Bug: "type" keyword doesn't behave the same as TypeAlias

[atom-andrew]

Description

The "type" keyword just generates an empty schema in openapi.

URL to code causing the issue

No response

MCVE

# Your MCVE code here
import json
from typing import TypeAlias, Literal

from litestar import Controller, Litestar, get

AliasArg: TypeAlias = Literal[456]
type TypeArg = Literal[123]


class Test(Controller):
    @get(path="/test")
    async def test(self, alias_arg: AliasArg, type_arg: TypeArg) -> None:
        ...


if __name__ == "__main__":
    app = Litestar(
        route_handlers=[Test],
    )
    print(json.dumps(app.openapi_schema.to_schema(), indent=4))

Output looks like:

{
    "info": {
        "title": "Litestar API",
        "version": "1.0.0"
    },
    "openapi": "3.1.0",
    "servers": [
        {
            "url": "/"
        }
    ],
    "paths": {
        "/test": {
            "get": {
                "summary": "Test",
                "operationId": "TestTest",
                "parameters": [
                    {
                        "name": "alias_arg",
                        "in": "query",
                        "schema": {
                            "type": "integer",
                            "const": 456
                        },
                        "required": true,
                        "deprecated": false,
                        "allowEmptyValue": false,
                        "allowReserved": false
                    },
                    {
                        "name": "type_arg",
                        "in": "query",
                        "schema": {},
                        "required": true,
                        "deprecated": false,
                        "allowEmptyValue": false,
                        "allowReserved": false
                    }
                ],
                "responses": {
                    "200": {
                        "description": "Request fulfilled, document follows",
                        "headers": {}
                    },
                    "400": {
                        "description": "Bad request syntax or unsupported method",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "properties": {
                                        "status_code": {
                                            "type": "integer"
                                        },
                                        "detail": {
                                            "type": "string"
                                        },
                                        "extra": {
                                            "additionalProperties": {},
                                            "type": [
                                                "null",
                                                "object",
                                                "array"
                                            ]
                                        }
                                    },
                                    "type": "object",
                                    "required": [
                                        "detail",
                                        "status_code"
                                    ],
                                    "description": "Validation Exception",
                                    "examples": [
                                        {
                                            "status_code": 400,
                                            "detail": "Bad Request",
                                            "extra": {}
                                        }
                                    ]
                                }
                            }
                        }
                    }
                },
                "deprecated": false
            }
        }
    },
    "components": {
        "schemas": {}
    }
}

Steps to reproduce

1. Run example code
2. Inspect openapi output

Screenshots

"![SCREENSHOT_DESCRIPTION](SCREENSHOT_LINK.png)"

Logs

No response

Litestar Version

2.10.0

Platform

• Linux
• Mac
• Windows
• Other (Please specify in the description above)

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[github-actions]

This issue has been closed in #3715. The change will be included in the upcoming patch release.

[github-actions]

A fix for this issue has been released in v2.12.0