[BUG][Typescript] Invalid oneOf

[ksvirkou-hubspot]

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

openapi-generator version

5.4.0

OpenAPI declaration file content or url

"inputFieldDependencies": {
    "type": "array",
    "description": "",
    "items": {
        "oneOf": [
            {
                "$ref": "#/components/schemas/SingleFieldDependency"
            },
            {
                "$ref": "#/components/schemas/ConditionalSingleFieldDependency"
            }
        ]
    }
}

Generation Details

generate -i *.json -g typescript -o /dir --skip-validate-spec --additional-properties usePromises=true,supportsES6=true,platform=node

Output

import { ConditionalSingleFieldDependency } from './ConditionalSingleFieldDependency';
import { SingleFieldDependency } from './SingleFieldDependency';
import { SingleFieldDependency | ConditionalSingleFieldDependency } from './SingleFieldDependency | ConditionalSingleFieldDependency';

It added incorrect import

Expected output

import { ConditionalSingleFieldDependency } from './ConditionalSingleFieldDependency';
import { SingleFieldDependency } from './SingleFieldDependency';

[ksvirkou-hubspot]

initial PR #9628