Unsupported type: never #620

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EladBezalel opened this issue May 19, 2025 · 0 comments

EladBezalel commented May 19, 2025

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:

Create a file with the following content:
```
export type Test = never;
```

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.

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