Unsupported type: never

[EladBezalel]

Describe the bug
When running typescript-json-schema on a TypeScript type alias that is set to never, the tool throws an error:

TypeError: Unsupported type: never
    at JsonSchemaGenerator.getDefinitionForRootType ...

To Reproduce
Steps to reproduce the behavior:

1. Create a file with the following content:

   export type Test = never;

2. Run:

   npx typescript-json-schema file.ts Test
   

Expected behavior
The tool should either:

• Generate a valid JSON schema for the never type (e.g., a schema that matches no values), or
• Gracefully report that never is not supported, without throwing an unhandled exception.
• When --ignoreErrors is passed, the tool should not crash and should continue processing.