`--enum` flag doesn't convert empty string enums correctly

[ToadKing]

openapi-typescript version

7.13.0

Node.js version

26.1.0

OS + version

Linux

Description

If an enum has an empty string as an expected value, the generated TypeScript enum is invalid code since it tries to assign it to an empty label.

Reproduction

Run openapi-typescript --enum on this file:

{
    "openapi": "3.1.0",
    "info": {
        "title": "Test",
        "summary": "Test",
        "description": "Test",
        "version": "0.1.0",
        "license": {
            "name": "MIT",
            "identifier": "MIT"
        }
    },
    "servers": [
        {
            "url": "https://bexample.com"
        }
    ],
    "paths": {
        "/test": {
            "get": {
                "summary": "Test",
                "operationId": "test",
                "security": [
                    {}
                ],
                "parameters": [
                    {
                        "name": "type",
                        "in": "query",
                        "required": false,
                        "schema": {
                            "enum": [
                                "",
                                "foo",
                                "bar"
                            ],
                            "type": "string",
                            "default": "",
                            "title": "Type"
                        }
                    }
                ]
            }
        }
    }
}

Expected result

The enums generated are valid TypeScript. Get this instead:

export enum PathsTestGetParametersQueryType {
     = "",
    foo = "foo",
    bar = "bar"
}

Required

• My OpenAPI schema is valid and passes the Redocly validator (npx @redocly/cli@latest lint)

Extra

• I’m willing to open a PR (see CONTRIBUTING.md)