        "parameters":[
           {
              "name":"hotelId",
              "in":"path",
              "required":true,
              "schema":{
                 "type":"integer",
                 "format":"int32"
              }
           }
        ],
        "responses":{
           "200":{
              "description":"OK",
              "content":{
                 "application/octet-stream":{
                    "schema":{
                       "type":"string",
                       "format":"binary"
                    }
                 }
              }
           }
        }
     },
     "put":{
        "tags":[
           "Custom Forecast"
        ],
        "operationId":"updateCustomForecastByHotelId",
        "parameters":[
           {
              "name":"hotelId",
              "in":"path",
              "required":true,
              "schema":{
                 "type":"integer",
                 "format":"int32"
              }
           }
        ],
        "requestBody":{
           "content":{
              "multipart/form-data":{
                 "schema":{
                    "required":[
                       "excel"
                    ],
                    "type":"object",
                    "properties":{
                       "excel":{
                          "type":"string",
                          "format":"binary"
                       }
                    }
                 }
              }
           }
        },
        "responses":{
           "200":{
              "description":"OK"
           }
        }
     }
  }
}

Generation Details

To generate the code, run the following command
node node_modules/@openapitools/openapi-generator-cli/main.js generate -i openapi.json -o src/openapi/ -g javascript -c openapi-generator-config.json

Steps to reproduce

the previous command generates the api class to call back the method to obtain the file declares that the response type is a File type

the only statement i could find is the one shown below that extends blob

when I execute the call it ends up calling the ApiClient class

In this class, nothing is done with the return type defined and it delegates the transformation of the response to the deserialize method.

but this engine is unable to infer the type and ends up returning the response.text

Suggest a fix

I understand that if the code generator says that the return type is a file, take that into account, or allow for the expected type as an optional parameter when generating the calling method.

Start with the generated JavaScript ApiClient and its deserialize method, using the supplied OpenAPI declaration and the generation command to reproduce the response handling. Trace the application/octet-stream response for the binary string schema and compare it with the generated File type. Done means the generated client returns the downloaded file data instead of response.text.