Bug Report Checklist

• 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

The following schema generates a JavaScript Set property:

{
  "Test": {
    "required": [
      "a"
    ],
    "type": "object",
    "properties": {
      "a": {
        "uniqueItems": true,
        "type": "array",
        "items": {
          "type": "string"
        }
      }
    }
  }
}

Generated object:

export interface Test {
    /**
     * 
     * @type {Set<string>}
     * @memberof Test
     */
    'a': Set<string>;
}

However when sending this request to the server, the value is not de-serialized as an array but just replaced with an empty object ("a":{}).

Similarly, when inspecting the returned data from an API, the actual values on the JavaScript object are not wrapped in a set, but return as an array.

openapi-generator version

4.5.0

Suggest a fix

Either don't generate Set and use a T[] or add conversions for sending and receiving sets