OpenApi 2.0 How to define return type byte[] (it will be zip data) using typescriprt

I have the following YAML:

/document/zip:
get:
produces:
- application/zip
tags:
- zipFileFolder
operationId: getRawDocumentFileZipData
parameters:
- in: body
name: args
required: true
schema:
type: array
items:
$ref: './definitions/model/document-metadata.yaml#/DocumentMetadata'
responses:
200:
description: The document file data as a zip file
schema:
type: string
format: binary
400:
description: bad input parameter


In case you may want to know the input type

DocumentMetadata:
type: object
required:
- id
- name
properties:
id:
type: number
fileName:
type: string


This generates the following API

public getRawDocumentFileZipData(args: Array<DocumentMetadata>, observe?: 'body', reportProgress?: boolean): Observable<string>;


As you can see it returns an Observable<string> What I need/want is it to return an Observable<Uint8Array> or Observable<ArrayBuffer>. Can someone please point me in the correct direction?

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